Re: [R] Using a by() function to process several regression (lm()) functions

2009-11-05 Thread Charlie Sharpsteen
On Thu, Nov 5, 2009 at 11:12 AM, Marc Los Huertos wrote: > Hello, > > Thank you very much for looking at this. I have a "seasonal" user for R. I > teach my undergrads and graduates students statistics using R and often find > myself trying to solve problems to process student collected data in an

[R] Using a by() function to process several regression (lm()) functions

2009-11-05 Thread Marc Los Huertos
Hello, Thank you very much for looking at this. I have a "seasonal" user for R. I teach my undergrads and graduates students statistics using R and often find myself trying to solve problems to process student collected data in an efficient way. In this case, I have a data.frame with multiple obs