I have run the following code: OPTION PS=62 LS=80; DATA ONE; INPUT X Y; CARDS; 1.15 0.99 1.90 0.98 3.00 2.60 3.00 2.67 3.00 2.66 3.00 2.78 3.00 2.80 5.34 5.92 5.38 5.35 5.40 4.33 5.40 4.89 5.45 5.21 7.70 7.68 7.80 9.81 7.81 6.52 7.85 9.71 7.87 9.82 7.91 9.81 7.94 8.50 9.03 9.47 9.07 11.45 9.11 12.14 9.14 11.50 9.16 10.65 9.37 10.64 10.17 9.78 10.18 12.39 10.22 11.03 10.22 8.00 10.22 11.90 10.18 8.68 10.50 7.25 10.23 13.46 10.03 10.19 10.23 9.93 RUN; *----ORDINARY LEAST SQUARES REGRESSION---; PROC REG DATA=ONE; MODEL Y = X /SPEC; OUTPUT OUT=OUT1 P=PREDICT R=RESIDUAL; PROC PLOT DATA=OUT1; PLOT RESIDUAL*PREDICT='*' / VREF=0 HPOS=60 VPOS=25; RUN; *----VARIANCE OF Y FOR EACH X GROUP----; W = 1/(1.5329-(0.7334*X) +(0.0883*X**2)); RUN; And get the following error in the log: 1 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; 55 56 OPTION PS=62 LS=80; 57 DATA ONE; 58 INPUT X Y; 59 CARDS; NOTE: The data set WORK.ONE has 35 observations and 2 variables. NOTE: DATA statement used (Total process time): real time 0.00 seconds cpu time 0.02 seconds 95 RUN; 96 *----ORDINARY LEAST SQUARES REGRESSION---; 97 PROC REG DATA=ONE; 98 MODEL Y = X /SPEC; 99 OUTPUT OUT=OUT1 P=PREDICT R=RESIDUAL; NOTE: The data set WORK.OUT1 has 35 observations and 4 variables. NOTE: PROCEDIMIENTO REG used (Total process time): real time 5.57 seconds cpu time 0.44 seconds 100 PROC PLOT DATA=OUT1; 101 PLOT RESIDUAL*PREDICT='*' / VREF=0 HPOS=60 VPOS=25; 102 RUN; 103 *----VARIANCE OF Y FOR EACH X GROUP----; 104 W = 1/(1.5329-(0.7334*X) +(0.0883*X**2)); _ 180 NOTE: The previous statement has been deleted. ERROR 180-322: Statement is not valid or it is used out of proper order. 105 RUN; 106 107 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; 119 How can I gew my variable "W"? Best, Santiago
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