Remove outliers in Pandas dataframe with groupby

Question

I have a dataframe of Report Date, Time Interval and Total Volume for a full year. I would like to be able to remove outliers within each Time Interval.

This is as f

Answer 1

df[df.groupby("ReportDate").TotalVolume.\
      transform(lambda x : (x(x.quantile(0.05)))).eq(1)]
Out[1033]: 
      ReportDate  TimeInterval  TotalVolume
5785  2016-03-01            25        580.0
5786  2016-03-01            26        716.0
5787  2016-03-01            27        803.0