Compute birth weight

Now let's pull together the steps in this chapter to compute the average birth weight for full-term babies.

I've provided a function, resample_rows_weighted, that takes the NSFG data and resamples it using the sampling weights in wgt2013_2015. The result is a sample that is representative of the U.S. population.

Then I extract birthwgt_lb1 and birthwgt_oz1, replace special codes with NaN, and compute total birth weight in pounds, birth_weight.

# Resample the data
nsfg = resample_rows_weighted(nsfg, 'wgt2013_2015')

# Clean the weight variables
pounds = nsfg['birthwgt_lb1'].replace([98, 99], np.nan)
ounces = nsfg['birthwgt_oz1'].replace([98, 99], np.nan)

# Compute total birth weight
birth_weight = pounds + ounces/16

Make a Boolean Series called full_term that is true for babies with 'prglngth' greater than or equal to 37 weeks.
Use full_term and birth_weight to select birth weight in pounds for full-term babies. Store the result in full_term_weight.
Compute the mean weight of full-term babies.

Exercise

Compute birth weight

Instructions