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Step 3 Specify a strategy,for selecting variables,Use p value to select. Selection of,Modified methods Chunkwise Hierarchical. Significant,Use R2 to select,R square Mallow s Cp KKM pages 391 392. Step 3 Specify a strategy,for selecting variables Forward selection. Use p value to select Compute p value of simple, significant independent linear regression for each X s.
variables One by one include variable,forward with p value 05. backward Into model,Stepwise Entry prob 0 05 or less. Stepwise selection Backward selection, Same as forward selection Put all of X s into model. Only double check p value One by one delete any X s. once again when X s enter with p value 05,into model. Entry prob 0 05 or more Removal prob 0 05 or less,Removal prob 0 05 or less.
Related factors for TMD,Model 1 Model 2 Model 3 Model 4. Odds p Odds p Odds p Odds p,Variable 95 CI 95 CI 95 CI 95 CI. Ratio value Ratio value Ratio value Ratio value,25 yrs 1 00 1 00 1 00 1 00. 26 34 1 17 0 64 2 12 1 16 0 62 2 17 1 18 0 64 2 16 1 18 0 63 2 23. 35 yrs 2 83 1 36 6 04 3 02 1 42 6 67 2 85 1 36 6 15 3 09 1 43 6 90. Use this strategy,junior 1 00 1 00 1 00 1 00, senior 1 15 0 65 2 03 1 19 0 66 2 16 1 27 0 71 2 29 1 31 0 71 2 42. No 1 00 1 00 1 00 1 00, Yes 4 48 1 75 13 25 4 02 1 52 12 24 4 56 1 77 13 56 3 97 1 49 12 23.
2 1 00 1 00,3 3 24 1 90 5 61 3 31 1 93 5 78,hierarchically. No 1 00 1 00,Yes 1 10 0 60 2 01 1 22 0 65 2 30,No 1 00 1 00. Yes 1 01 0 57 1 80 0 89 0 49 1 62,betel quid chewing. No 1 00 1 00,Yes 1 54 0 77 3 14 1 53 0 74 3 21,p 0 05 0001. Limitation ORs did not dramatically change,Conduct the specified.
Evaluate the reliability,of the model chosen, Lee et al Journal of Oral Rehabilitation 2007 34 79 87. Regression Diagnostics KKM 212 253,Criteria for goodness of fit. Rosner pages 487 491 519 530,residuals i 1 2 n,Standardized Residuals. Studentized Residuals STUDENT,Jackknife Residuals RSTUDENT. From Kleinbaum Kupper Muller Nizam applied Regression From Kleinbaum Kupper Muller Nizam applied Regression. Analysis and Multivariable Methods Duxbury CA USA Analysis and Multivariable Methods Duxbury CA USA. KKM Page 225,First graphical presentation,Rosner 520 529 or KKM 225.
From Kleinbaum Kupper Muller Nizam applied Regression. Analysis and Multivariable Methods Duxbury CA USA,Second check normal distribution. of residuals KKM 227,check the normality of,Studentized Residuals or. Jackknife Residuals,From Kleinbaum,Kupper Muller n 50 use Shapiro Wilks s test. Nizam applied,Regression n 50 use Kolmogorov Smirnov test. Analysis and p value 0 05 indicate normally,Multivariable.
Methods Duxbury distributed, CA USA From Kleinbaum Kupper Muller Nizam applied Regression. 21 Analysis and Multivariable Methods Duxbury CA USA 22. Third check independence KKM 227,compute Durbin Watson autocorrelation. Fifth check outliers KKM 229 232,when DW close to 0 and p value 0 05. indicate independence,Forth check homogeneity KKM 227. use Jackknife residuals or, compute the absolute value of Studentized studentized residuals t n k 2 2n.
Residuals or Jackknife Residuals and check, the Spearman rank correlation with all X s use Leverage 2 k 1 n. Correlations close to zeros and non use Cook s D 1. significant indicate homogeneity, From Kleinbaum Kupper Muller Nizam applied Regression. From Kleinbaum Kupper Muller Nizam applied Regression Analysis and Multivariable Methods Duxbury CA USA. Analysis and Multivariable Methods Duxbury CA USA 23 24. Violation of assumptions,collinearity s CIs p values Transformation. independence CIs p values KKM pages 251 252,linearity s CIs p values Rosner pages 489 490. homogeneity CIs p values,normality CIs p values,outlier s CIs p values.
Any questions, Rosner Fundamentals of Biostatistics 6th Wadsworth Publishing. KKM Kleinbaum Kupper Muller Nizam applied Regression Analysis.

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