I can't get the average or mean of a column in pandas. A have a dataframe. Neither of things I tried below gives me the average of the column weight
>>> allDF
ID birthyear weight
0 619040 1962 0.1231231
1 600161 1963 0.981742
2 25602033 1963 1.3123124
3 624870 1987 0.94212
The following returns several values, not one:
allDF[['weight']].mean(axis=1)
So does this:
allDF.groupby('weight').mean()
If you only want the mean of the weight column, select the column (which is a Series) and call .mean():
In [479]: df
Out[479]:
ID birthyear weight
0 619040 1962 0.123123
1 600161 1963 0.981742
2 25602033 1963 1.312312
3 624870 1987 0.942120
In [480]: df["weight"].mean()
Out[480]: 0.83982437500000007
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