I tried to create a dataset of 200 individuals. There are 4 variables in the dataset, y, x1, x2, and x3. The value of y is predicted from x1, x2, and x3. There are also some correlations among x1, x2, and x3. I created the following SAS syntax. However, I got error messages and could not create the dataset. Would you please help me to see what went wrong here? Thank you in advance! /* Set the number of individuals */ %let num_individuals = 200; /* Set the correlation matrix */ %let correlation_matrix = 1, 0.5, 0.3, 0.5, 1, 0.2, 0.3, 0.2, 1; /* Create the dataset */ data my_dataset; array x[3] x1-x3; call streaminit(12345); /* Set the seed for random number generation */ /* Generate correlated values for x1, x2, and x3 */ do i = 1 to &num_individuals; x = rand("Multinormal", 0, &_correlation_matrix); /* Generate correlated values */ x1 = x[1]; x2 = x[2]; x3 = x[3]; /* Calculate the value of y using x1, x2, and x3 */ y = 2 * x1 + 3 * x2 - 4 * x3 + rand("Normal", 0, 0.5); /* Add some random noise to the prediction */ output; /* Output the current observation */ end; keep y x1 x2 x3; /* Keep only the specified variables */ run; /* Print the dataset */ proc print data=my_dataset; run; I got the following error message: 214 %let num_individuals = 200; 215 216 /* Set the correlation matrix */ 217 %let correlation_matrix = 1, 0.5, 0.3, 218 0.5, 1, 0.2, 219 0.3, 0.2, 1; 220 221 /* Create the dataset */ 222 data my_dataset; 223 array x[3] x1-x3; 224 call streaminit(12345); /* Set the seed for random number generation */ 225 226 /* Generate correlated values for x1, x2, and x3 */ 227 do i = 1 to &num_individuals; 228 x = rand("Multinormal", 0, &_correlation_matrix); /* Generate correlated values */ - 22 WARNING: Apparent symbolic reference _CORRELATION_MATRIX not resolved. ERROR: Illegal reference to the array x. ERROR 22-322: Syntax error, expecting one of the following: a name, a quoted string, a numeric constant, a datetime constant, a missing value, INPUT, PUT. 229 x1 = x[1]; 230 x2 = x[2]; 231 x3 = x[3]; 232 233 /* Calculate the value of y using x1, x2, and x3 */ 234 y = 2 * x1 + 3 * x2 - 4 * x3 + rand("Normal", 0, 0.5); /* Add some random noise to the 234! prediction */ 235 236 output; /* Output the current observation */ 237 end; 238 keep y x1 x2 x3; /* Keep only the specified variables */ 239 run; NOTE: The SAS System stopped processing this step because of errors. WARNING: The data set WORK.MY_DATASET may be incomplete. When this step was stopped there were 0 observations and 4 variables. WARNING: Data set WORK.MY_DATASET was not replaced because this step was stopped.
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