On Mon, 11 Jan 2021, Brian Revell wrote:

> To follow up -the error relates to trying to add an addition line which is
> actually a constant value of the dependent variable . I have tried y -
> 12.8, SEDE_UNADJ =12.8 which is the depvar or CL =12.8 whiich is also one
> of the variables in the Gretl variable list,.. Each time error message
> appears.

Brian, if you want to add a horizontal line, just enter the
numerical value into the formula box, e.g.

12.8

Basically the only other thing you can do in that box is type a
formula that references "x" (a hard-wired "x", meaning the x-axis),
as in

sin(x)

"y" or any other identifiers are unknown to gnuplot and will cause
an error.

Allin
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