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help for ^logprof^                                                (STB-56: sg148)
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Confidence Intervals based on the profile likelihood after logistic regression
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   ^logprof^ varname [^,^ ^lev^el^(^#^)^ ^nog^raph ^or^ { ^inc(^#^)^ | ^incfrac(^#^)^ }
                        ^f^rom^(^#^)^ ^t^o^(^#^)^ ^sav^ing^(^filename^)^ ]

^logprof^ is only available after @logistic@ or @logit@.


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

^logprof^ calculates confidence intervals based on the profile likelihood
for logistic regression models.  The profile log-likelihood is calculated
over a range of beta coefficients and confidence intervals obtained.


Options
-------

^inc(^#^)^ specifies the interval between each value of the beta
coefficient. If the confidence interval is unbounded, the increment
may be too high.  The default value of ^inc^ is 0.01 (unless ^incfrac^
is used instead).

^incfrac(^#^)^ is an alternative to inc, where the increment is based 
on the value of the estimated beta coefficient. 
For example, ^incfrac(100)^ would correspond to an increment of 
one-hundreth times the estimated beta coefficient.

^level(^#^)^ specifies the significance level, in percent, for
confidence intervals; see help @level@.  The default is 95%.

^or^ requests confidence intervals to be displayed in terms of an 
odds ratio.

^nograph^ suppresses the graphing of the profile likelihood.

^from(^#^)^ specifies the value of the beta coefficient to start iterating from.

^to(^#^)^ specifies the value of the beta coefficient to stop iterating at.

^saving(^filename^)^ requests the graph be saved.

Both ^from^ and ^to^ have default values based on the logistic
regression model previously fitted.


Examples
--------

	. ^logistic dead year age, offset(offset)^
	. ^logprof age, or^

	. ^logistic foreign weight mpg^
	. ^logprof weight, inc(0.001) f(-2) t(3)^


Author
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    Mark S. Pearce
    Department of Child Health
    University of Newcastle upon Tyne.
    m.s.pearce@@ncl.ac.uk

Also see
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On-line:  help for @logistic@.