Hi,

I'm trying to learn how to use Kaufman's* 'icalc' suite of commands to probe interactions and I'm running into problems on basically the first step (the 'intspec' command).

I try this:

Code:
sysuse auto.dta, clear

gen repxtrunk = rep78*trunk

reg price rep78 trunk repxtrunk

intspec, focal(trunk) main((rep78) (trunk)) int2(repxtrunk)

Even with the most basic specification of 'intspec', I get this error:

HTML Code:
invalid 'focal'
r(198);

I've looked around for a solution but I haven't found anything. I've even copied the exact examples from pages 189-90 of that book with the same result.

If anyone has any idea, I would love to hear!

Owen Gallupe

p.s., using Stata/MP 14.2 for Mac.

To install 'icalc':

Code:
net from http://www.icalcrlk.com
and click on first link.

* Kaufman, R. L. (2019). Interaction Effects in Linear and Generalized Linear Models. Thousand Oaks, CA: SAGE Publications Inc. http://us.sagepub.com/en-us/nam/inte...els/book253602.