09-01-2015
maomiss
Calcite | Level 5
Member since
06-23-2011
- 8 Posts
- 1 Likes Given
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Latest posts by maomiss
Subject Views Posted 16336 07-08-2011 11:00 PM 17544 07-05-2011 01:49 PM 1833 03-29-2011 04:02 PM 1864 03-28-2011 08:22 PM 3076 03-28-2011 07:56 PM 3076 03-28-2011 07:55 PM 3362 03-27-2011 08:49 PM -
Activity Feed for maomiss
- Posted Interpretation of Coefficient and Goodness of Fit for Gamma Log Link on Statistical Procedures. 07-08-2011 11:00 PM
- Liked Interpretation of Coefficient and Goodness of Fit for Gamma Log Link for lvm. 07-08-2011 10:56 PM
- Posted Interpretation of Coefficient and Goodness of Fit for Gamma Log Link on Statistical Procedures. 07-05-2011 01:49 PM
- Posted Re: Another question about GENMOD Gamma log link error term on Statistical Procedures. 03-29-2011 04:02 PM
- Posted Another question about GENMOD Gamma log link error term on Statistical Procedures. 03-28-2011 08:22 PM
- Posted Re: Need help with PROC GENMOD /Gamma distribution with log link on Statistical Procedures. 03-28-2011 07:56 PM
- Posted Re: Need help with PROC GENMOD /Gamma distribution with log link on Statistical Procedures. 03-28-2011 07:55 PM
- Posted Need help with PROC GENMOD /Gamma distribution with log link on Statistical Procedures. 03-27-2011 08:49 PM
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Posts I Liked
Subject Likes Author Latest Post 3
07-08-2011
11:00 PM
Hi lvm, Thanks so much! Now I finally understand the basic components of writing a gamma log link model. Is there any literature supporting the (scaled deviance)/df =1 as a good measure of goodness of fitness? Thank you,
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07-05-2011
01:49 PM
Hi, I am fitting a GLM with gamma log link usng proc genmod log link. I have a difficult time of interpreting the coeffient of independent variables of this model. For example, if I get a estimate coefficient of - 0.05 for the predictor X under gamma log link model, how can I interpret it as a relationship with the response variable? Also, what are the criteria for assessing the goodness of fit for gamma log link model using Proc Genmod? Thank you for your help!
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03-29-2011
04:02 PM
Hi lvm, I tried that on my data, and your information is quite helpful! Thank you very much!
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03-28-2011
08:22 PM
Hi,
I am building a model as follows:
proc genmod data = aa;
model totalmedcost= PDC age sex race education /dist=gamma link=log;
run;
Here, I need to check if the estimate of the major predictor PDC is appropriate or unbiased. One of methods is to plot the error of the model (deviance) against PDC to see whether the error is randomly scattered around PDC; another way is to examine the association between deviance and PDC.
However, when I use PLOTS=RESDEV(XBETA), it only generates the plots of deviance residuals as a function of linear predictor, not necessarily the major predictor.
Q1: How could I get the plot of deviance against the specific predictor I want after controlling all the covariates?
Q2: How to get the deviance residual (DR) for each observation, so that I could run the regression of (DR) agaist the predictor PDC?
Thanks for help!
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03-28-2011
07:56 PM
Thank you very much for explanation. Now I understand how to get the group means!
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03-28-2011
07:55 PM
That works! Thank you so much!
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03-27-2011
08:49 PM
Hi,
I am building a multivariable model using proc genmod (gamma and a log link), and I have a major explanatory variable (X1, which is 5-level category variable) and a few covariates.
When I got the output, I had estimates for intercept B0, B1(X1), and estimates for other covairables....but I could not find the overall mean value for the dependent variable in the whole model. Also, I want to calculate the group means by variable X1 in the model.
Are there any ways to calculate the overall mean of dependent variable and the group means by X1 in the gamma and a log link model?
Thanks a lot!
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