Statistical Analysis on the Sources of Variance in Proficiency Test of Quantitative Analysis of Medicines

2007 ◽  
Vol 37 (1) ◽  
pp. 27-37
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Proficiency Test

Statistical analysis of nematode counts from interlaboratory proficiency tests

Nematology ◽  
2014 ◽  
Vol 16 (2) ◽  
pp. 229-243 ◽  
Author(s):  
Wim Van Den Berg ◽  
Olaf Hartsema ◽  
Loes J.M.F. Den Nijs
Keyword(s):  
Statistical Analysis ◽  
Proficiency Test ◽  
Meta Analysis ◽  
Proficiency Tests ◽  
Free Living ◽  
Accuracy And Precision ◽  
Mean And Variance ◽  
The Mean ◽  
Interaction Variance

A series of proficiency tests on potato cyst nematode (PCN; ) and free-living stages of Meloidogyne and Pratylenchus () were investigated to determine the accuracy and precision of the nematode counts and to gain insights into possible trends and potential improvements. In each test, each participating laboratory received ten samples of soil collected from naturally infested fields and well mixed before distribution. The variance between the counts from the ten samples, estimated per test and laboratory, was constant for PCN cysts and free-living stages of Meloidogyne spp. and Pratylenchus spp. during the period monitored. However, during the initial years, the variance between the samples showed a downward trend for PCN living juveniles. The variance between the laboratories, estimated per test, was constant for PCN cysts over the period 1994-2010. For PCN living juveniles the variance between laboratory means declined from 1994-2000 and from 2000 it was more or less constant, which coincided with the introduction of a well-described new methodology. For Meloidogyne spp. and Pratylenchus spp., from 1998-2005 the variance between laboratory means was more or less constant or increased. From 2006, all participating laboratories incubated the organic matter and the variance between the laboratories was stable and below the levels observed during 2003-2005. After discarding data from initial years with unstable variances of the nematode counts, a meta-analysis was carried out on the remaining data using HGLMs to model the mean and variance of the counts simultaneously. The within-laboratory variance for the ten samples and the interaction variance of test and laboratory were estimated and combined to percentage coefficient of variation (%CV) per laboratory. For PCN cysts, %CV per laboratory ranged from 12.6 to 41.6 and for PCN juveniles in sandy soil from 24.4 to 67.4 and in loamy soil from 37.9 to 102.0. For Meloidogyne spp., %CV ranged from 53.2 to 84.4 and for Pratylenchus spp. from 24.3 to 90.6. The quality of a proficiency test is largely defined by random distribution of the nematodes over the samples allocated, statistical analysis of the data and communication of the results to participating laboratories. This study provides insights into the accuracy and precision at laboratories in recent years and the effect of concerted actions during the period in which the proficiency tests were conducted.

scholarly journals Reevaluating the Influence of Leaders Under Proportional Representation: Quantitative Analysis of Text in an Electoral Experiment

2021 ◽  
Vol 12 ◽  
Author(s):  
Annika Fredén ◽  
Sverker Sikström
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Statistical Models ◽  
Proportional Representation ◽  
Previous Literature ◽  
Vote Choice ◽  
Election Campaigns ◽  
Similar Extent ◽  
Text Data ◽  
Representation Systems

We propose that leaders play a more important role in voters’ party sympathy in proportional representation systems (PR) than previous research has suggested. Voters, from the 2018 Swedish General Election, were in an experiment asked to describe leaders and parties with three indicative keywords. Statistical models were conducted on these text data to predict their vote choice. The results show that despite that the voters vote for a party, the descriptions of leaders predicted vote choice to a similar extent as descriptions of parties. However, the order of the questions mattered, so that the first questions were more predictive than the second question. These analyses indicate that voters tend to conflate characteristics of leaders with their parties during election campaigns, and that leaders are a more important aspect of voting under PR than previous literature has suggested. Overall, this suggests that statistical analysis of words sheds new light of underlying sympathies related to voting.

scholarly journals Quantitative analysis of cryptocurrencies transaction graph

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Amir Pasha Motamed ◽  
Behnam Bahrak
Keyword(s):  
Growth Rate ◽  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Power Law ◽  
Degree Sequence ◽  
Power Law Distribution ◽  
Comprehensive Comparison ◽  
Statistical Studies ◽  
Financial Transactions ◽  
Over Time

AbstractCryptocurrencies as a new way of transferring assets and securing financial transactions have gained popularity in recent years. Transactions in cryptocurrencies are publicly available, hence, statistical studies on different aspects of these currencies are possible. However, previous statistical analysis on cryptocurrencies transactions have been very limited and mostly devoted to Bitcoin, with no comprehensive comparison between these currencies. In this study, we intend to compare the transaction graph of Bitcoin, Ethereum, Litecoin, Dash, and Z-Cash, with respect to the dynamics of their transaction graphs over time, and discuss their properties. In particular, we observed that the growth rate of the nodes and edges of the transaction graphs, and the density of these graphs, are closely related to the price of these currencies. We also found that the transaction graph of these currencies is non-assortative, i.e. addresses do not tend for transact with a particular type of addresses of higher or lower degree, and the degree sequence of their transaction graph follows the power law distribution.

Quantitative Analysis of Limonin in Grapefruit Juice Using an Enzyme-Linked Immunoassay: Interlaboratory Study

1991 ◽  
Vol 74 (3) ◽  
pp. 513-515 ◽  
Author(s):  
Wilbur W Widmer ◽  
Russell L Rouseff
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Grapefruit Juice ◽  
Interlaboratory Study ◽  
Analysis Method ◽  
Method Performance ◽  
Relative Standard ◽  
Statistical Analysis Method ◽  
Standard Deviations ◽  
The One

Abstract Eleven laboratories participated in an interlaboratory study of an enzyme-linked immunoassay for limonin in grapefruit Juice. Participating laboratories received training and practice samples until familiar with the procedure. Laboratories then received 8 sample pairs of grapefruit Juice as blind duplicates. Samples were refrigerated and analyzed within 4 days of receipt. Results from 1 laboratory and 6 Individual samples were excluded from the statistical analysis. Method performance was measured by the one-way component of variance analysis. Repeatability relative standard deviations (RSDr) ranged from 7.0 to 15.6%. Reproducibility relative standard deviations (RSDR) ranged from 12.9 to 29.4%

scholarly journals Faktor-Faktor Yang Mempengaruhi Kemauan Membayar Pajak Wajib Pajak Orang Pribadi Pada Kantor Pelayanan Pajak Pratama Senapelan Pekanbaru

2016 ◽  
Vol 2 (3) ◽  
pp. 205-209
Author(s):  
Faizah Kamilah
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Willingness To Pay ◽  
Qualitative Analysis ◽  
Qualitative Data ◽  
Sampling Technique ◽  
Coefficient Of Determination ◽  
Validity And Reliability ◽  
Tax Laws

This study aimed to analyze the influence of consciousness of paying taxes, knowledge and understanding of tax laws on the willingness to pay taxes individual taxpayers who do the work free.The sample in this study are 100 individual taxpayers who do the work free on KPP Pratama Pekanbaru randomized using a sampling technique accidental sampling and then analysis of data obtained using the analysis of quantitative and qualitative data. Quantitative analysis includes: validity and reliability, the classic assumption test, multiple regression analysis, hypothesis testing through t test and F, as well as the coefficient of determination (R2). Qualitative analysis is the interpretation of the data obtained in the study and the results of data processing that has been carried out by giving a description and explanation. Statistical analysis showed that the consciousness of paying taxes, knowledge and understanding of tax laws partial and simultaneous positive and significant impact on will pay taxes. Keywords: Willingness to pay taxes, pay taxes awareness and knowledge of tax laws

scholarly journals ANALISIS IMPLEMENTASI PENGANGGARAN BERBASIS KINERJA TERHADAP AKUNTABILITAS PEMERINTAH DAERAH (Studi pada Instansi Pemerintah Daerah)

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Endang Mahpudin Made Panji Syamsul
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Local Government ◽  
Research Design ◽  
Quantitative Method ◽  
Good Governance ◽  
Secondary Data ◽  
Government Agencies ◽  
Independent Variables ◽  
Descriptive Method

The implementation of good governance is a prerequisite condition for every government to achieve people's aspirations. Every work unit is determined to reach agency accountability as the consequence of the mandate/responsibility it carries. This is done through considering the resources it manages in order to make government and development run effectively and efficiently, clean and responsibly.� The research aims to find out and analyze the influence of performance-based budgeting performance on the accountability of government agencies within Karawang Regency. This research uses descriptive quantitative method in the form of statistical analysis, where the data is sourced from primary and secondary data coming from local government of Karawang Regency or other institutions related to this research. Descriptive method is a method that describes and presents an object as it is. Quantitative analysis in research design is intended to know the influence between independent variables with dependent variable. Based on the results of analysis and discussion, a conclusion can be drawn, that the implementation of performance-based budgeting affects the accountability of local government agencies within Karawang Regency. Improved implementation of performance-based budgeting will be followed by increased accountability of local government agencies. �Keywords:� Performance-based Budgeting, Accountability, Local Government

scholarly journals Quantitative Analysis of Phenolic Acids and Antiplatelet Activity of Melissa officinalis Leaf Extracts

2017 ◽  
Vol 12 (1) ◽  
pp. 1934578X1701200 ◽  
Author(s):  
Željan Maleš ◽  
Andrea Antolić ◽  
Ivana Babić ◽  
Sandra Jurić ◽  
Mirza Bojić
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Phenolic Acids ◽  
Rosmarinic Acid ◽  
Final Concentration ◽  
Total Phenolic ◽  
Antiplatelet Activity ◽  
Melissa Officinalis ◽  
Leaf Extracts ◽  
Lemon Balm

The contents of total phenolic acids and rosmarinic acid were determined and the antiplatelet potential assessed of extracts of lemon balm ( Melissa officinalis L., Lamiaceae) leaf samples collected during 2014 and 2015. The quantity of total phenolic acids ranged from 4.8 to 8.5%, while the rosmarinic acid content ranged from 1.78 to 4.35%. Results of statistical analysis showed that the undiluted extracts have antiplatelet activity in the ADP test (final concentration 31.25 mg/L). While there are reports on antiplatelet activity of lemon balm essential oil, to the best of our knowledge, this is the first report on antiplatelet activity of lemon balm leaf extracts.

scholarly journals Analysis of Environmental References in the Texts of the Four Gospels Using Descriptive Statistics

Religions ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 266 ◽  
Author(s):  
Zoe Gareiou ◽  
Efthimios Zervas
Keyword(s):  
Statistical Analysis ◽  
Quantitative Analysis ◽  
Human Action ◽  
Natural World ◽  
Descriptive Statistics ◽  
Human Beings ◽  
The Third ◽  
Anthropogenic Environment ◽  
The New Testament ◽  
Descriptive Statistical Analysis

Christian ecotheology uses theology to examine the consequences of human action on ecology. It comes from the notion that the natural world is the creation and the good of God. The study of the Sacred Texts and the analysis of their references to the environment provides information on the relation of human beings to the environment and reveals the approach of each author. In this study, a detailed descriptive statistical analysis of the environmental references of the four Gospels of the New Testament was carried out. The different aspects of the environment (natural, anthropogenic, and spiritual) were explored and a quantitative analysis of the environmental references was performed for the texts of the four Gospels using descriptive statistics measures. The results show that the anthropogenic environment is the most commonly cited, with the spiritual environment coming next and the natural environment in the third position.

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