SF36rec: Short Form-36 Health Survey (SF-36) Recode
In idaejin/HRQoL: Health Related Quality of Life Analysis

Description Usage Arguments Details Value Author(s) References Examples

The SF36rec function recodes the Short Form-36 Health Survey (SF-36) dimensions into binomial data, based on Arostegui et al. (2013).

1	SF36rec(x,k)

x

The SF-36 dimension to be recoded, it must be numeric and bounded between 0 and 100.

k

An integer from 1 to 8, indicating the SF-36 dimension of x. These are the dimensions depending on the k value ordered as follows:

k=1 -> Role Physical

k=2 -> Role Emotional

k=3 -> Physical Functioning

k=4 -> Vitality

k=5 -> Social Functioning

k=6 -> Body Pain

k=7 -> General Health

k=8 -> Mental Health

Each observation of the HRQoL measured by the SF-36 is divided in eight domains, and each domain refers to an especific aspect of the HRQoL: Role Physical, Role Emotional, Physical Functioning, Vitality, Social Functioning, Body Pain, General Health and Mental Health. This domains are bounded between 0 and 100, and each domain can only take some values. This function recodes the SF-36 domains based on the method proposed in Arostegui et al. (2013) for the beta-binomial regression analysis.

The dimension recoded to binomial data.

Josu Najera Zuloaga

Dae-Jin Lee

Arostegui I., Nuñez-Antón V. & Quintana J. M. (2013): On the recoding of continuous and bounded indexes to a binomial form: an application to quality-of-life scores, Journal of Applied Statistics, 40:3, 563-583

Arostegui I., Nuñez-Antón V. & Quintana J. M. (2006): Analysis of short-form-36 (SF-36): The beta-binomial distribution approach, Statistics in Medicine, 26, 1318-1342

set.seed(2)
#We simulate a variable bounded between 0 and 100, and that only can take some values.
BodyPain <- rnorm(1000,50,15)
k <- 6  # k=6 is Body Pain
BodyPain.rec <- SF36rec(BodyPain,k)