Displaying 2 results from an estimated 2 matches for "langensk".
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landesk
2003 Apr 21
3
To create a Panel and run a Pooled OLS
Dear all,
I have tried to merge two cross sections (crossA and crossB) as follows, both
crossA and crossB include the same variables, e.g., ID,y,x1,x2:
Panel <- merge(crossA,crossB,by="ID")
I have, thereafter, tried to run the following pooled OLS:
OLS <- lm(Panel$y~Panel$x1+Panel$x2)
and have received the following error message "Error in model.frame(formula,
rownames,
2003 May 02
3
Creating Dummy Variables with if else phrase
Dear All,
I want to do 52 state dummy variables. In order to make it easier for me, I
thought of using the below commands. (x is the vector with state variables,
matrix will correspond to the dummy variables)
x <- c(1,2,NA,4)
matrix <- matrix(0,nrow=4,ncol=4)
for (i in 1:4) {
if (is.real(x[i])) {
matrix[i,x[i]] <- 1 } else {
matrix[i,] <- rep(NA,4)
}
}
This gives me the