Description
Deficit Index (DI).
Description
A set of utilities for calculating the Deficit (frailty) Index (DI) in gerontological studies. The deficit index was first proposed by Arnold Mitnitski and Kenneth Rockwood and represents a proxy measure of aging and also can be served as a sensitive predictor of survival. For more information, see (i)"Accumulation of Deficits as a Proxy Measure of Aging" by Arnold B. Mitnitski et al. (2001), The Scientific World Journal 1, <DOI:10.1100/tsw.2001.58>; (ii) "Frailty, fitness and late-life mortality in relation to chronological and biological age" by Arnold B Mitnitski et al. (2001), BMC Geriatrics2002 2(1), <DOI:10.1186/1471-2318-2-1>.
README.md
di: an R package to calculate Deficit Index (DI)
Installation
devtools::install_github("izhbannikov/di")
Usage
library(di)
dd <- data.frame(subj=seq(1:100), var1=rbinom(100,1,.5), var2=rbinom(100,1,.5), var3=rbinom(100,1,.5))
ddi <- di(dd, c("var1", "var2", "var3"))
References
Arnold B. Mitnitski, Alexander J. Mogilner, and Kenneth Rockwood, “Accumulation of Deficits as a Proxy Measure of Aging,” TheScientificWorldJOURNAL, vol. 1, pp. 323-336, 2001. doi:10.1100/tsw.2001.58