scholarly journals MODELAGEM PRÉ-COLHEITA DA ESTRUTURA DIAMÉTRICA DE PLANTIOS DE Pinus spp. POR MEIO DE DISTRIBUIÇÕES PROBABILÍSTICAS

FLORESTA ◽  
2012 ◽  
Vol 42 (2) ◽  
pp. 381
Author(s):  
Fernando Da Silva
Keyword(s):  
Method Of Moments ◽  
Least Squares Method ◽  
Timber Harvesting ◽  
Diameter Class ◽  
Chi Square ◽  
Method Of Maximum Likelihood ◽  
Moments Method ◽  
Log Normal ◽  
Pinus Spp

 O objetivo foi estudar o comportamento das curvas de distribuição diamétrica de plantios de Pinus spp. no município de Palmas, PR. Os dados são de um povoamento de 87 ha, com 18 anos de idade. As funções probabilísticas Normal, Log-normal, Gamma, Beta, SB de Johnson, Weibull 2P, Weibull 3P e Weber foram ajustadas, utilizando-se para estimativa dos parâmetros o Método dos Momentos, o Método da Máxima Verossimilhança e o Método de Mínimos Quadrados. A qualidade dos ajustes das distribuições foi avaliada por meio do teste de χ2, adotando 5% de probabilidade e o desvio relativo entre as somas observada e estimada dos diâmetros. Verificou-se a sobreposição das curvas em algumas classes, não sendo possível discriminar qual a melhor distribuição somente observando os histogramas. As curvas foram comparadas analiticamente pelo teste de qui-quadrado (χ2), que revelou diferenças significativas entre as curvas observada e estimada. Procedeu-se à análise dos desvios relativos entre as somas observada e estimada dos diâmetros, apenas para as funções que se mostraram aderentes no teste de χ2. Dentre as funções testadas, Weibull 3P apresentou o melhor desempenho, sendo, portanto, recomendada para a estimar o número de árvores por hectare e por classe diamétrica na região do estudo.Palavras-chave: Manejo florestal; colheita de madeira; modelagem. AbstractPre harvesting modeling of the diametric structure in stands of Pinus spp. using probability density functions. The objective was to study the behavior of the distribution curves diamétric of plantations Pinus spp. in the municipality of Palmas - PR. Data are from a stand of 87 ha, with 18 years of age. The probability functions Normal, Log-normal, Gamma, Beta, Johnson SB, Weibull 2P, 3P Weibull and Weber were adjusted to estimate parameters using the Method of Moments, Method of maximum likelihood and least squares method. The quality of the fits of the distributions was assessed using the χ2 test, with 5% probability and the relative deviation between the observed and estimated sums of the diameters. There was overlap of the curves in some classes, it was not possible to discriminate the best distribution only observing the histograms. The analytical curves were compared using the chi-square (χ2), which revealed significant differences between the observed and estimated curves. There has been analysis of the relative deviations between the observed and estimated sums of the diameters, only for the functions that were adherent in the χ2 test. Among the functions tested, the Weibull 3P function showed the best performance and was recommended to estimate the number of trees per hectare by diameter class in the study region.Keywords: Forest management; timber harvesting; modeling. 

scholarly journals On the Adequacy of Some Low-Order Moments Method to Simulate Certain Particle Removal Processes

2021 ◽  
Vol 5 (4) ◽  
pp. 46
Author(s):  
Margaritis Kostoglou ◽  
Thodoris D. Karapantsios
Keyword(s):  
Method Of Moments ◽  
Degrees Of Freedom ◽  
Normal Approximation ◽  
Particle Removal ◽  
The Past ◽  
Moments Method ◽  
Removal Processes ◽  
Indispensable Tool ◽  
Log Normal ◽  
Colloid Systems

The population balance is an indispensable tool for studying colloidal, aerosol, and, in general, particulate systems. The need to incorporate spatial variation (imposed by flow) to it invokes the reduction of its complexity and degrees of freedom. It has been shown in the past that the method of moments and, in particular, the log-normal approximation can serve this purpose for certain phenomena and mechanisms. However, it is not adequate to treat gravitational deposition. In the present work, the ability of the particular method to treat diffusional and convective diffusional depositions relevant to colloid systems is studied in detail.

scholarly journals Probability distribution of heavy rainfall and determination of IDF in the city of Caruaru – PE

2021 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Kevin Matheus Correia Mendes ◽  
Aline Lima de Oliveira ◽  
Lucas Ravellys Pyrrho de Alcântara ◽  
Adriana Thays Araújo Alves ◽  
Severino Martins dos Santos Neto ◽  
...  
Keyword(s):  
Quality Parameters ◽  
Likelihood Method ◽  
Chi Square ◽  
Kolmogorov Smirnov ◽  
Anderson Darling ◽  
The Moment ◽  
Log Normal ◽  
The City

In the design of hydraulic engineering works, the estimation of project precipitation is fundamental. Rain forecasting depends on several factors, which makes estimating it simpler with stochastic processes. In this sense, the distributions of Gumbel (GUM), Log-Normal two-parameter (LN2P), Generalized Extreme Value (GEV), Fréchet with two and three parameters (FRE2P and FRE3P), Weibull with two and three parameters (W2P and W3P), Gamma (GAM2P), and Pareto with two and three parameters (PAR2P and PAR3P) were evaluated to the annual maximum daily precipitation (AMDP) adjustment in the city of Caruaru (Pernambuco´s Agreste). A series of AMDP was used, based on data obtained from the National Water Agency (Agência Nacional de Águas - ANA). Anderson Darling (AD), Kolmogorov-Smirnov (KS) and Pearson Chi-square (χ2) adherence tests, and the determination coefficient (R²) were used to assess the adherence quality of the distributions. The Likelihood Method presented a better fit quality than the Moment Method. The GEV distribution obtained the best results for the AD test in both methods to estimate the parameters. Among the adherence tests used, the AD test was considered the most restrictive. To verify the quality parameters’ fitness to the IDF relations, the Willmott performance coefficient was used. For all distributions employed in this study, Willmott performance coefficients presented values above 0.99, giving a perfect fit of IDF relations with determination coefficients close to 1.0.

HUBUNGAN PERAN FAMILY CAREGIVER TERHADAP QUALITAS HIDUP LANSIA

2019 ◽  
Vol 11 (1) ◽  
pp. 51-56
Author(s):  
RIANI PRADARA JATI ◽  
Sekar Farah Nabila
Keyword(s):  
Quality Of Life ◽  
Family Caregiver ◽  
Random Sampling ◽  
Simple Random Sampling ◽  
The Elderly ◽  
Chi Square ◽  
The Poor ◽  
The Family

  Penempatan peran yang baik bagi Family Caregiver sangatlah membantu lansia dalam meningkatkah qualitas hidupnya, meningkatkan motivasi dalam menjalankan hidup Penelitian ini bertujuan Mengetahui hubungan peran Family Caregiver dalam pemenuhan qualitas hidup bagi lansia di Kelurahan Langenharjo Kabupaten Kendal. DesainPenelitianDeskriptifKorelasional menggunakan pendekatan Krosectional,tehnikSamplingStratified Simple Random Sampling dengan karakteristik heterogen, dari populasi mempunyai hak yang sama untuk diseleksi sebagai sampel teknik undianPengambilan data dengan menggunakan kuesioner yang telah diuji validitas dan reliabilitasnya. Uji statistik Chi-square, dengan taraf signifikasi 5%jumlah sampel pada penelitian ini 70 sampel pada Family Caregiver dari 213 populasi yang ada. Hasil penelitian dari 70 responden didapatkan Peran Family Caregiver tidak baik dengan qualitas hidup tidak baik 33 (47,1%), sedangkan Peran Family Caregiver kurang baik dengan qualitas hidup lansia baik 3 (4,3%). Untuk distribusi Peran Family Caregiver kurang baik dengan qualitas hidup lansia tidak baik sebanyak 6 responden (8,6%) sedangkan untuk distribusi Peran Family Caregiver kurang baik dengan qualitas hidup lansia baik sebanyak 23 responden (32,9%). Terakhir, untuk distribusi Peran Family Caregiver baik dengan qualitas hidup lansia tidak baik didapatkan hasil 2 responden (2, 9%) sedangkan untuk distribusi Peran Family Caregiver baik dengan qualitas hidup lansia baik didapatkan hasil 3 responden (4,3%)Menunjukkan nilai ρ value 0,001 (ρ < 0,05) berarti ada hubungan antara dukungan keluarga dengan kepatuhan lansia dalam keikutsertaan posyandu lansia. Disarankan kepada semua Family Cregiver lansia untuk mampu memahami pentingnya perhatian, dukungan bagi lansia dalammeningkatkan qualitas hidup yang lebih baik bagi lansia.   Kata kunci : Peran family caregiver, qualitas hidup, lansia.   ABSTRACT Placement of a good role for Family Caregiver is very helpful for the elderly to improve their quality of life, increase motivation in living life Research Objective: To know the relationship between the role of Family Caregiver in fulfilling quality of life for the elderly in Langenharjo Village, Kendal Regency. Descriptive Correlational Research Design uses a cross sectional approach, Sampling Stratified Simple Random Sampling technique with heterogeneous characteristics, from the population has the same right to be selected as a sample lottery technique Retrieving data using a questionnaire that has been tested for validity and reliability. Test Chi-square statistics, with a significance level of 5% the number of samples in this study 70 samples on the Family Caregiver from 213 populations. Results of the Study Of 70 respondents found the role of Family Caregiver was not good with poor quality of life 33 (47.1%) , while the role of the Family Caregiver is not good with the quality of life of a good elderly 3 (4.3%). For the distribution of the role of Family Caregiver is not good with the quality of life of the poor family as many as 6 respondents (8.6%) while for the distribution of the Role of Family Caregiver is not good with the quality of life of good elderly as many as 23 respondents (32.9%). Finally, the distribution of the Role of Family Caregiver with good quality of life for the poor is obtained by 2 respondents (2, 9%), while the distribution of the Role of Family Caregiver with good quality of life for the elderly is obtained by 3 respondents (4.3%). 0.001 (ρ <0.05) means that there is a relationship between family support and the compliance of the elderly in the participation of the elderly posyandu. It is recommended to all elderly Cregiver families to be able to understand the importance of attention, support for the elderly in improving the quality of life better for the elderly   Keywords: Role of Family Caregiver, Quality of Life, Elderly

Prediction of Haemoglobin Level by Some Probability Distribution

2020 ◽  
Vol 9 (1) ◽  
pp. 84-88
Author(s):  
Govinda Prasad Dhungana ◽  
Laxmi Prasad Sapkota
Keyword(s):  
Probability Distribution ◽  
Normal Distribution ◽  
Goodness Of Fit ◽  
Continuous Variable ◽  
Hemoglobin Level ◽  
Chi Square ◽  
Chi Square Test ◽  
Log Normal ◽  
Two Parameters ◽  
Best Fit

 Hemoglobin level is a continuous variable. So, it follows some theoretical probability distribution Normal, Log-normal, Gamma and Weibull distribution having two parameters. There is low variation in observed and expected frequency of Normal distribution in bar diagram. Similarly, calculated value of chi-square test (goodness of fit) is observed which is lower in Normal distribution. Furthermore, plot of PDFof Normal distribution covers larger area of histogram than all of other distribution. Hence Normal distribution is the best fit to predict the hemoglobin level in future.

Use of SAMe-TT₂R₂ Score to Predict the Quality of Anticoagulation Control in Patients with Atrial Fibrillation Receiving Warfarin in Thailand

2020 ◽  
Vol 103 (6) ◽  
pp. 548-552
Keyword(s):  
Atrial Fibrillation ◽  
Therapeutic Range ◽  
Statistical Significance ◽  
Discrimination Performance ◽  
Poor Quality ◽  
Chi Square ◽  
Exact Test ◽  
Time In Therapeutic Range ◽  
Anticoagulation Control

Objective: To predict the quality of anticoagulation control in patients with atrial fibrillation (AF) receiving warfarin in Thailand. Materials and Methods: The present study retrospectively recruited Thai AF patients receiving warfarin for three months or longer between June 2012 and December 2017 in Central Chest Institute of Thailand. The patients were classified into those with SAMe-TT₂R₂ of 2 or less, and 3 or more. The Chi-square test or Fisher’s exact test was used to compare the proportion of the patients with poor time in therapeutic range (TTR) between the two groups of SAMe-TT₂R₂ score. The discrimination performance of SAMe-TT₂R₂ score was demonstrated with c-statistics. Results: Ninety AF patients were enrolled. An average age was 69.89±10.04 years. Most patients were persistent AF. An average CHA₂DS₂-VASc, SAMe-TT₂R₂, and HAS-BLED score were 3.68±1.51, 3.26±0.88, and 1.98±0.85, respectively. The present study showed the increased proportion of AF patients with poor TTR with higher SAMe-TT₂R₂ score. The AF patients with SAMe-TT₂R₂ score of 3 or more had a larger proportion of patients with poor TTR than those with SAMe-TT₂R₂ score of 2 or less with statistical significance when TTR was below 70% (p=0.03) and 65% (p=0.04), respectively. The discrimination performance of SAMe-TT₂R₂ score was demonstrated with c-statistics of 0.60, 0.59, and 0.55 when TTR was below 70%, 65% and 60%, respectively. Conclusion: Thai AF patients receiving warfarin had a larger proportion of patients with poor TTR when the SAMe-TT₂R₂ score was higher. The score of 3 or more could predict poor quality of anticoagulation control in those patients. Keywords: Time in therapeutic range, Poor quality of anticoagulation control, Warfarin, SAMe-TT₂R₂, Labile INR

scholarly journals Using Benford’s law to assess the quality of COVID-19 register data in Brazil

2020 ◽  
Author(s):  
Lucas Silva ◽  
Dalson Figueiredo Filho
Keyword(s):  
Goodness Of Fit ◽  
Epidemiological Surveillance ◽  
Evidence Based ◽  
Mean Absolute Deviation ◽  
Chi Square ◽  
Absolute Deviation ◽  
Distortion Factor ◽  
Benford Law ◽  
Official Data

Abstract We employ Newcomb–Benford law (NBL) to evaluate the reliability of COVID-19 figures in Brazil. Using official data from February 25 to September 15, we apply a first digit test for a national aggregate dataset of total cases and cumulative deaths. We find strong evidence that Brazilian reports do not conform to the NBL theoretical expectations. These results are robust to different goodness of fit (chi-square, mean absolute deviation and distortion factor) and data sources (John Hopkins University and Our World in Data). Despite the growing appreciation for evidence-based-policymaking, which requires valid and reliable data, we show that the Brazilian epidemiological surveillance system fails to provide trustful data under the NBL assumption on the COVID-19 epidemic.

scholarly journals 49 A Quality Improvement Project to Assess and Refine the Handover Process at Morning Trauma Meetings

2021 ◽  
Vol 108 (Supplement_2) ◽  
Author(s):  
S Sadiq ◽  
M Tahir ◽  
I Nur ◽  
S Elerian ◽  
A Malik
Keyword(s):  
Categorical Variables ◽  
Next Of Kin ◽  
Chi Square ◽  
Neck Of Femur ◽  
Improvement Project ◽  
Handover Process ◽  
Neck Of Femur Fracture ◽  
The Impact ◽  
Standard Operating Protocol

Abstract Introduction Poor handover between shifts can result in patient harm. This study was designed to evaluate the impact of implementing a handover protocol on the quality of information exchanged in the trauma handover meetings in a UK hospital. Method A prospective single-centre observational study was performed at an NHS Trust. Ten consecutive weekday trauma meetings, involving 43 patients, were observed to identify poor practices in handover. This data was used in conjunction with the Royal College of Surgeons’ recommendations for effective handover (2007) to create and implement a standard operating protocol (SOP). Following its implementation, a further 8 consecutive meetings, involving a further 47 patients, were observed. The data was analysed using t-test for quantitative variables and chi-square or Fisher’s exact tests for categorical variables. Results An improvement was demonstrated in multiple aspects of trauma handover including past medical history, injury date, results, diagnosis, consent, mark, and starvation status (all p &lt; 0.001). Subgroup analyses showed that handover of neck-of-femur fracture patients including information on baseline mobility (p = 0.04), Nottingham-Hip-Fracture Score (p = 0.01), next-of-kin discussion (p = 0.075) and resuscitation status (p = 0.001) all improved following the intervention. Conclusions These results demonstrate that the implementation of a well-structured handover protocol can improve the transmission of critical information in trauma meetings.

The study of Iranian children and adolescents’ physical activity: a systematic review and meta-analysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Adel Alizadeh ◽  
Reza Negarandeh ◽  
Fahimehe Bagheri Amiri ◽  
Zahra Yazdani
Keyword(s):  
Physical Activity ◽  
Children And Adolescents ◽  
Meta Analysis ◽  
World Health ◽  
Chi Square ◽  
The Status ◽  
Newcastle Ottawa Scale ◽  
Health Organization ◽  
Iranian Children

Abstract Objectives This systematic and meta-analysis review was conducted to determine the status of Iranian children and adolescents’ physical activity. Content All the related articles which were published in the major databases, including Pubmed, Scopus, Web of Science, Embase, Magiran, SID from the beginning of 2010 to the end of 2019, were reviewed by researchers. The Newcastle-Ottawa scale was also used to evaluate the quality of articles. Moreover, I 2 index and chi-square were used to assess the heterogeneity between the results. Summary 490 articles were found as a result of the search in the selected international and local databases, where finally, 10 articles were included into the meta-analysis after the elimination of the duplicated articles and applying inclusion and exclusion criteria. The results indicated that 29.5% of the girls were considered active according to WHO criteria (16.1–42.8: 95% CI) and also 20.5% of the boys (7.3–33.7: 95% CI). Outlook Overall, this study’s findings showed that a large percentage of Iranian children and adolescents do not achieve the level of physical activity recommended by the World Health Organization. This can lead to undesirable consequences for this group of population that is considered as the human capital of any country; consequently, it seems necessary to take basic measures at the micro and macro levels in order to reduce such problems in the society.

Effect of Augmentative Technology on Communication and Quality of Life After Tracheostomy or Total Laryngectomy

2021 ◽  
pp. 019459982110137
Author(s):  
Catherine T. Haring ◽  
Janice L. Farlow ◽  
Marie Leginza ◽  
Kaitlin Vance ◽  
Anna Blakely ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Total Laryngectomy ◽  
Electronic Communication ◽  
Well Being ◽  
Chi Square ◽  
Communication Device ◽  
Patient Reported ◽  
Communication Devices ◽  
Related Quality

Objective Surgical procedures that render patients acutely aphonic can cause them to experience significant anxiety and distress. We queried patient perceptions after tracheostomy or laryngectomy and investigated whether introducing augmentative technology was associated with improvement in patient-reported outcomes. Methods Participants included hospitalized patients who acutely lost the ability to speak due to tracheostomy or total laryngectomy from April 2018 to December 2019. We distributed questions regarding the patient communication experience and relevant questions from the validated V-RQOL questionnaire (Voice-Related Quality of Life). Patients were offered a tablet with the electronic communication application Verbally. Pre- and postintervention groups were compared with chi-square analyses. Results Surveys were completed by 35 patients (n = 18, preintervention; n = 17, postintervention). Prior to using augmentative technology, 89% of patients who were aphonic reported difficulty communicating, specifically noting breathing or suctioning (56%), treatment and discharge plans (78%), or immediate needs, such as pain and using the bathroom (39%). Communication difficulties caused anxiety (55%), depression (44%), or frustration (62%), and 92% of patients were interested in using an electronic communication device. Patients reported less trouble communicating after the intervention versus before (53% vs 89%, P = .03), including less difficulty communicating about treatment or discharge plans (35% vs 78%, P < .01). V-RQOL scores were unchanged. Discussion Acute loss of phonation arising from surgery can be highly distressing for patients, and use of augmentative technology may alleviate some of these challenges by improving communication. Further studies are needed to identify what additional strategies may improve overall well-being. Implications for Practice Electronic communication devices may benefit patients with acute aphonia.

scholarly journals Addition of sucrose on cryoprotectant solution of vitrification enhances the quality of Dorper sheep embryos produced in vivo

2015 ◽  
Vol 36 (6Supl2) ◽  
pp. 4257
Author(s):  
Alane Pains Oliveira do Monte ◽  
João Bosco Loiola Filho ◽  
Thais Thatiane Dos Santos Souza ◽  
Mayara De Souza Miranda ◽  
Lívia Correia Magalhães ◽  
...  
Keyword(s):  
Embryo Quality ◽  
Control Group ◽  
Chi Square ◽  
Mass Occurrence ◽  
Chi Square Test ◽  
Vitrification Solution ◽  
Cryoprotectant Solution ◽  
Pellucid Zone

<p>This study aimed to evaluate the efficacy of adding sucrose in vitrification solution of ovine embryos produced <em>in vivo</em>. Forty Dorper ewes were selected and superovulated. Immediately prior to the embryo collection by laparotomy, a laparoscopy was performed to verify the superovulatory response. The recovered flushing was followed by embryo evaluation and embryos were divided in two experimental groups where embryos from Control group were submitted to a traditional vitrification protocol and embryos from Sucrose group to a modified vitrification protocol with sucrose. After warming, embryos were again divided regarding cryoprotectant removal (Indirect) or not (Direct). The embryo quality was classified as embryos of degrees I (excellent or good), II (regular), III (poor) and IV (dead or degenerate). It was also verified the homogeneity of mass, occurrence of embryonic mass retraction and rupture of pellucid zone. The results were expressed as percentages and were subjected to Chi-square test with P &lt; 0.05. The embryos vitrified in the presence of sucrose had lower proportions of lower-quality embryos after warming (22.20 vs. 44.50%), higher percentages of homogeneous embryos after warming (63.89 vs. 38.89 %) while concerning other parameters there was no difference between these groups. It can be concluded that the addition of 0.4 M sucrose during vitrification improves the embryo quality.</p>

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