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Hi- I am using the following code: start=c(alpha=0.4,beta=0.4) warm.10<-nls(warming$umoles60~alpha*exp(beta*warming$T10cm),start = start,data=warming,na.action=na.omit) This code works for other columns in my dataset that are similar to $T10cm but the code does not work for this particular column (T10cm). I am assuming this is because warming$T10cm contains NAs. I have tried just