Unblock data set                                                   (STB-7: dm8)
----------------

	^unblock^ pos_var pop_var [^, g^enerate^(^new_grp_var^)^ ]



Description
-----------

^unblock^ is for use on data sets organized such that ^blogit^ must be used to 
estimate logistic regression models; see ^help glogit^.  After unblocking, the
superior ^logistic^ command can be used; see ^help logistic^.

pos_var is a variable recording the number of positive responses and pop_var
the total population.  ^unblock^ changes the data in memory so that pos_var 
will be a 0/1 variable with 1 indicating a positive response and pop_var will
contain the total population for the positive or negative response.  Thus, 
after unblocking, you can type "^logistic^ pos_var ... ^[freq=^pop_var^]^" to esti-
mate logisitic models.


Options
-------

^generate(^new_grp_var^)^ creates new_grp_var tying the observations back to their
    original structure.  If two observations in the resulting data set have
    new_grp_var equal to 4, then both came from the 4th observation in the
    original data.  This option is seldom specified.





Example
-------

 . ^blogit deaths pop agecat exposed^

 . ^unblock deaths pop^

 . ^logistic deaths agecat exposed [freq=pop]^



Author
------

Joseph Hilbe, editor, STB.  Fax 602-860-1446.


Also see
--------

    STB:  dm7 (STB-7)
On-line:  ^help^ for ^glogit^, ^logistic^