index: Indexing a time series

In karsfri/HMSr: Theme and functions for HMS

Description

Scales a time series in such a way that it gets the value 100 at a given point in time

Usage

index(val, time_var, at_time = min(time_var[!is.na(val)], na.rm = TRUE))

Arguments

val	a numeric variable to scale
time_var	time variable or other indexing variable
at_time	the time or index value at the base year

Value

A scaled series.

Examples

economics_long %>%
 group_by(variable) %>%
 mutate(val = index(value, date))

karsfri/HMSr documentation built on Feb. 26, 2020, 10:36 a.m.