Does *anyone* here use Stata (software) that can answer my question?

[bicentennial_baby]

I doubt I'll find anyone, but it's worth a shot.

I'm trying to answer this:

Show that ∑ ( X *e ) = 0, and that ∑ ( Yhat * e ) = 0

I know that neither of them equal zero, my problem is figuring out how to do the sum of the products of the aforementioned variables.

Anyone? Anyone?

[MrCoffee]

1. kick

I don't know what any of that means (how the hell can they NOT equal zero when the thing says =0???), but this is my favorite lounge post of the day, so I'm kicking it.

[bicentennial_baby]

2. Ha! You!

It's a trick question, actually. And very, very irritating. x(

But I'm glad you enjoyed. :rofl:

[Bake]

3. Is this DU Geek Day or something?

:rofl:

Bake

[bicentennial_baby]

4. What did I miss? I had my head immersed in...

Stata10. Ugh.

No, really, I love Econometrics, I do...

:rofl:

[Jean Louise Finch]

5. I am not sure I understand the question

But if all you need is the sum product, can't you just do something like this:

gen newvar=X*e
egen sumnewvar=total(newvar)

And then the same for the other?

Then you can use compare or something like it to see whether those totals both equal zero, which you seem to know they won't. I don't know it that helps cause I'm not sure I understand the question!

Jean Louise