I am trying to calculate t-tests between several groups and a control group. The number of groups can change - does anyone know how to make this work? If I enter a comma separated list of properties - the names of the treatment groups - it only gives one p-value where as I want a value for each treatment group.
Also I have not managed to get the calculation to agree with Excel - I want a two tailed t-test with unequal variance.

Thanks,

Sally Luke
Xyrho.com