Where is the intercept in regress

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Nuchto
Nuchto 2013-6-7
When you use the "regress" function, where is the intercept?

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ARS
ARS 2013-6-7
Hi,
In my limited knowledge, you will have to include a very first column of 'ones' in the independent variables side(matrix). Then use regress function and the very first beta coefficient will be the intercept.
An example is available here:
http://www.colorado.edu/geography/class_homepages/geog_4023_s07/labs/lab3/html/lab3.html#2
click on 'Regress' on the page and you will notice "ones" function:
  • X = [ ones(N,1) airqual(:,[18 19 20]) sin(Wd) cos(Wd) airqual(:,22)]*
Hope it helps.
Thanks.
  2 个评论
Nuchto
Nuchto 2013-6-7
That makes perfect sense, thanks!
ARS
ARS 2013-6-7
Please "accept" the answer if it works fine.
Thanks.

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