Type of Tool  SAS Macro 
Title  Logistc Regression 
Programmer/Email  PeterBacchetti 
Contributing Site  UCSF 
Description  This is a macro for performing logistic regression with a binary outcome, checking model assumptions, and producing output that is arranged in a way suitable for use in publications. Some features that add convenience include automatically creating quartile categories for specified predictors, rescaling numeric predictors to make odds ratios more interpretable, and showing counts for categorical predictors. 
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Software Program  SAS 
Software  SAS 
Macro Parameters 
Parameters for Logistic Macro: DSName = name of SAS data set Outcome = name of outcome variable. This variable is assumed to be coded 0, 1 and the model predicts the probability of a 1 outcome. Predictors = list of predictor variables. This list should include class variables and variables to be 'quartiled.' Interaction variables may be included in which case the predictor list should be quoted, e.g. Predictors = %quote(Age Gender Age*Gender). Note: all variables appearing in interaction terms should also appear as main effects. Classvar = classification variables with reference level. Use %quote function. For example, Classvar=%quote(Gender(ref='Male')Race(ref='Asian')) Gender and Race could be numeric variables with formatted values of Male or Asian or they could be alphanumeric variables with string values of 'Male' and 'Asian'. Do not include variables for which quartiles are to be generated. Quartiles = list of numeric variables which should be entered into the model as class variables with four quartile levels. Variables in this list will not be included in the model as linear predictors. Quad = Y/N for creating and testing quadratic terms (default = Y) Out = name of output SAS data set containing logistic estimates, pvalues, etc. Print = Y/N (default = N) Include = F,P,FP,or N F = frequencies of outcome variable are displayed for each class variable value, e.g., Sex Female 31/100 P = percentages are displayed with class variable values, e.g., Sex Female 31.0% FP = frequencies and percentages are displayed with class variable values, e.g., Sex Female 31/100 (31.0%). N = no frequencies or percentages are displayed with class variable values (default = FP) Obs = Y/N If Y, then the number of observations in each outcome group and the total are displayed. (default = Y) LL = Y/N If Y, then 2log(likelihood) is displayed. (default = N) HL = Y/N If Y, then the HosmerLemeshow pvalue is displayed along with the number of groups of estimates (default = N). 
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SASCode  Attachment  UCSF_Logistic RegressionMain Macro 
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Example Code  SAS Example Code 
Example Output  SAS Example Output 
SAS Examples 
Macro to make hyperlinked output Logistic Regression Example with hyperlinked output 
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SAS_Example_Output  Output file created by above example 
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Special Features  Printing 
Special Features Attached  Ordinary printing macro 
Special Features Text 
Special Features of Logistic macro: The macro will automatically test a quadratic term for numeric (nonclass) predictors with more than two values. The macro will automatically output odds ratios that have been rescaled until the units > 1/10 of the IQR. 
Notes1Legend  Section with calls to needed macros 
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Notes2Legend  Macro call with fully specified parameters 
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Notes3Legend  Section with definitions of global macro parameters 
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Notes4Legend  Section with definitions of local macro variables 
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See Also 
Research Topic: Logistic Regression 
Checklists  Logistic Regression Checklists 
Stat Tools Disclaimer 

Discliamer 
The views expressed within CTSpedia are those of the author and must not be taken to represent policy or guidance on the behalf of any organization or institution with which the author is affiliated. 
Permission 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF ERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT OLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
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