Testt

Calculate the Student t Test for unequal or equal samples size, unpaired or paired samples.

Description

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.
Testt requires powerStudent by Trujillo-Ortiz, A. and R. Hernandez-Walls.
URL http://www.mathworks.com/matlabcentral/fileexchange/2907
The Statistical Toolbox is required because Testt calls TINV and TCDF and FCDF functions.
According to john Chandler request, now all statistics are passed to STATS structure, if nargout is declared (STATS=testt(...))

• Required Products: Statistics Toolbox
• MATLAB release: MATLAB 7.1.0 (R14SP3)
• Other requirements: Download the file PowerStudent by Antonio Trujillo-Ortiz http://www.mathworks.com/matlabcentral/fileexchange/2907
• Other Files: license.txt, ; testt.m

[ifan lin]

This m file calls another function: powerStudent, which is not included.

[Giuseppe Cardillo]

The file powerStudent is not included because is not a file of mine. As highlighted in the File Details this is a file of Antonio Trujillo Ortiz (file ID: 2907) that you can download.

[Diego García Bascuñán]

If you get the powerStudent, testt works. It's fantastic do it so easily!!!

[shiva keihaninejad]

this m file is good,easy and useful.many thanks Giuseppe

[Rune W Berg]

There's a small bug in the procedure that prevents you chose 2-tailed test. Its in line 109.

As far as i can see you need to change it to:

109: if tail ~= 0 && tail ~= 1 && tail ~= 2 %check if tst is 0 or 1 or 2

[Giuseppe Cardillo]

You have partially right. I have fixed the bug and uploaded the new file. Thank you very much!

[john Chandler]

can the p-value, etc be passed onto variables?

[B. Creutzfeldt]

Thanks