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from __future__ import print_function, division
import nsfg3
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df = nsfg3.ReadFemResp2010()
len(df)
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df.evrmarry.value_counts()
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len(df[(df.cmbirth >= 522) & (df.cmbirth <= 1278)])
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len(df[(df.cmmarrhx >= 522) & (df.cmmarrhx <= 1278)])
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len(df[(df.cmmarrhx.isnull())])
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df.cmintvw.value_counts().sort_index()
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df.finalwgt.value_counts().sort_index()
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