nhanes: US National Health and Nutrition Examination Study

In ssmodels: Sample Selection Models

US National Health and Nutrition Examination Study

Description

The US National Health and Nutrition Examination Study (NHANES) is a survey data collected by the US National Center for Health Statistics. The survey data dates back to 1999, where individuals of all ages are interviewed in their home annually and complete the health examination component of the survey. The study variables include demographic variables (e.g. age and annual household income), physical measurements (e.g. BMI – body mass index), health variables (e.g. diabetes status), and lifestyle variables (e.g. smoking status). This data frame contains the following columns:

• id: Individual identifier

• age: Age

• gender: Sex 1=male, 0=female

• educ: Education is dichotomized into high school and above versus less than high school

• race: categorical variable with five levels

• income: Household income ($1000 per year) was reported as a range of values in dollar (e.g. 0–4999, 5000–9999, etc.) and had 10 interval categories.

• Income: Household income ($1000 per year) was reported as a range of values in dollar (e.g. 0–4999, 5000–9999, etc.) and had 10 interval categories.

• bmi: body mass index

• sbp: systolic blood pressure

Usage

nhanes

Format

An object of class data.frame with 9643 rows and 9 columns.

Source

https://wwwn.cdc.gov/nchs/nhanes/ContinuousNhanes/Default.aspx?BeginYear=2003

References

\insertRef

ogundimu2019robustssmodels

\insertRef

little2011subsamplessmodels

\insertRef

ssmrobssmodels

\insertRef

sampleSelectionssmodels

Examples

data("nhanes")
attach(nhanes)
hist(Income, prob= TRUE, breaks = seq(1, 99, 0.5), xlim = c(1,10),
ylim = c(0,0.35), main = "Histogram of Income", xlab = "Category")
data2 <- subset(nhanes, !is.na(sbp))
data3 <- subset(data2, !is.na(bmi))
attach(data3)
data <- data3
data$YS <- ifelse(is.na(data$Income),0,1)
data$educ <- ifelse(data$educ<=2,0,1)
attach(data)
selectionEq <- YS~age+gender+educ+race
outcomeEq   <- sbp~age+gender+educ+bmi

ssmodels documentation built on Oct. 4, 2022, 5:06 p.m.