Merge pull request #3103 from aloctavodia/scale

StudentT: Clarify meaning of scale parameters

Author: fonnesbeck

pymc3/distributions/continuous.py

@@ -1609,9 +1609,11 @@ class StudentT(Continuous):
     mu : float
         Location parameter.
     sd : float
-        Standard deviation (sd > 0) (only required if lam is not specified)
+        Scale parameter (sd > 0). Converges to the standard deviation as nu
+        increases. (only required if lam is not specified)
     lam : float
-        Precision (lam > 0) (only required if sd is not specified)
+        Scale parameter (lam > 0). Converges to the precision as nu
+        increases. (only required if sd is not specified)
 
     Examples
     --------