[Octave-bug-tracker] [bug #48077] CI not correct in ttest

[Álvaro Bertelsen]

Follow-up Comment #4, bug #48077 (project octave):

The modification added to fix the confidence interval makes ttest to crash
when testing paired samples. A simple script like this:


pkg load statistics;

x = random("normal", 0.0, 1.0, [100, 1]);
y = random("normal", 0.0, 1.0, [100, 1]);

ttest(x, y);  % crashes


...produces the following error

error: ttest: operator +: nonconformant arguments (op1 is 2x1, op2 is 100x1)
error: called from
    ttest at line 123 column 10

On line 123, the term my is added to ci. For paired testing, addition of that
term is not needed (and its dimension is not consistent with the size of ci).

I have attached the ttest_crash.m file to reproduce the error.



(file #40449)
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Additional Item Attachment:

File name: ttest_crash.m                  Size:0 KB


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