Re: Multiple 2-variable regressions

[Andreas Guelzow <aguelzow pyrshep ca>]

On Sat, 2010-08-14 at 19:51 -0400, Thomas La Bone wrote:
> I am using Gnumeric 1.10.8 on Windows XP SP3 (which is working quite 
> well by the way). When I go to do a linear regression from the menu:
>
> Statistics -> Dependent Observations -> Regression
>
> I get an interesting window that offers "Multiple 2-variable 
> regressions" with an option for "Multiple dependent (y) variables". 
> These options are not described in the help menu. Can someone refer me 
> to documentation that explains what these options do? Thanks.

Hi Thomas,

these are relatively new options that haven't made it into the manual
yet.

Typically for linear regression you have independent x varaibles
x_1,x_2,x_3,...,x_n and a single dependent varaible y.

The default "multiple linear regression" considers a single linear model
for all n+1 varibales (with the single y dependent, r response,
varaible.)

If you choose "multiple 2 variable regressions" considers n separate
linear models, each for two variables, an independent x_i and dependent
y. 

If you choose "multiple 2 variable regressions with multiple dependent
variables", you need to specify a single independent variable x and
multiple dependent variables y_1 to y_n, and separate linear models are
considered, each for two variables, an independent x and dependent y_i. 

I hope this explains it.

Andreas