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st: statistical significance of cut points in ordered logit


From   "Michael I. Lichter" <mlichter@buffalo.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: statistical significance of cut points in ordered logit
Date   Fri, 02 Oct 2009 16:43:30 -0400

Simple question: is there any reason to be concerned about the statistical significance of cut points in ordered logit? I've included output below of an ordered logit where the initial cut point is not significant. (FWIW, under Stata 10 it looks like -svy: ologit- produces p-values but regular -ologit- produces confidence intervals without p-values. Not sure why there's this inconsistency.) The null hypothesis must be that the cut point = 0, and there's no special reason why one of the cut points can't be 0, so this is not a problem, right? Thanks.

Michael


. xi: svy: ologit q3future clin_35-clin_xx sp_imed-sp_mult
(running ologit on estimation sample)

Survey: Ordered logistic regression

Number of strata = 4 Number of obs = 599 Number of PSUs = 599 Population size = 116723 N. of poststrata = 55 Design df = 595 F( 7, 589) = 3.11 Prob > F = 0.0031

------------------------------------------------------------------------------
            |             Linearized
q3future | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
clin_35 | 1.249916 .5458784 2.29 0.022 .1778334 2.321999 clin_6p | 1.736979 1.078776 1.61 0.108 -.3816925 3.85565 clin_xx | -1.362227 .8720265 -1.56 0.119 -3.074851 .3503973 sp_imed | -1.118896 .7232126 -1.55 0.122 -2.539256 .3014635 sp_obgy | -.8694114 .6167969 -1.41 0.159 -2.080775 .3419524 sp_peds | .4568723 .9388721 0.49 0.627 -1.387034 2.300779 sp_mult | .9617215 .7174359 1.34 0.181 -.4472931 2.370736
-------------+----------------------------------------------------------------
/cut1 | -.35083 .5493174 -0.64 0.523 -1.429667 .728007 /cut2 | 1.62023 .6364649 2.55 0.011 .3702395 2.870221
------------------------------------------------------------------------------

--
Michael I. Lichter, Ph.D. <mlichter@buffalo.edu>
Research Assistant Professor & NRSA Fellow
UB Department of Family Medicine / Primary Care Research Institute
UB Clinical Center, 462 Grider Street, Buffalo, NY 14215
Office: CC 126 / Phone: 716-898-4751 / FAX: 716-898-3536

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