R help - Nov 2012 - Linear regression on dataframe's sample

Hi guys :)
I have a dataframe a

a <- read.dta("imprese.dta")

15867 obs.  and 23 varaible 

I want to make a linear regression on a sample of 300 units

how can i do?
Thank you 



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I fount out a solution ... check it out

random_sample = function (dt, sample_size) {
   # determine the number of records in the data frame
   length_dt = length (dt[,1])
   # extract the sample
   dt [sample (1:length_dt, size = sample_size),]
}





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