Update pyomo/contrib/parmest/parmest.py

Co-authored-by: John Siirola <jsiirola@users.noreply.github.com>

Author: slilonfe5

pyomo/contrib/parmest/parmest.py

@@ -1685,7 +1685,7 @@ def _get_sample_list(self, samplesize, num_samples, replacement=True):
 
         return samplelist
 
-    def theta_est(self, solver="ef_ipopt", return_values=[], **kwargs):
+    def theta_est(self, solver="ef_ipopt", return_values=[], calc_cov=NOTSET, cov_n=NOTSET:
         """
         Parameter estimation using all scenarios in the data