[R] Calculating the combined standared errors from two regression equations

Philip Bermingham pberming at arts.ryerson.ca
Wed Aug 23 18:48:54 CEST 2006


Hello,
 
I have two regression equations, one predicts number of interactions from people-a and the other predicts number of interactions from people-b.  I am summing the number of interactions to get the combined number of interactions.  How do I calculate the combined standared error?
 
Philip.



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