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Cytel's LogXact 5 vs. SAS's PROC LOGISTIC:
Antibiotics and Diarrhea in Hospitalized Patients
(Source: From data gathered at the Cornell Medical Center by Jaffe and Chang, 1993.)
Data on 2493 hospitalized patients were gathered to determine the relationship between antibiotic use and an acute form of diarrhea -- clostridium dificile-induced diarrhea (DIARRHED).
(2493 observations, 10 covariates.)
The results are presented below. Note that SAS fails to fit the logistic regression model -- only LogXact 5 can do it.
LOGXACT 5 RESULTS
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Parameter Estimates
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Point Estimate Confidence interval and P-value for Beta
Type Beta SE(Beta) Type 95.0% C.I. Pvalue SE
Lower Upper 2*1-sided
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aged MLE ? ? Asymptotic ? ? ?
bactrppod MLE ? ? Asymptotic ? ? ?
cdifprod MLE ? ? Asymptotic ? ? ?
cephalxd MLE ? ? Asymptotic ? ? ?
clindamd MLE ? ? Asymptotic ? ? ?
gentaivd MLE ? ? Asymptotic ? ? ?
losd MLE ? ? Asymptotic ? ? ?
scuoccud MLE ? ? Asymptotic ? ? ?
CMLE 0.6549 0.3011 Monte Carlo 0.0048 1.2822 0.0462 0.0030
( Seed=1035244198,Samples=10000 )
sexd MLE ? ? Asymptotic ? ? ?
tgcephd MLE ? ? Asymptotic ? ? ?
%CONST MLE ? ? Asymptotic ? ? ?
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Analysis time: 00:11:35
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SAS's PROC LOGISTIC RESULTSWARNING: There is not enough memory available for exact computations.
Try it yourself!
The links below include data files and SAS code that you can download.
LOGXACT 5--
Download LogXact data
View Instructions for LogXact 5 analysis
PROC LOGISTIC--
Download SAS code (includes data)
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