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Topic revision: 06 Apr 2012, MaryBanach
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Title: Mixed Effects Binary
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| Type of Tool | SAS Macro |
| Title | Mixed Effects Binary |
| Programmer/Email | PeterBacchetti, RossBoylan |
| Contributing Site | UCSF |
| Description | This macro analyzes binary outcomes and tests for the possibility that each case has an unobserved random effect. This is standard logistic regression augmented with a case-specific random intercept, as would be appropriate for clustered observations, for example. The macro estimates the variance of the random intercept and tests the null hypothesis that the variance is zero (i.e., that there is no random intercept). The test is a likelihood ratio test, modified to account for the fact that zero is at the boundary of the range of possible values for the variance [REFERENCE: Stram DO, and Lee JW. Variance-components testing in the longitudinal mixed effects model. Biometrics 50, 1171-1177, 1994]. This is a mixed model, because it combines user-specified fixed effects with a random intercept. Currently, the macro does not create publication quality output. You should check the SAS log to confirm that the model converged properly. To improve execution speed and convergence, this macro uses starting values defined as the estimated coefficients from same model but without the random intercept. |
| Example | Example code |
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| Software Program | SAS |
| Software | SAS |
| Macro Parameters | |
| R-Code - Attachment | |
| R-Code | |
| SAS-Code - Attachment | UCSF_Mixed Effects Binary_Main Macro |
| SAS-Code | |
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| Example Code | SAS Example Code |
| Example Output | |
| SAS Examples | |
| SAS_Example_Code | UCSF_Mixed Effects Binary Test Logimix_SAS Example Code |
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| Special Features | |
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| Notes1-Legend | Section with calls to needed macros |
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| Notes2-Legend | Macro call with fully specified parameters |
| Notes2 | |
| Notes3-Legend | Section with definitions of global macro parameters |
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| Notes4-Legend | Section with definitions of local macro variables |
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| See Also | Possible further work * Add assumption-testing features of the main (fixed effects) logistic macro, as applicable. * Create post-processing companion macros to produce publication-ready output and linked and highlighted html output. |
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| 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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Topic revision: 06 Apr 2012, MaryBanach
Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors. Ideas, requests, problems regarding Foswiki? Send feedback