question on sample selection

[miorinnovo]

Hi,

I'd like to analyse properties of the first month of each quarter in a data series. I'm thinking I should just create a new series with NA's for all other months but I'm wondering what is a faster way to create the sample than this

Code: Select all

smpl 2000:01 2000:01 2000:04 2000:04 etc etc

Thanks!

[startz]

Maybe

Code: Select all

smpl if @month=1 or @month=4 or @month=7 or @month=10


[miorinnovo]

Thank you!

[EViews Gareth]

Code: Select all

smpl if @quarter<>@quarter(-1)


[EViews Matt]

Or,

Code: Select all

smpl if @mod(@month,3)=1