datetime - python pandas: trying to reference data from another column's previous month end -


i trying create column in dataframe references value in column previous month end. this...

date	        sd	sd.prevmo  02/29/00	0.0312	0.0312  03/01/00	0.0304	0.0312  03/02/00	0.0293	0.0312  03/03/00	0.0287	0.0312  		  03/28/00	0.0502	0.0312  03/29/00	0.0526	0.0312  03/30/00	0.0537	0.0312  03/31/00	0.0556	0.0556  04/03/00	0.0507	0.0556  04/04/00	0.0532	0.0556  04/05/00	0.0536	0.0556

the dateoffset functionality including bmonthend() seems have answer in must butchering that's not terribly complex.

df.ix[df.index.is_month_end==true, sd.prevmo] = df[sd] df.ix[df.index.is_month_end==false, sd.prevmo] = ???

has run before?

after set values is_month_end==true df['sd'], can full nas ffill methiod - forward fills values.

in [10]: df.ix[df.index.is_month_end==true, 'sd.prevmo'] = df['sd'] in [11]: df['sd.prevmo'].fillna(method='ffill') out[11]: date 2000-02-29    0.0312 2000-03-01    0.0312 2000-03-02    0.0312 2000-03-03    0.0312 2000-03-28    0.0312 2000-03-29    0.0312 2000-03-30    0.0312 2000-03-31    0.0556 2000-04-03    0.0556 2000-04-04    0.0556 2000-04-05    0.0556 name: sd.prevmo, dtype: float64

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