! Sibling Interaction Model
 ! CBC data in US twins
 
 
 The following MX script lines were read for group  1
 
 G1: MODEL PARAMETERS
 CALC NGROUPS=3
 BEGIN MATRICES;
 X LOWER 1 1 FREE  ! ADDITIVE GENETIC PATH
 Y LOWER 1 1       ! SHARED ENVIRONMENT PATH = 0
 Z LOWER 1 1 FREE  ! NON-SHARED ENVIRONMENTAL PATH
 B SYMM 2 2        ! SIBLING INTERACTION PARAMETER
 I IDEN 2 2
 H FULL 1 1
 END MATRICES;
 SPECIFY B 0 4 0
 MATRIX H .5
 BEGIN ALGEBRA;
 A= X*X' ;
 C= Y*Y' ;
 E= Z*Z' ;
 P= (I-B)~;
 END ALGEBRA;
 OPTIONS NO_OUTPUT
 END
 
 
 The following MX script lines were read for group  2
 
 G2: MALE MZ TWINS IN LARGER FAMILIES
 DATA NINPUT_VARS=2 NOBSERVATIONS=171
 LABELS EXTER1 EXTER2
 CMATRIX SYMMETRIC FILE=USCBCMZ.COV
 
  We have a problem whose error code is  239
  and which I ran across at line number   29
 of your input script
 CMATRIX SYMMETRIC FILE=USCBCMZ.COV
                       ~~~         
  Yikes!!  This file is UNIX format, not DOS format
  You had better convert it with flip or unx2dos or
  some such utility.  Both are available at the Mx website
  Problem occurred in group #   2