Return 0.0 for mean of a categorical variable. Fixes bug mentioned in bug report...

diff --git a/src/math/linreg.c b/src/math/linreg.c
index 8028697c6b7f3410b12927a0fe7ae1d82c5a6b4b..baf9cb737e8250b59a8814dac93dc5ca5b768390 100644 (file)
--- a/src/math/linreg.c
+++ b/src/math/linreg.c
@@ -641,7 +641,7 @@ double pspp_linreg_get_indep_variable_mean (pspp_linreg_cache *c, const struct v
       coef = pspp_linreg_get_coeff (c, v, NULL);
       return pspp_coeff_get_mean (coef);
     }
-  return GSL_NAN;
+  return 0.0;
 }
 
 void pspp_linreg_set_indep_variable_mean (pspp_linreg_cache *c, const struct variable *v,