Different ways to check for NA

Ecovi · Postby **Ecovi** » Wed Aug 20, 2014 3:27 am

What is the difference between @isna(a) and a=na in if statements? Which one would be better or faster? The result is the same.

EViews Gareth · Postby **EViews Gareth** » Wed Aug 20, 2014 5:43 am

They're essentially the same.

Ecovi · Postby **Ecovi** » Wed Aug 20, 2014 7:44 am

Thanks!

EViews Glenn · Postby **EViews Glenn** » Wed Aug 20, 2014 7:53 am

The former is a bit easier to read when using expressions, as in the admittedly artificial example

(log(y)*(exp(x)=37))=na

versus

@isna(log(y)*(exp(x)=37))

EViews Gareth · Postby **EViews Gareth** » Wed Aug 20, 2014 7:57 am

And you can use @isna inside other functions

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