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Mr_Nobody
‎09-01-2015
  • 6 Posts
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Re: How GCONV work ? proc logistic data..

by Calcite | Level 5 in Statistical Procedures
‎08-21-2014 09:36 AM
‎08-21-2014 09:36 AM
5 mins ago I found binwidth option make this and You wrote here. Thank you so much. I searched how binwidth works ? I will look at document you suggested. If you know the link of document , can you share with me ? ... View more

Re: How GCONV work ? proc logistic data..

by Calcite | Level 5 in Statistical Procedures
‎08-21-2014 06:59 AM
‎08-21-2014 06:59 AM
Hi again, I searched maximum likelihood algorithm. I want to share a web page about the this problem. http://support.sas.com/resources/papers/proceedings11/343-2011.pdf On page 7 , the author explain why  c statistic has different values on basic calculation and proc logistic. He says "The PROC LOGISTIC may round the probabilities in a higher decimal position during pairing and counting. " Maybe I associate wrong about gconv option. I understand this proc logistic rounding data before the compare. (data is for example: 0,012321732800000000) I want to know this how proc logistic rounding data ? Why basic calculation output different from proc logistic? Thank you so much. ... View more

Re: How GCONV work ? proc logistic data..

by Calcite | Level 5 in Statistical Procedures
‎08-20-2014 08:16 AM
‎08-20-2014 08:16 AM
I am so sorry for my bad English, The last time help me again. suppose that, I have 2 rows of data. if the real_score_col = 0 then model_score_col 0,006828647300000000 0,001962600300000000 then if the real_score_col = 1 then model_score_col 0,012321732800000000 0,049357227400000000 then this values to be compared. 0,012321732800000000 < or = or > 0,006828647300000000 0,012321732800000000 < or = or > 0,001962600300000000 0,049357227400000000 < or = or > 0,006828647300000000 0,049357227400000000 < or = or > 0,001962600300000000 Then İf the gconv = 1e-8 (default) this how to do this comparison ? how data will be changed ? I am so sorry ,I didn't understant your explanation and want to give an example. ... View more

Re: How GCONV work ? proc logistic data..

by Calcite | Level 5 in Statistical Procedures
‎08-20-2014 07:42 AM
‎08-20-2014 07:42 AM
Thanks for the replay. I have read documentation. But I didint understand If the value is less than 1e-8 then it is changed? İf it is true how it is changed? ... View more

How GCONV work ? proc logistic data..

by Calcite | Level 5 in Statistical Procedures
‎08-20-2014 07:19 AM
‎08-20-2014 07:19 AM
Hi, I want to learn how gconv model statement option work ? I think it round data but how ? İt's default value 1E-8. What is that mean? Is there anyone to explain me with simple examples? Thanks. I am giving a proc logistic output : The LOGISTIC Procedure   Model Information Data Set TMP1.HSB2 Response Variable ses Number of Response Levels 3 Number of Observations 200 Model cumulative logit Optimization Technique Fisher's scoring   Response Profile Ordered Total   Value ses Frequency   1 3 58   2 2 95   3 1 47 Probabilities modeled are cumulated over the lower Ordered Values.   Model Convergence Status   Convergence criterion (GCONV=1E-8) satisfied. Score Test for the Proportional Odds Assumption Chi-Square DF Pr > ChiSq   2.1498 3 0.5419   Model Fit Statistics   Intercept   Intercept and Criterion Only Covariates AIC 425.165 399.605 SC 431.762 416.096 -2 Log L 421.165 389.605   Testing Global Null Hypothesis: BETA=0 Test Chi-Square DF Pr > ChiSq Likelihood Ratio 31.5604 3 <.0001 Score 28.9853 3 <.0001 Wald 29.0022 3 <.0001   Analysis of Maximum Likelihood Estimates   Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 3 1 -5.1055 0.9226 30.6238 <.0001 Intercept 2 1 -2.7547 0.8607 10.2431 0.0014 science 1 0.0300 0.0159 3.5838 0.0583 socst 1 0.0532 0.0149 12.7778 0.0004 female 1 -0.4824 0.2785 3.0004 0.0832   Odds Ratio Estimates   Point 95% Wald Effect Estimate Confidence Limits science 1.030 0.999 1.063 socst 1.055 1.024 1.086 female 0.617 0.358 1.066 Association of Predicted Probabilities and Observed Responses Percent Concordant 68.1 Somers' D 0.368 Percent Discordant 31.3 Gamma 0.370 Percent Tied 0.6 Tau-a 0.235 Pairs 12701 c 0.684 ... View more
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