Hi,
I've a for example a 5×3 matrix
2015 52 7
2015 53 12
2015 54 20
3096 77 7
3096 83 11
and I want apply the function p = polyfit(x,y,1) to third (independent variable) and second (dependent variable) column. Moreover I want apply the regressions to data which have the same value in the first column. In this case a first regression on the first 3 data and a second regression on the last 2 data. How can I define this criteria?
Thanks
Gianluca
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