pagecontract

[javiersan]

Hello,

I have an alpha where the first two observations are the same. If I do pagecontract x<>x(-1) none of the two observations are kept when I think one of them should be.

Is there a way around this?

Thanks,

Javier

[startz]

Check the following...
First observation, x<>x(-1) is false because x(-1) is NA
Second observation, x<>x(-1) is false because it's really false.

(But I haven't checked this myself.)

[EViews Gareth]

Dick is correct.

A quick workaround would be something like:

Code: Select all

series i = x = x(-1) pagecontract if i=0

[javiersan]

Unfortunately that still doesn't work as the first observation is deleted (i.e. i(1)=na so obs 1 is not kept).

I would have expected that for these comparisons the starting point would be observation 2 and the first comparison would be obs 2 vs. obs 1. The comparison of obs 1 vs obs 0 is an impossibility as obs 0 does not exist and it does not make sense to compare something that exists with something that does not exist.

The solution is this

Code: Select all

series i = x = x(-1) i(1)=0 pagecontract if i=0

but I just wonder whether the way the comparison is performed is not inconsistent.

Regards,

Javier