scholarly journals Aesthetic Value of the Relationship between the Shapes of the Face and Permanent Upper Central Incisor

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Felipe de Oliveira Farias ◽  
Jussara P. Ennes ◽  
José Roberto Zorzatto
Keyword(s):  
Statistical Analysis ◽  
Correlation Coefficient ◽  
Central Incisor ◽  
Aesthetic Value ◽  
Pearson’S Correlation Coefficient ◽  
Kappa Test ◽  
The Face ◽  
Pearson's Correlation ◽  
Metrical Analysis ◽  
The Relationship

The relationship between the shapes of face and teeth has been analyzed for esthetic purposes and exploited commercially. The methodology to assess this correlation, described in the literature, does not enable reliable application of the concepts. Digital photos of face and incisors of 100 youths were measured with the software Image Tool 3.0 and classified as to shape. The same photographs were also analyzed and classified by a visual criterion. Statistical analysis of the metrical classification was performed by Pearson's correlation coefficient. The Kappa test was used to determine the coefficient of agreement between the observers and the obtained data, and to assess the agreement between both classifications (metrical and visual). The classificatory analysis made by the observers indicated a marked level of disagreement, also identified between their classification and that obtained by metrical analysis. The results indicated no relationship between the shapes of the face and the central incisor.

scholarly journals Evaluation of Relation between Bizygomatic Width and Mesiodistal Dimension of Maxillary Central Incisor in Saudi Population: An In-vivo Study

2020 ◽  
Author(s):  
Mohammed Shammas ◽  
Eyad Osama Bukhari ◽  
Albatool Jaffar Rummani ◽  
Ahmed Ali Almasri ◽  
Deema Essam Bakhsh ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
P Value ◽  
Saudi Population ◽  
Central Incisor ◽  
Pearson’S Correlation Coefficient ◽  
Maxillary Central Incisor ◽  
Pearson's Correlation ◽  
Males And Females ◽  
Pearson's Correlation Coefficient ◽  
The Relationship

Introduction: Selection of the maxillary anterior teeth is one of the most crucial steps in fabricating a removable prosthesis. To overcome this challenge, the relationship between facial measurements and natural teeth could be used as a guide in selecting the Maxillary Central Incisor (MCI) teeth. To improve aesthetics, various efforts have been made to associate the Mesiodistal Dimension (MD) of the MCI with various facial parameters. Aim: To determine the relationship between Bizygomatic Width (BZW) and the MD of the MCI in the Saudi population. Materials and Methods: The cross-sectional study selected two hundred dentulous subjects (100 males and 100 females) using a simple random sampling technique from December 2019 to March 2020. BZW was measured between the two most prominent points on the zygomatic bone, and the MD of the MCI was measured between the interproximal contact points. Both measurements were made with the help of a digital vernier caliper. Descriptive statistics and student’s t-test were used to compare all the measurements between males and females with a level of significance at 5% (0.05) and the power of the study of 95%. Pearson’s correlation coefficient (r) was used to find the interconnection between MD of MCI and BZW by linear correlation analysis. Results: The average values for BZW for males and females were found to be 123.56±3.74 mm and 117.33±3.21 mm, respectively. The average MD values of MCI for males and females were found to be 8.6±0.46 mm and 8.4±0.53 mm, respectively. A statistically significant difference was observed in the mean values of the BZW (p-value<0.001) and MD of MCI (p-value 0.002) when a comparison was done among males and females. The average ratio of MD of MCI to BZW was found to be 0.07±0.004 for males, whereas it was 0.072±0.004 for females and was statistically significant (p-value 0.001). The ratio of MD of MCI to BZW was found to be 1:14 for males and females. Pearson’s correlation coefficient (r) was positive and ranged from 0.067 to 0.007. Conclusion: Males had greater values for BZW and MD of MCI than females. There was an inconsistency when Berry’s biometric ratio was applied and when compared with the actual MD of MCI measurement in the present study. The findings of this study showed that there was a weak positive correlation between the MD of MCI and the BZW.

Possibilities of Positive Psychotherapy in the Formation of Hardiness

2021 ◽  
Vol 1 (2) ◽  
pp. 22-26
Author(s):  
Olena Chykhantsova ◽  
Olga Kuprieieva
Keyword(s):  
Regression Analysis ◽  
Family Therapy ◽  
Correlation Coefficient ◽  
Prognostic Indicators ◽  
Statistical Relationship ◽  
Positive Psychotherapy ◽  
Pearson’S Correlation Coefficient ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient ◽  
The Relationship

rapy in the formation of hardiness and to delve deeper into the relationship between hardiness and actual capabilities of the person. Data were collected from 380 people from Ukraine, aged between 19 and 62. The respondents completed the Wiesbaden Inventory for Positive Psychotherapy and Family Therapy (WIPPF 2.0), which was developed by N. Peseschkian in collaboration with H. Deidenbach and the Maddi Hardiness Scale. We used Pearson’s correlation coefficient to measure the statistical relationship between hardiness and personal capabilities. Also, we used regression analysis to determine the prognostic indicators for hardiness. As a result of our research, we found that the capabilities of contact, trust, hope, love, achievement, and reliability have the greatest influence on hardiness

scholarly journals Automation of the burner of a pirotubular boiler to improve the efficiency in the generation of steam

2021 ◽  
Vol 21 (1) ◽  
pp. 101
Author(s):  
Omar Chamorro-Atalaya ◽  
Diego Goicochea-Vilela ◽  
Dora Arce Santillan ◽  
Martin Diaz-Choque ◽  
Teodoro Diaz-Leyva
Keyword(s):  
Statistical Analysis ◽  
Correlation Coefficient ◽  
Control Strategy ◽  
Programmable Logic Controller ◽  
Programmable Logic ◽  
Pearson’S Correlation Coefficient ◽  
Oxygen Percentage ◽  
Pearson's Correlation ◽  
Main Components ◽  
Analysis Of Dispersion

<span>The purpose of this article is to describe the automation developed by means of a programmable logic controller for the burner of a fire tube boiler, in order to improve the efficiency in the process of generating steam quantified through the percentage of oxygen generated. The implementation was developed under a control strategy based on the use of servomotors that allow to gradually open or close the solenoid valves that dose the amount of air and fuel; Considering that there are multiple elements, I limited the analysis to one of its main components, called the burner. After developing this automation, it was possible to demonstrate the decrease in the variability of the oxygen percentage in relation to the optimal or desired value in the boiler. The experimentally obtained data of the oxygen percentage, were subjected to a statistical analysis of dispersion, in which the value of the Pearson's correlation coefficient was determined, whose value was equal to 0.298; This result allowed to conclude that the degree of variability of the indicator in analysis with respect to time is very low, which means that the variable maintains a constant value, equal to the desired value, after automating the fire tube boiler</span><span lang="IN">.</span>

scholarly journals Association between academic motivation and burnout in dental students at the Tabriz University of Medical Sciences: A longitudinal study

2020 ◽  
Vol 9 (1) ◽  
pp. 14-14
Author(s):  
Fatemeh Pournaghi Azar ◽  
Parnian Alizadeh Oskoee ◽  
Saeedeh Ghaffarifar ◽  
Nafiseh Vahed ◽  
Saba Shamekhi
Keyword(s):  
Correlation Coefficient ◽  
Extrinsic Motivation ◽  
Academic Motivation ◽  
Dental Students ◽  
Medical Sciences ◽  
Pearson’S Correlation Coefficient ◽  
First Semester ◽  
Pearson's Correlation ◽  
Motivation Level ◽  
The Relationship

Background: Health professions students often experience stress and potential burnout while completing their entry-to-practice education; therefore, detecting and monitoring burn out among these students is paramount. This study compared motivation domains and determined the relationship between motivation and academic burnout among students of the Dental Faculty at the Tabriz University of Medical Sciences. Methods: This analytical study was conducted longitudinally with dental students at the Tabriz University of Medical Sciences beginning from 2012, the first semester of the participating first-year students and then in the final semester when the same students graduated in 2017.All students (N = 110) were invited to participate. Academic motivation was assessed using the Valler and Academic Motivation Scale. Comparison between first and last semester motivation scores and the relationship between academic motivation level and burnout subscales was determined using independent t-tests and Pearson’s correlation coefficient tests. SPSS was used for the statistical analysis; P < 0.05 was considered statistically significant. Results: Gender had a statistically significant effect on extrinsic motivation and a motivation: in both the first and last semesters, male students were less extrinsically motivated (P < 0.05).Pearson’s correlation coefficient test found a significant inverse correlation between intrinsic and extrinsic motivation of students in their final semester and the academic efficacy (EF)subscale (r = -0.25, P = 0.015; r = -0.21, P = 0.03, respectively). Conclusion: Results showed that although there was a decrease in motivation level, students had high motivation and low burnout level in their final semester compared to their first semester. Extrinsic motivation was higher than intrinsic at both stages

scholarly journals Analysis of factors increasing the probability of fur chewing in chinchilla (Chinchilla lanigera) raised under farm conditions

2014 ◽  
Vol 14 (1) ◽  
pp. 189-195 ◽  
Author(s):  
Stanisław Łapiński ◽  
Marcin W. Lis ◽  
Anika Wójcik ◽  
Łukasz Migdał ◽  
Iwona Guja
Keyword(s):  
Correlation Coefficient ◽  
Herd Size ◽  
Mixed System ◽  
Considerable Proportion ◽  
Pearson’S Correlation Coefficient ◽  
Important Observation ◽  
Pearson's Correlation ◽  
The Relationship ◽  
Compulsive Disorders ◽  
Question Survey

AbstractThe aim of the study was to assess the extent of fur chewing problems on chinchilla farms. The research was based on a 20-question survey addressed to breeders. A total of 47 anonymous questionnaires were answered. Results showed that the problem of fur chewing was found in as many as 85% of the farms but the proportion of affected animals was usually low (mean±SE: 3.5±0.55%). To determine the relationship between herd size and the extent of the problem, the Pearson’s correlation coefficient was calculated to be r = -0.315 (P≤0.05), possibly indicating the problem to be more severe on smaller farms. No correlation was found between fur chewing and the type of fodder (pellets from different producers), temperature, humidity, type of cage equipment or frequency of dust baths. Moreover, the level of fur-biting animals kept on a deep-litter floor was estimated at 1.7% while the level of those kept on a wire floor and in a mixed system was 2.8-times higher (P≤0.05). The fact that 37.5% of the respondents perceived the predisposition to fur chewing to be hereditary was an important observation suggesting a direction for further research. A considerable proportion of those surveyed (37.5%) also pointed to a greater excitability among fur chewers. To sum up, results of the present study revealed that keeping animals on litter reduces the incidence of fur chewing. Breeders’ observations also suggest that fur biting may be determined genetically and/or connected with impulsive-compulsive disorders; however, more detailed studies are necessary to confirm these hypotheses.

The Evolution of Pearson's Correlation Coefficient

2008 ◽  
Vol 102 (4) ◽  
pp. 292-299
Author(s):  
Gary Kader ◽  
Christine Franklin
Keyword(s):  
Correlation Coefficient ◽  
College Level ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Level Statistics ◽  
Scatter Plots ◽  
Pearson's Correlation ◽  
Measure Of Association ◽  
Pearson's Correlation Coefficient ◽  
The Relationship

Studying the relationship between two quantitative variables is a standard topic in statistics. In high school and introductory college-level statistics, Pearson's correlation coefficient, r, is typically included as a measure of the direction and strength of the linear relationship between two quantitative variables. This article describes an activity that aids an intuitive development of the formula for r and its interpretation. Exploring scatter plots allows students to develop an intermediate measure of association called the quadrant count ratio (QCR), investigate properties of the QCR, and develop Pearson's r to address some of the QCR's shortcomings.

scholarly journals Case Study of Anaerobic Digestion Process Stability Detected by Dissolved Hydrogen Concentration

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 106
Author(s):  
Daniela Platošová ◽  
Jiří Rusín ◽  
Jan Platoš ◽  
Kateřina Smutná ◽  
Roman Buryjan
Keyword(s):  
Anaerobic Digestion ◽  
Correlation Coefficient ◽  
Hydrogen Concentration ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Digestion Process ◽  
Short Service Life ◽  
Pearson's Correlation ◽  
Dissolved Hydrogen ◽  
Pearson's Correlation Coefficient

The paper presents the results of a laboratory experiment of mesophilic single-stage anaerobic digestion performed to verify the possibility of early detection of process instability and reactor overload by evaluating the course of dissolved hydrogen concentration of the main intermediate. The digestion process was run in a Terrafors IS rotary drum bioreactor for 230 days. The substrate dosed on weekdays was food leftovers from the university canteen. At an average temperature of 37 °C, an organic loading of volatiles of 0.858 kg m−3 day−1 and a theoretical retention time of 259 days, biogas production of 0.617 Nm3 kg VS−1 was achieved with a CH4 content of 51.7 vol. %. The values of the established FOS/TAC stability indicator ranged from 0.26 to 11.4. The highest value was reached when the reactor was overloaded. The dissolved hydrogen concentration measured by the amperometric microsensor ranged from 0.039–0.425 mg dm−3. Data were statistically processed using Pearson’s correlation coefficient. The correlation of the hydrogen concentration with other parameters such as the concentration of organic acids was evaluated. The value of Pearson’s correlation coefficient was 0.331 and corresponded to a p-value of 0. The results confirmed a very low limit of the hydrogen concentration at which the microbial culture, especially methanogens, was already overloaded. The amperometric microsensor proved to be rather unsuitable for operational applications due to insufficient sensitivity and short service life. The newly designed ratio of dissolved hydrogen concentration to neutralizing capacity was tested but did not work significantly better than the established FOS/TAC stability indicator.

Italian version of the cornell musculoskeletal discomfort questionnaire (CMDQ-I): Translation, cultural adaptation and validation

Work ◽  
2021 ◽  
pp. 1-7
Author(s):  
F. Magnifica ◽  
F. Colagrossi ◽  
A. Aloisi ◽  
S. Politi ◽  
A. Peretti ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Cultural Adaptation ◽  
Italian Version ◽  
Cronbach’S Alpha ◽  
Musculoskeletal Discomfort ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Cronbach's Alpha ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient

BACKGROUND: Almost 25%of workers in the European Union suffer from back pain, and 23%complain of muscle pain. Sixty-two percent of workers carry out repetitive operations with their hands or arms, 46%work in painful or tired positions and 35%carry or handle loads. OBJECTIVE: This study aimed to translate, culturally adapt and validate the Italian version of the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ-I). METHODS: Translation and cultural adaptation procedures followed international guidelines. Participants were recruited from among the personnel components of the Italian Air Force, who were between 18 and 65 years old. Cronbach’s alpha and the intraclass correlation coefficient (ICC) were calculated to assess internal consistency and stability, respectively. The CDMQ-I was administered together with the Visual Analogic Scale (VAS), and the validity was evaluated using Pearson’s correlation coefficient. RESULTS: All CDMQ-I items were either identical or similar in meaning to the original version’s items. The scale was administered twice with a retest after seven to 10 days to 66 participants. Cronbach’s alpha was higher than 0.761, and the ICC ranged between 0.737 and 0.952. Pearson’s correlation coefficient showed positive and significant correlations (p >  0.01). CONCLUSIONS: The study produced an Italian version of the CMDQ with good reliability and validity. This scale is a useful tool to investigate the frequency and intensity of musculoskeletal disorders in various categories of workers.

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