MATLAB: “Error using ttest2 () ALPHA must be a scalar between 0 and 1.” appears when I am trying to define the ttest2 to be one tailed test

Question

Hi All,

I want to get the p-value for a 2 means (and 2 variances) t-test. I tried to define my test to be right tailed test, according to: http://www.mathworks.com/help/stats/ttest2.html

This is the line:

[dummay, p_walls] = ttest2(percent_touching_wall_not_significant,percent_touching_wall_significant,'Tail','Right');

However, it crashes:

Error using ttest2 () ALPHA must be a scalar between 0 and 1.

What is the connection to Alpha? Any Help would be highly appreciated

Thanks in Advance

Answer 1

The current online documentation is for R2016a, and would support they syntax you’re using.

Type:

doc ttest2

in your Command Window to be certain the same syntax is supported in the version you’re using.