t test for two samples with different sizes
显示 更早的评论
Hi,
Which function should i use if I want to test whether two samples with different sizes have different means? I see many ttest functions in matlab
采纳的回答
the cyclist
2011-7-10
>> ttest2(x,y)
where "x" and "y" are the vectors of your two samples.
5 个评论
Shafa-At Sheikh
2020-4-27
As per notes, x and y comes from independent random samples from normal distributions with equal means and equal but unknown variances. What about the case, once the variances are unequal?
Is this function also checking the variances before calculating the significance?
the cyclist
2020-4-28
The documentation does state that the simplest syntax assumes equal variances. But if you read a bit further in the description, you will see that there is a calling syntax for unequal variances.
Jules
2024-8-27
you responded nearly 9 years later. dedication.
Jules
2024-8-27
if you see this, i am trying t do a t-test with two sets of unequal size. i do not care about the size difference, is there anyway to bypass this - other than doing it manually ?
the cyclist
2024-8-28
Yes, still dedicated.
I'm unsure of what you mean, specifically I am not sure what you are trying to "bypass".
When you say "size", I assume you referring to the number of observations in each sample. ttest2 doesn't require equal-sized samples. (If you input two samples into ttest, it will do a pairwise test, and will require equal-sized samples.)
What specifically are you testing for, between the two samples? Whether or not they have different means? Or something else?
A careful reading of the documentation should answer your question.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Hypothesis Tests 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
