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How to calculate intrapair differences?

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Sam
Sam 2015-6-19
关闭： MATLAB Answer Bot 2021-8-20
Hello,
I've got a 12 pairs of twins. Twin 1 has a specific score on a task, and twin 2 has a specific score on the same task. I want to calculate the intrapair differences voor these 12 pairs. How do i do this? (see picture)

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回答（2 个）

Image Analyst
Image Analyst 2015-6-19
Can't you just subtract the two arrays?
diffs = twin1-twin2;
or am I missing something? Surely it can't be that trivial. Did you leave something out?
Star Strider
Star Strider 2015-6-19
You have an unpaired design, so you have to use the appropriate statistical test. (I did not enter your data, so I have done no calculations on them and do not know if they are normally distributed.)
If they are normally distributed, you can use an unpaired t-test. If they are not, use a Wilcoxon rank-sum test.

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