Deficit Index (DI)

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, ; (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), .


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

News

New for version 1.1.4

  • Version released.
  • Warning "Note: break used in wrong context: no loop is visible" fixed.
  • Vignette updated.

Reference manual

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install.packages("di")

1.1.4 by Ilya Y. Zhbannikov, a year ago


Browse source code at https://github.com/cran/di


Authors: Ilya Y. Zhbannikov [aut, cre]


Documentation:   PDF Manual  


GPL-3 license


Imports scales

Suggests knitr, rmarkdown


See at CRAN