def is_instance(obj, klass):
    return issubclass(type(obj), klass)
estimated coefficients for exogeneous variables or fixed effects
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/unittest/test/testmock/support.py/is_instance--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/sandbox/panel/mixed.py/OneWayMixed.params