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 Examples
New in Version 8
Firth's Penalized Maximum Likelihood Estimates (PMLE): Osteogenic Sarcoma
Data with Missing Categorical Covariates: Logistic Regression Model(1)
Data with Missing Categorical Covariates:
Binary Logistic Regression Model (2).
Quality of Life Data: Missing Categorical Covariates Method
(Model: Multiple Linear Regression)
Polytomous Regression : Unordered Response Model
Polytomous Regression : Ordered Response Model
Stratified Poisson Regression.
Examples Library
Insurance Fraud
Osteogenic Sarcoma
Adenocarcinoma Tumors in the Small Intestine
Repeated Measures Data: Cross-over Clinical Trial
StatXact & LogXact: Is the New Analgesic More Effective than Aspirin?
Cytel's LogXact® vs. SAS®'s PROC LOGISTIC
We invite you to compare LogXact, and LogXact PROCs, to SAS's PROC LOGISTIC. We have posted six problems given to us by statistical analysts in a variety of fields that we believe SAS 9's PROC LOGISTIC cannot handle. Download the data and run the SAS code that comes with it. When you are convinced that SAS can't solve these problems, email us at sales@cytel.com and ask for a free 30-day trial of LogXact or LogXact PROCs.
Execution Times for Cytel's LogXact and SAS 9's PROC-LOGISTIC
| Data Set |
SAS's PROC LOGISTIC |
Cytel's LogXact |
| |
|
LogXact® 4 |
LogXact® 5 |
| Crash |
Can't solve |
32 min. |
2 min. |
| UTI |
Can't solve |
Can't solve |
11 min. |
| Death Penalty |
Can't solve |
Can't solve |
15 min. |
| Gene |
Can't solve |
Can't solve |
6 min. |
| Titanic |
Can't solve |
Can't solve |
4 min. |
| Diarrhea |
Can't solve |
Can't solve |
12 min. |
All problems were run on a Pentium 4, XP operating system, with 1GB RAM. The links below include an explanation of the problem, results, plus SAS code and data files that you can download.
- CRASH — Calibration of crash dummies in automobile safety tests
- UTI — Urinary tract infection and contraceptive use
- DEATH PENALTY — Racial bias in death sentencing in New Jersey
- GENE — Relationship between genetic mutation and colon cancer
- TITANIC — Relationship between survival and status on the ship
- DIARRHEA — Antibiotics and diarrhea in hospitalized patients
The universe of datasets for which exact logistic regression is needed is potentially limitless. While no logistic regression software can claim to solve all such problems, LogXact can solve a substantially larger number of these problems than can SAS's PROC LOGISTIC. Moreover, Cytel Software has unmatched experience and expertise in developing algorithms for exact inference, as well as a strong commitment to advanced research and development.
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