Filtering out outliers in Pandas dataframe with rolling median

Question

I am trying to filter out some outliers from a scatter plot of GPS elevation displacements with dates

I\'m trying to use df.rolling to compute a median and standard

Answer 1

This is my take on creating a median filter:

def median_filter(num_std=3):
    def _median_filter(x):
        _median = np.median(x)
        _std = np.std(x)
        s = x[-1]
        return s if s >= _median - num_std * _std and s <= _median + num_std * _std else np.nan
    return _median_filter

df.y.rolling(window).apply(median_filter(num_std=3), raw=True)