Linear Regression and group by in R

Question

I want to do a linear regression in R using the lm() function. My data is an annual time series with one field for year (22 years) and another for state (50 sta

Answer 1

The lm() function above is an simple example. By the way, I imagine that your database has the columns as in the following form:

year state var1 var2 y...

In my point of view, you can to use the following code:

require(base) 
library(base) 
attach(data) # data = your data base
             #state is your label for the states column
modell<-by(data, data$state, function(data) lm(y~I(1/var1)+I(1/var2)))
summary(modell)