Comparing series with missing values

[paues]

I need to write an if statement that compares if some series are identical, but I am having some troubles with series that contain missing values. What I would like to write is this

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!error=0 for %s {%series} 'If all observations are identical in the two series (irrespective of whether those identical observations are missing or not) if {%s}<>_{%s} then !error=1 endif next

but that returns an error whenever a series contains a missing value. What to do?

[trubador]

@eqna command does what you want, but you may need few more steps:

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... series comp = @eqna(y1,y2) if @min(comp)=0 then !error = 1 endif ...

[paues]

Thank you! I tried using @eqna() directly in the if statement without success. I guess it only works on one observation at a time.