le, the program prints an error message to stderr and returns a non-zero return code. For example, the model <code>bernoulli.stan</code> defines two data variables <code>N</code> and <code>y</code>. If the input data file doesn’t include both variables, or if the data variable doesn’t match the declared type and dimensions, the program will exit with an error message at the point where it first encounters missing data.</p>
<p>For example if the input data file doesn’t include the definition for variab