2 commits, fix doc error, add skip_hessian
skip_hessian is for MixedLM (#1940) and most likely NegativeBinomial (see #1943 )
MixedLM savings are not large now because hessian in MixedLM is now analytic in master
fixing the rst error might close #1905 GEE not in online docs
Coverage increased (+0.0%) when pulling 35d8ffa on josef-pkt:misc into 9ce1605 on statsmodels:master.
DOC: GEE docstring rst error
ENH: base.LikelihoodModel.fit add skip_hessian option see #1943
REF: MixedLM fit skip_hessian (redundant calculation)
rebased and added skip_hessian to MixedLM
ready to merge when TravisCI is green
Coverage decreased (-0.01%) when pulling c06e615 on josef-pkt:misc into e6f2f70 on statsmodels:master.