## Introduction

This vignette describes how the variables.csv worksheet is organized and how to find variables that you can transform. See also the vignette variable_details.csv. The Get Started vignette provides examples of how to use the two worksheets.

Read variables.csv

#> There are 199 variables, grouped in 32 subjects and 6 sections that are available for
#>     transformation in CCHS cycles from 2001 to 2014.
#> You can search for variables in the table below. Try searching for the 6 age variables that are used in the Transform
#>     CCHS variables vignette. All 6 variables are in the age subject. Try sorting the subject column by clicking
#>     the up beside the subject heading: the top 6 rows of the table should show the age variables:
#> [1] "DHHGAGE_5"    "DHHGAGE_A"    "DHHGAGE_B"    "DHHGAGE_C"    "DHHGAGE_cont"
#> [6] "DHHGAGE_D"

## How the variables.csv sheet is organized

In each row there are 7 columns in this worksheet and they are as follows:

1. variable: the name of the final transformed variable.

2. label: the shorthand label for the variable.

3. labelLong: a more detailed label for the variable.

4. section: the section where this variable could be found (i.e. demographic, health behaviour, chronic diseases).

5. subject: what the variable pertains to (i.e. age, smoking, sex).

6. variableType: whether the final variable is categorical or continuous.

7. units: any units for the final variable.

8. databaseStart: the list of CCHS surveys that contain the variable of interest

9. variableStart: the original names of the variables as they are listed in each respective CCHS cycle

## Derived Variables

Derived variables follow the same naming conventions as CCHS variables when being listed in variables.csv.

## Contributing or customizing variables.csv

We recommend that you copy variables.csv with the variables that you use for your project. You can include only the variables that you use for your project, thereby providing a reference for your project. variables.csv is a CSV file to allow use cchsflow within teams that do not use R or have programming experience.

You can create your own transformed or derived variables by using the cchsflow variables.csv as a template. We welcome issues for comments to existing variables in `variables.csv. Also welcomed are PR for new transformations that you feel are helpful for others who use the CCHS data. See Contributing.