test-t
Student's t test for unpaired or paired samples.
This file is applicable for equal or unequal sample sizes; for paired or
unpaired samples. When the test is unpaired, the Fisher-Snedecor F-test is
performed to assess the equality of variance. If variances are not equal,
Satterthwaite's approximate t test is performed.
Syntax: TESTT(X1,X2,TST,ALPHA,TAIL)
Inputs:
X1 and X2 - data vectors (mandatory).
TST - unpaired (0) or paired (1) test (default = 0).
ALPHA - significance level (default = 0.05).
TAIL - 1-tailed test (1) or 2-tailed test (2). (default = 1).
Outputs:
- t value.
- degrees of freedom.
- Confidence interval of means difference (for paired test)
- p-value
- Power
Example:
X1=[77 79 79 80 80 81 81 81 81 82 82 82 82 83 83 84 84 84 84 85 ...
85 86 86 87 87];
X2=[82 82 83 84 84 85 85 86 86 86 86 86 86 86 86 86 87 87 87 88 ...
88 88 89 90 90];
Calling on Matlab the function: testt
Answer is:
FISHER-SNEDECOR F-TEST FOR EQUALITY OF VARIANCES
F DF_numerator DF_denominator p_value
______ ____________ ______________ _______
1.5379 24 24 0.29861
--------------------------------------------------------------------------------
Variances are equal
--------------------------------------------------------------------------------
STUDENT'S T-TEST FOR UNPAIRED SAMPLES
t DF tail p_value Power
______ __ ____ _________ _______
5.2411 48 1 1.765e-06 0.99958
STATS=TESTT(...) returns a structure with all test(s) statistics
Created by Giuseppe Cardillo
giuseppe.cardillo-edta@poste.it
To cite this file, this would be an appropriate format:
Cardillo G. (2006). Student t-Test for unpaired or paired samples.
http://www.mathworks.com/matlabcentral/fileexchange/12699
Cita come
Giuseppe Cardillo (2024). test-t (https://github.com/dnafinder/testt), GitHub. Recuperato .
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Versione | Pubblicato | Note della release | |
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2.0.0.0 | help correction
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1.6.0.0 | To compute power, Testt requires powerStudent by Trujillo-Ortiz, A. and R. Hernandez-Walls. If this function is not present on the computer, Sandler try to download it from FEX |
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1.5.0.0 | Changes in description |
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1.4.0.0 | STATS structure creation |
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1.3.0.0 | Mistake correction in error handling routines |
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1.2.0.0 | Fisher-Snedecor F-test check added; Satterthwaite's approximation added; changes in output format |
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1.1.0.0 | Change in Help section |
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1.0.0.0 | Improvement in input error handling |