remove outliers python pandas

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showing results for - "remove outliers python pandas"
Giovanna
25 Oct 2020
1#------------------------------------------------------------------------------
2# accept a dataframe, remove outliers, return cleaned data in a new dataframe
3# see http://www.itl.nist.gov/div898/handbook/prc/section1/prc16.htm
4#------------------------------------------------------------------------------
5def remove_outlier(df_in, col_name):
6    q1 = df_in[col_name].quantile(0.25)
7    q3 = df_in[col_name].quantile(0.75)
8    iqr = q3-q1 #Interquartile range
9    fence_low  = q1-1.5*iqr
10    fence_high = q3+1.5*iqr
11    df_out = df_in.loc[(df_in[col_name] > fence_low) & (df_in[col_name] < fence_high)]
12    return df_out
13
Cailin
24 Feb 2018
1cols = ['col_1', 'col_2'] # one or more
2
3Q1 = df[cols].quantile(0.25)
4Q3 = df[cols].quantile(0.75)
5IQR = Q3 - Q1
6
7df = df[~((df[cols] < (Q1 - 1.5 * IQR)) |(df[cols] > (Q3 + 1.5 * IQR))).any(axis=1)]
8
Pedro
05 Jun 2016
1cols = ['col_1', 'col_2'] # one or more
2
3Q1 = df[cols].quantile(0.25)
4Q3 = df[cols].quantile(0.75)
5IQR = Q3 - Q1
6
7df = df[~((df[cols] < (Q1 - 1.5 * IQR)) |(df[cols] > (Q3 + 1.5 * IQR))).any(axis=1)]
Elly
30 May 2019
1df = pd.DataFrame(np.random.randn(100, 3))
2
3from scipy import stats
4df[(np.abs(stats.zscore(df)) < 3).all(axis=1)]
5
Andrea
28 Aug 2017
1df[(df["col"] >= x ) & (df["col"] <= y )]
2
3but it's more readable to use:
4
5df[df["col"].between(x,y)]
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