| Type: | Package |
| Title: | Deficit Index (DI) |
| Version: | 1.1.4 |
| Date: | 2018-04-11 |
| Maintainer: | Ilya Y. Zhbannikov <ilya.zhbannikov@duke.edu> |
| 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>. |
| RoxygenNote: | 6.0.1 |
| Suggests: | knitr, rmarkdown |
| VignetteBuilder: | knitr |
| Imports: | scales |
| Depends: | R (≥ 3.3) |
| Encoding: | UTF-8 |
| License: | GPL-3 |
| NeedsCompilation: | no |
| Packaged: | 2018-04-11 05:16:39 UTC; ilya |
| Author: | Ilya Y. Zhbannikov [aut, cre] |
| Repository: | CRAN |
| Date/Publication: | 2018-04-11 05:24:20 UTC |
This function calculates the Deficit Index (DI) and returns results
as list: di a column-vector containing
deficit indexes for each individual and
columns that were used to calculate the di.
Description
This function calculates the Deficit Index (DI) and returns results
as list: di a column-vector containing
deficit indexes for each individual and
columns that were used to calculate the di.
Usage
di(dat, cols = NULL, invert = NULL, rescale = TRUE, age = NULL,
rescale.custom = NULL, rescale.avoid = NULL, bins = 7,
visible = FALSE)
Arguments
dat |
A data frame. Required parameter. |
cols |
A list of column names.
Default: |
invert |
A list of columns which have to be inverted.
Default: |
rescale |
A flag that tell the program to rescale columns
if the values a not 0/1. Default: |
age |
A name of column which represents age of a patient.
Default: |
rescale.custom |
A custom rescaling. See example below.
Default: |
rescale.avoid |
A set of column names for which rescaling should be avoided.
Default: |
bins |
A number of bins for plotting the DI against age from a dataset.
Default: |
visible |
A flag to show DI plot (mean DI in a population by age)
Default: |
Value
A list of two: di a column-vector containing
deficit indexes for each individual and
columns (rescaled if flag rescale was set to TRUE)
that were used to calculate the di.
Examples
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"))
# Cusom rescaling
ddi <- di(dd, c("var1", "var2", "var3"), rescale.custom=c("var1:0.1:0.5"))
ddi