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illegal lag

asked 2014-11-13 19:06:00 +0000

EDP gravatar image

I'm using the following equation in a nonlinear regression:

LnVol=AEXP(-a1(TV+LAG(TV)/10)) + BEXP(-b1TV_Net) + Baseline

I receive a warning for every line: "Illegal Lag"

Why am I receiving this warning message?

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answered 2014-11-18 22:58:26 +0000

It is not easy to determine the cause of this without seeing the rest of the data / script. To resolve these sorts of things try:

Assign the LAG(TV) to a variable and then use that within the command - see if the error repeats.

e.g.

GENR LAGTV=LAG(TV)

  • Check the sample size to be sure sufficient data exists for all variables.
  • Attempt a simpler equation before adding complexity. If the problem is intractable you may pick up the reason.
  • If this fails, send an example that replicates the problem along with the data and commands, to SHAZAM Help and we will take a look.
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Asked: 2014-11-13 19:06:00 +0000

Seen: 385 times

Last updated: Nov 18 '14