Results 11 to 20 of about 5,016,758 (243)

Note on the t-Test [PDF]

open access: yesProceedings of the National Academy of Sciences, 1942
Not ...
Wilson, E., Worcester, J.
openaire   +2 more sources

On the T-test

open access: yesStatistics & Probability Letters, 2022
The $T$-test is probably the most popular statistical test; it is routinely recommended by the textbooks. The applicability of the test relies upon the validity of normal or Student's approximation to the distribution of Student's statistic $\,t_n$. However, the latter assumption is not valid as often as assumed.
openaire   +2 more sources

t Testing the Immune System [PDF]

open access: yesImmunity, 2008
Amid the flurry of grant writing and experimentation, statistical analysis sometimes gets less attention than it requires. Here, we describe fully the considerations that should go into the employment of the statistical two-sample t test.
Lamb, Tracey J.   +2 more
openaire   +2 more sources

Non-central t distribution and the power of the t test: A rejoinder [PDF]

open access: yesTutorials in Quantitative Methods for Psychology, 2011
Non-central t distribution needed for assessing the power of the t test is described. Three approximations are compared and their merits discussed in regard to simplicity and accuracy.
Denis Cousineau, Louis Laurencelle
doaj  

Why Psychologists Should by Default Use Welch’s t-test Instead of Student’s t-test

open access: yesInternational Review of Social Psychology, 2017
When comparing two independent groups, psychology researchers commonly use Student’s 't'-tests. Assumptions of normality and homogeneity of variance underlie this test.
Marie Delacre   +2 more
doaj   +1 more source

Performance of the T-SPOTⓇ.COVID test for detecting SARS-CoV-2-responsive T cells

open access: yesInternational Journal of Infectious Diseases, 2021
Objective: To evaluate the performance of the T-SPOT.COVID test for identifying SARS-CoV-2-responsive T-cells in participants with SARS-CoV-2 infection.
Margaret Kruse   +8 more
doaj   +1 more source

Errata to Non-central tdistribution and the power of the t test: A rejoinder [PDF]

open access: yesTutorials in Quantitative Methods for Psychology, 2015
Errors were found in equations 3c and 3d of Cousineau and Laurencelle (2011) Non-central t distribution and the power of the t test: A rejoinder.
Denis Cousineau, Louis Laurencelle
doaj  

Waldian t tests: Sequential Bayesian t tests with controlled error probabilities

open access: yesPsychological Methods, 2021
Bayesian t tests have become increasingly popular alternatives to null-hypothesissignificance testing (NHST) in psychological research. In contrast to NHST, they allow for the quantification of evidence in favor of the null hypothesis and for optional stopping.
Schnuerch, Martin   +2 more
openaire   +4 more sources

Comparison of the empirical variances and mean values of normally distributed populations of nuclear counts [PDF]

open access: yesNuclear Technology and Radiation Protection, 2014
This paper discusses the possibility of applying the F-test and double t-test in problems related to the identification of number of radioactive isotopes in a contaminated area by using only counters for radiation detection.
Lazarević Đorđe R.   +3 more
doaj   +1 more source

Comparison of Current Ratio Errors of Support and Toroidal Type CTs in Electric Power Systems: A Case Study

open access: yesIEEE Access
A current transformer (CT) is a specialized device used to reduce high current values to safe and manageable levels in measurement and protection systems. Current ratio error (CRE) is an inevitable error in CTs due to factors such as magnetic saturation,
Ishak Ozer, Ali Unluturk
doaj   +1 more source

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