PSPP-BUG: [bug #23567] Standardized regression coefficients reported incorrectly

[Jason H Stover]

Update of bug #23567 (project pspp):

                Severity:             5 - Average => 7 - Major              
                  Status:                    None => In Progress            
             Assigned to:                    None => jstover                

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Follow-up Comment #1:

The way to fix this is to change linreg.c to store some more information in
the struct coeff in the linreg cache, then to make linreg.c able to use this
information. This should take a few days. 

The particular problem is on line 256 of regression.q, where reg_stats_coeff
must call gsl_vector_get to get the standard deviation for a variable in the
model. To get the right value, reg_stats_coeff must know which subscript in
the gsl_vector corresponds to the coefficient and variable in question. I
could fix only the particular problem here, but that will leave the general
problem of requiring code for a procedure to access stats for a model by
directly accessing the internal data of the model struct.

The procedure code should be able to get values like this out of the linreg
cache without knowing which subscript holds that value. 

This fix will also make it easier for other models (besides those for linear
regression) that use struct pspp_coeff's to get the necessary values without
reaching into obscure arrays inside the model structure.

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