


Hello,

I'm a R beginner and I want to make a Multiple Regression about birds. My data is stord in a .csv file. 
I tried to do this with the following code:

reg.data <- read.table(file.choose(),header=T, sep=";",dec=",")
attach(reg.data)
names(reg.data)
model <- lm(Flights ~ Age + Gender + weight +  CountryGermany + CountryItaly + CountrySpain + CountryAustria + CountrySwiss + CountryGB + CountryFrance + CountryIreland + CountryNL + CountryBelgium + CountrySweden + CountryNorway + CountryUSA + CountryBrasil)
plot(model)

After the function plot(model), I get the two Warnings:
1: NaNs produced in: In sqrt(crit * p * (1 - hh)/hh)
2: NaNs produced in: In sqrt(crit * p * (1 - hh)/hh)

Can anybody tell me:
 - How can I interpret this warnings?
 - How I can find out at which point this warning apears?
 - How I can find out which column is responsible for the error?
 - And if there is a possiblity to avoid this warnings?

Thanks

 		 	   		  
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