I want to do regression analyses on particular groups of values of a single variable which need sub setting eg:

sdata = subset(data, variable X ==”1″ | variable X == “5”) which works fine

sdata1 = subset(data, variable X == “1,2,3” | variable X == “4, 5”) doesn’t work

It doesn’t like the “,” in the second example. I specifically want to be able to compare the first group to the second and not a series eg

sdata3 = subset(data, variable X ==”1″ | variable X == “2” | variable X == “3”)