Update ktrx.py (#540)

orbit/models/ktrx.py

@@ -73,7 +73,7 @@ class BaseKTRX(BaseTemplate):
     date_freq : str
         date frequency; if not supplied, pd.infer_freq will be used to imply the date frequency.
     min_residuals_sd : float
-        a numeric value from 0 to 1 to indicate the upper bound of residual scale parameter; e.g.
+        a numeric value from 0 to 1 to indicate the lower bound of residual scale parameter; e.g.
         0.5 means residual scale will be sampled from [0, 0.5] in a scaled Beta(2, 2) dist.
     flat_multiplier : bool
         Default set as True. If False, we will adjust knot scale with a multiplier based on regressor volume
@@ -110,7 +110,7 @@ def __init__(self,
                  mvn=0,
                  flat_multiplier=True,
                  geometric_walk=False,
-                 min_residuals_sd=1.0,
+                 min_residuals_sd=0.1,
                  **kwargs):
         super().__init__(**kwargs)  # create estimator in base class