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 609a78b6dc9cd98a1d228110e533c396578d996d..2b4f7c9069000705425e7c6af8940e0cccb1315a 100644 (file)
--- a/src/math/linreg.c
+++ b/src/math/linreg.c
@@ -626,7 +626,7 @@ 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,