How to apply a ttest for specific months?

Hello,

I have a large matrix of 2520x192x144, (month x lon x lat). I would like to do a ttest to compare each year with the same month (ttest of year1 Jan, year2 Jan...... year210Jan) for each month (end result = 12 192x144 matrices).

What would be the best way to set this up?

Thank you,

Holly

Answer 1

[Sai Sri Pathuri]

Hi,

Let the large matrix of dimensions 2520x192x144 be ‘A’. To compare data related to a month for all years, the data is to be separated based on months and t-test is perfomed on each.

month_data=A(month_number:12:2520,:,:); 
h=ttest(month_data); 

For Example,

January_data=A(1:12:2520,:,:); 
January_test=ttest(January_data); 

This produces a matrix of dimension 1x192x144. Thus all months give 12 matrices.