Help on creating a new variable

[walid benmouna]

'Create a variable which gives you the change in price from the 1st to 2nd period of a combination'

can anyone help? message me if you would like more background would really appreciate it

[Phil Bromiley]

This sounds like a homework assignment. As a matter of policy (see the FAQs on asking questions), we don't do homework for folks. Try reading about lags and generate.

[Marcos Almeida]

You may try to read about time-series operators in Stata.

Please read carefuly the FAQ. There you'll find the "principles and practices" related to this Forum.

[Nick Cox]

In fact a variant on this was posted at https://www.reddit.com/r/stata/comme...help_on_my_cw/

(I guess one of many meanings for "cw" is coursework.)