indicator variable help on R!!!!

can someone pls help me, I am having a crisis!

i have a model that i want to fit, that is,

yield=alpha_variety + gammaclay_i +delta(rainfall-mean(rainfall)) + error
where there are 4 varieties of wheat labelled A,B,C,D.

I need help on how to input an indicator variable which is clay_i that takes value 1 if any of those 4 varieties of wheat are grown in clay soil and 0, otherwise.

Thank you

What in your data tells you that clay_i should be 1 or 0? It would be very helpful if you posted a bit of your data. If your data are in a data frame named MyData, the command


will return code that allows others to duplicate part of your data.

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