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.
The Statistical Toolbox is required because Testt calls TINV and TCDF and FCDF functions.
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

You can visit my homepage http://home.tele2.it/cardillo
My profile on XING http://www.xing.com/go/invita/13675097
My profile on LinkedIN http://it.linkedin.com/in/giuseppecardillo

• Required Products: Statistics Toolbox
• MATLAB release: MATLAB 7.1.0 (R14SP3)

[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?

[Ben]

Thanks