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hayd opened this issue Apr 4, 2015 · 0 comments
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Groupby mean transform not converting to float #9807

hayd opened this issue Apr 4, 2015 · 0 comments
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Bug Dtype Conversions Unexpected or buggy dtype conversions Groupby
Milestone
0.16.1

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@hayd
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hayd commented Apr 4, 2015 

In [11]: df = pd.DataFrame([[1, 3], [2, 3]])

In [12]: df.groupby(1).transform('mean')
Out[12]:
   0
0  1
1  1

In [13]: df.groupby(1).mean()  # converts when it's a normal groupby mean
Out[13]:
     0
1
3  1.5

http://stackoverflow.com/a/29437332/1240268
@jreback jreback added Bug Groupby Dtype Conversions Unexpected or buggy dtype conversions labels Apr 4, 2015
@jreback jreback added this to the 0.16.1 milestone Apr 4, 2015
jcrist added a commit to jcrist/pandas that referenced this issue Apr 13, 2015
@jcrist
Groupby transform preserves output dtype
b97fd3a 
Previously `transform` output was always the same dtype as the groupby
object. This allows the output dtype to differ from the input. Fixes pandas-dev#9807.
@jcrist jcrist mentioned this issue Apr 13, 2015
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Bug Dtype Conversions Unexpected or buggy dtype conversions Groupby
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Groupby transform preserves output dtype jcrist/pandas
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