The SAS System 1 #1: Using a regression model to get (unadjusted) differences in mean HDL between men and women 15:12 Wednesday, October 29, 1997 Model: MODEL1 Dependent Variable: HDL CHOLESTEROL IN HDL Q87C3 Analysis of Variance Sum of Mean Source DF Squares Square F Value Prob>F Model 1 7794.56642 7794.56642 37.812 0.0001 Error 177 36487.14307 206.14205 C Total 178 44281.70950 Root MSE 14.35765 R-square 0.1760 Dep Mean 53.69832 Adj R-sq 0.1714 C.V. 26.73761 Parameter Estimates Parameter Standard T for H0: Variable DF Estimate Error Parameter=0 Prob > |T| INTERCEP 1 47.562500 1.46537130 32.458 0.0001 SEX10 1 13.232681 2.15196473 6.149 0.0001 Variable Variable DF Label INTERCEP 1 Intercept SEX10 1 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 2 #2: Means of AGE and ALC by SEX 15:12 Wednesday, October 29, 1997 SEX10 N Obs Variable Label Mean ------------------------------------------------------------------------------ Female 96 AGE COMPUTED AGE IN YEARS AT VISIT 2 53.3125000 ALC AVERAGE DAILY INTAKE OF ETHANOL,DERIVED 13.4612500 Male 83 AGE COMPUTED AGE IN YEARS AT VISIT 2 53.3012048 ALC AVERAGE DAILY INTAKE OF ETHANOL,DERIVED 6.3249742 ------------------------------------------------------------------------------ SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 3 #2: Correlation coefficients for HDL vs. AGE and HDL vs. ALC 15:12 Wednesday, October 29, 1997 Correlation Analysis 2 'WITH' Variables: AGE ALC 1 'VAR' Variables: HDL Simple Statistics Variable N Mean Std Dev Sum AGE 179 53.307263 2.954810 9542.000000 ALC 179 10.152251 15.970520 1817.252857 HDL 179 53.698324 15.772560 9612.000000 Simple Statistics Variable Minimum Maximum Label AGE 50.000000 58.000000 COMPUTED AGE IN YEARS AT VISIT 2 ALC 0 107.737143 AVERAGE DAILY INTAKE OF ETHANOL,DERIVED HDL 22.000000 125.000000 CHOLESTEROL IN HDL Q87C3 Pearson Correlation Coefficients / Prob > |R| under Ho: Rho=0 / N = 179 HDL AGE 0.03937 COMPUTED AGE IN YEARS AT VISIT 2 0.6008 ALC 0.08555 AVERAGE DAILY INTAKE OF ETHANOL,DERIVED 0.2548 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 4 #3: Modelling HDL as a fn of AGE, BMI, ALC, SEX, and the ALC*SEX interaction Testing the interaction -- need partial-F or t 15:12 Wednesday, October 29, 1997 General Linear Models Procedure Number of observations in data set = 179 NOTE: Due to missing values, only 178 observations can be used in this analysis. SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 5 #3: Modelling HDL as a fn of AGE, BMI, ALC, SEX, and the ALC*SEX interaction Testing the interaction -- need partial-F or t 15:12 Wednesday, October 29, 1997 General Linear Models Procedure Dependent Variable: HDL CHOLESTEROL IN HDL Q87C3 Sum of Mean Source DF Squares Square F Value Pr > F Model 5 13496.973088 2699.394618 15.24 0.0001 Error 172 30469.746013 177.149686 Corrected Total 177 43966.719101 R-Square C.V. Root MSE HDL Mean 0.306982 24.74036 13.309759 53.797753 Source DF Type I SS Mean Square F Value Pr > F AGE 1 109.7892179 109.7892179 0.62 0.4322 BMI 1 3395.1866593 3395.1866593 19.17 0.0001 ALC 1 589.5671947 589.5671947 3.33 0.0698 SEX10 1 8696.0879827 8696.0879827 49.09 0.0001 ALC*SEX10 1 706.3420340 706.3420340 3.99 0.0474 Source DF Type III SS Mean Square F Value Pr > F AGE 1 255.5576350 255.5576350 1.44 0.2314 BMI 1 1742.2197077 1742.2197077 9.83 0.0020 ALC 1 893.9228693 893.9228693 5.05 0.0260 SEX10 1 4658.7806713 4658.7806713 26.30 0.0001 ALC*SEX10 1 706.3420340 706.3420340 3.99 0.0474 T for H0: Pr > |T| Std Error of Parameter Estimate Parameter=0 Estimate INTERCEPT 43.00879392 2.12 0.0353 20.27218637 AGE 0.41628048 1.20 0.2314 0.34658663 BMI -0.77446680 -3.14 0.0020 0.24695711 ALC 0.16763000 2.25 0.0260 0.07462286 SEX10 12.23936638 5.13 0.0001 2.38667342 ALC*SEX10 0.33026045 2.00 0.0474 0.16539381 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 6 #5: Finding partial correlation coefficient 15:12 Wednesday, October 29, 1997 General Linear Models Procedure Number of observations in data set = 96 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 7 #5: Finding partial correlation coefficient 15:12 Wednesday, October 29, 1997 General Linear Models Procedure Dependent Variable: HDL CHOLESTEROL IN HDL Q87C3 Sum of Mean Source DF Squares Square F Value Pr > F Model 3 1616.9893125 538.9964375 4.21 0.0078 Error 92 11784.6356875 128.0938662 Corrected Total 95 13401.6250000 R-Square C.V. Root MSE HDL Mean 0.120656 23.79576 11.317856 47.562500 Source DF Type I SS Mean Square F Value Pr > F AGE 1 3.67812225 3.67812225 0.03 0.8658 BMI 1 763.45116775 763.45116775 5.96 0.0165 ALC 1 849.86002250 849.86002250 6.63 0.0116 Source DF Type III SS Mean Square F Value Pr > F AGE 1 1.23190634 1.23190634 0.01 0.9221 BMI 1 958.80413951 958.80413951 7.49 0.0075 ALC 1 849.86002250 849.86002250 6.63 0.0116 T for H0: Pr > |T| Std Error of Parameter Estimate Parameter=0 Estimate INTERCEPT 73.68927965 2.62 0.0102 28.09938531 AGE 0.04335949 0.10 0.9221 0.44213963 BMI -1.19411565 -2.74 0.0075 0.43646116 ALC 0.16625446 2.58 0.0116 0.06454517 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 8 #5: Finding partial correlation coefficient 15:12 Wednesday, October 29, 1997 Model: MODEL1 Dependent Variable: HDL CHOLESTEROL IN HDL Q87C3 Analysis of Variance Sum of Mean Source DF Squares Square F Value Prob>F Model 3 1616.98931 538.99644 4.208 0.0078 Error 92 11784.63569 128.09387 C Total 95 13401.62500 Root MSE 11.31786 R-square 0.1207 Dep Mean 47.56250 Adj R-sq 0.0920 C.V. 23.79576 Parameter Estimates Parameter Standard T for H0: Variable DF Estimate Error Parameter=0 Prob > |T| INTERCEP 1 73.689280 28.09938531 2.622 0.0102 AGE 1 0.043359 0.44213963 0.098 0.9221 BMI 1 -1.194116 0.43646116 -2.736 0.0075 ALC 1 0.166254 0.06454517 2.576 0.0116 Squared Partial Variable Variable DF Corr Type II Label INTERCEP 1 . Intercept AGE 1 0.00010452 COMPUTED AGE IN YEARS AT VISIT 2 BMI 1 0.07523904 ALC 1 0.06726505 AVERAGE DAILY INTAKE OF ETHANOL,DERIVED SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas The SAS System 9 #5: Finding partial correlation coefficient 15:12 Wednesday, October 29, 1997 Correlation Analysis 1 'WITH' Variables: ALC 1 'VAR' Variables: HDL Simple Statistics Variable N Mean Std Dev Sum ALC 96 13.461250 18.525379 1292.280000 HDL 96 47.562500 11.877278 4566.000000 Simple Statistics Variable Minimum Maximum Label ALC 0 107.737143 AVERAGE DAILY INTAKE OF ETHANOL,DERIVED HDL 24.000000 89.000000 CHOLESTEROL IN HDL Q87C3 Pearson Correlation Coefficients / Prob > |R| under Ho: Rho=0 / N = 96 HDL ALC 0.21278 AVERAGE DAILY INTAKE OF ETHANOL,DERIVED 0.0374 SAS program: c:\faiz\sas\source\fall97\bios145\compex2.sas