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I want to add a colume to a data frame by some rules, in stata the command is "gen" or "egen" ,but what is it in R?

Suppose I have written a R program and saved it in test.R . How can I call the program in the command line?

I want to use double-exponential smoothing to forecast time series datas,but I couldn't find it in the document,does R support this method?

Suppose I have two var x and y,now I want to fits a natural cubic spline in x to y,at the same time create new var containing the smoothed values of y. How can I get it?

I am a new R-language user. I have set up a data frame "mydata",one of the colume of which is "skill". Now I want to select the observations whose "skill" value is equal to 1,by what command...

I am a new R user. Now I have some problem while I use R. I have set up a data frame called "mydata". One of the colume of it was "skill". Now I want to select the observations of...

In a data frame I have a column "date" and a column "time",now I want to generate a new column which is the mean of the value of time group by date. In stata the command is egen scalls...

I want to forecaste the call number everyday for a call-center. Now I have removed the influence of the fluctuation with some method, so only thing left is to analyze the trend of the call number every day. I...