**MX-PC 1.66b** Job started on 03/04/08 at 16:54:44 ! SCRIPT NAME : CTSATUT2.MX (CB) ! GOAL : TO CALCULATE TETRACHORIC CORRELATIONS ! DATA : ORDINAL ! INPUT : CONTINGENCY TABLES ! UNI/BI/MULTI : UNI ! DATA-GROUPS : MZ DZ ! MEANS MODEL : - ! VARIANCE COVARIANCE MODEL(S) : ! 1. NO MODEL ! 2. AS 1, PLUS THRESHOLDS SAME FOR TWIN 1 AND TWIN 2 ! 3. AS 2, PLUS THRESHOLDS SAME FOR MZ AND DZ ! ! DOWNLOADING MX SOFTWARE: HTTP://WWW.VCU.EDU/MX ! MX SCRIPT'S LIBRARY: HTTP://WWW.PSY.VU.NL/MXBIB !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #DEFINE NCAT 3 ! NUMBER OF CATEGORIES PER VARIABLE ! THIS DEPENDS ON THE DIMENSIONS OF YOUR CONTINGENCY TABLE! #DEFINE NTHRES 2 ! NUMBER OF THRESHOLDS = NCAT - 1 The following MX script lines were read for group 1 G1: MZ DATA NGROUPS=2 NI=2 CTABLE NCAT NCAT 368 24 46 26 15 21 54 22 209 BEGIN MATRICES ; R STAND 2 2 FREE ; ! THIS WILL CONTAIN THE TETRACHORIC CORRELATION T FULL NTHRES 2 FREE ; ! THIS WILL CONTAIN NTHRES THRESHOLDS FOR TWIN2 (REFLECTS PREVALENCES) L LOWER NTHRES NTHRES FIXED ; ! THIS MATRIX IS NEEDED IF NTRHRES > 1: WILL BE USED TO MAKE SURE THAT EACH ! SUBSEQUENT THRESHOLD IS LARGER THAN THE FORMER END MATRICES ; VALUE 1 L 1 1 - L NTHRES NTHRES THRESHOLDS L*T; ! ROW 1: ALL THRESHOLDS OF TWIN 1 ! ROW 2: ALL THRESHOLDS OF TWIN 2 COVARIANCES R ; ! TETRACHORIC CORRELATION START 0.8 R 2 1 START .1 T 1 1 T 2 1 ! STARTING VALUES FOR THE THRESHOLDS START .2 T 1 2 T 2 2 BOUND 0.1 5 T 1 2 T 2 2 BOUND -0.999 0.999 R 2 1 END The following MX script lines were read for group 2 G2: DZ DATA NI=2 CTABLE NCAT NCAT 203 22 63 17 5 16 65 12 133 BEGIN MATRICES ; R STAND 2 2 FREE ; T FULL NTHRES 2 FREE ; L LOWER NTHRES NTHRES FIXED ; END MATRICES ; VALUE 1 L 1 1 - L NTHRES NTHRES THRESHOLDS L*T ; COVARIANCES R ; START 0.5 R 2 1 START .1 T 1 1 T 2 1 ! STARTING VALUES FOR THE THRESHOLDS START .2 T 1 2 T 2 2 BOUND 0.1 5 T 1 2 T 2 2 BOUND -0.999 0.999 R 2 1 END PARAMETER SPECIFICATIONS GROUP NUMBER: 1 G1: MZ MATRIX L This is a LOWER TRIANGULAR matrix of order 2 by 2 It has no free parameters specified MATRIX R This is a STANDARDISED matrix of order 2 by 2 1 2 1 0 2 1 0 MATRIX T This is a FULL matrix of order 2 by 2 1 2 1 2 3 2 4 5 GROUP NUMBER: 2 G2: DZ MATRIX L This is a LOWER TRIANGULAR matrix of order 2 by 2 It has no free parameters specified MATRIX R This is a STANDARDISED matrix of order 2 by 2 1 2 1 0 2 6 0 MATRIX T This is a FULL matrix of order 2 by 2 1 2 1 7 8 2 9 10 Mx starting optimization; number of parameters = 10 MX PARAMETER ESTIMATES GROUP NUMBER: 1 G1: MZ MATRIX L This is a LOWER TRIANGULAR matrix of order 2 by 2 1 2 1 1.0000 2 1.0000 1.0000 MATRIX R This is a STANDARDISED matrix of order 2 by 2 1 2 1 1.0000 2 0.8136 1.0000 MATRIX T This is a FULL matrix of order 2 by 2 1 2 1 0.1249 0.3168 2 0.0754 0.1000 GROUP NUMBER: 2 G2: DZ MATRIX L This is a LOWER TRIANGULAR matrix of order 2 by 2 1 2 1 1.0000 2 1.0000 1.0000 MATRIX R This is a STANDARDISED matrix of order 2 by 2 1 2 1 1.0000 2 0.5591 1.0000 MATRIX T This is a FULL matrix of order 2 by 2 1 2 1 0.0497 0.2188 2 0.0698 0.1000 Your model has 10 estimated parameters and 16 Observed statistics Chi-squared fit of model >>>>>>> 14.716 Degrees of freedom >>>>>>>>>>>>> 6 Probability >>>>>>>>>>>>>>>>>>>> 0.023 Akaike's Information Criterion > 2.716 RMSEA >>>>>>>>>>>>>>>>>>>>>>>>>> 0.046 This problem used 0.0% of my workspace Task Time elapsed (DD:HH:MM:SS) Reading script & data 0: 0: 0: 0.01 Execution 0: 0: 0: 0.01 TOTAL 0: 0: 0: 0.02 Total number of warnings issued: 0 ______________________________________________________________________________