Normalising variables to create interaction term

[ERIC Fosu OTENG-ABAYIE]

I get the error message "command norm is unrecognized" for panel data.

/creating the interaction term between FDI and PIES//

//first normalized the variables involved//
norm x, by(ID) method(mmx)
norm y, by(ID) method(mmx)

rename mmx_x x_N
rename mmx_y y_N


Any help, please?

[Rich Goldstein]

there is such a program at SSC - if that is the one you want, you need to install it before attempting to use it:

ssc install norm

you didn't ask, but I wonder why you want to do this - in my opinion it makes things harder to understand and is certainly not necessary