nipnTK (version 0.2.0)

ageChildren: Goodness of fit to an expected model-based age distribution

Description

A simple model-based method for calculating expected numbers using exponential decay in a population in which births and deaths balance each other and with a 1:1 male to female sex ratio. This function is built specifically to test goodness of fit for a sample of children aged 6-59 months old grouped into four 1 year age groups and 1 half year age group (6 to less than 18 months, 18 to less than 30 months, 30 to less than 42 months, 42 to less than 54 months, and 54 months to less than 60 months).

Usage

ageChildren(age, u5mr = 1)

Value

A list of class "ageChildren" with:

Variable	Description
u5mr	Under five years mortality rate as deaths / 10000 persons / day
observed	Table of counts in each (year-centred) age group
expected	Table of expected counts in each (year-centred) age group
X2	Chi-squared test statistic
df	Degrees of freedom for Chi-squared test
p	p-value for Chi-squared test

Arguments

age

A vector of ages. Should either be in whole months (integer) or in calculated decimal months (numeric).

u5mr

A numeric value for under five years mortality rate expressed as deaths / 10,000 persons / day. Default is set to 1.

Examples

# Chi-Squared test for age of children in dp.ex02 sample dataset using an
# u5mr of 1 / 10,000 / day.
svy <- dp.ex02
ac <- ageChildren(svy$age, u5mr = 1)
ac

# Apply function to each sex separately
# Males
acM <- ageChildren(svy$age[svy$sex == 1], u5mr = 1)
acM
# Females
acF <- ageChildren(svy$age[svy$sex == 2], u5mr = 1)

# Simplified call to function by sex
by(svy$age, svy$sex, ageChildren, u5mr = 1)