Friction period: lookups in days/weeks (1-year vs 5-year average)"

In tatooheene: Technology Appraisal Toolbox for Health Economic Evaluations in the Netherlands

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.width = 7, fig.height = 4.2,
  dpi = 120
)
library(tatooheene)
library(dplyr)

What this vignette covers

• What the friction period is and where it lives in tatooheene::df_fp.
• How to use friction_period() to:
  • get weeks or days,
  • choose 1‑year vs 5‑year average, and
  • return either a table or a single value.

The function is r lifecycle::badge("experimental"). Column names reflect the CBS table embedded in df_fp.

The underlying data

df_fp %>%
  select(Year,
         `Friction period in days`,
         `Friction period days average over 5 years`,
         `Friction period in weeks`,
         `Friction period weeks average over 5 years`) %>%
  head()

Quick starts

1) Default: all years, weeks, 5‑year average

tatooheene::friction_period()

2) Specific year, weeks, 5‑year average → single value

tatooheene::friction_period(year = 2019, units = "weeks", avg = "5yr", output = "value")

3) Days, 1‑year values for a range of years

tatooheene::friction_period(year = 2018:2020, units = "days", avg = "1yr")

4) Multiple selections return multiple columns

tatooheene::friction_period(
  year  = 2015:2019,
  units = c("days", "weeks"),
  avg   = "1yr"       # try c("1yr","5yr") to get four columns
)

Error messages you might see

• "Year out of range …"\ You asked for a year outside range(df_fp$Year). Use a valid year or pass NULL for all years.

• "For output = "value", provide exactly one year and a single (units, avg) combination."\ Single value mode needs exactly one year and one (units, avg).

tatooheene documentation built on Dec. 15, 2025, 5:06 p.m.