MAINT: remove 8-year-old commented-out code marked as being less accurate than KalmanFilter
MAINT: remove 8-year-old commented-out code marked as being less accurate than KalmanFilter

josef-pkt/statsmodels,ChadFulton/statsmodels,bashtage/statsmodels,ChadFulton/statsmodels,josef-pkt/statsmodels,jseabold/statsmodels,statsmodels/statsmodels,josef-pkt/statsmodels,statsmodels/statsmodels,jseabold/statsmodels,statsmodels/statsmodels,bashtage/statsmodels,jseabold/statsmodels,bashtage/statsmodels,statsmodels/statsmodels,statsmodels/statsmodels,ChadFulton/statsmodels,ChadFulton/statsmodels,ChadFulton/statsmodels,bashtage/statsmodels,statsmodels/statsmodels,bashtage/statsmodels,josef-pkt/statsmodels,bashtage/statsmodels,ChadFulton/statsmodels,josef-pkt/statsmodels,jseabold/statsmodels,josef-pkt/statsmodels,jseabold/statsmodels