Parameterized reports in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a parameterized report in R?

A parameterized report is a report that takes input values (parameters) to customize the output dynamically based on user input or other variables.

beginner

How do you pass parameters to an R Markdown report?

You define parameters in the YAML header using the 'params' field, then access them in the report using 'params$parameter_name'.

beginner

Example YAML header snippet to define a parameter named 'region' with default value 'North'.

params: region: "North"

intermediate

How can you render an R Markdown report with a specific parameter value from R code?

Use the rmarkdown::render() function with the 'params' argument, e.g., rmarkdown::render('report.Rmd', params = list(region = 'South')).

beginner

Why are parameterized reports useful?

They allow creating flexible reports that adapt to different inputs without rewriting code, saving time and reducing errors.

Where do you define parameters in an R Markdown report?

A Inside the R code chunks

B In the global environment only

C In the output format section

D In the YAML header under 'params'

Parameters are defined in the YAML header under the 'params' field.

How do you access a parameter named 'year' inside an R Markdown document?

A params$year

B year

C input$year

D param.year

Parameters are accessed using 'params$parameter_name', so 'params$year' is correct.

Which function is used to render an R Markdown report with parameters from R code?

A knitr::knit()

B rmarkdown::render()

C shiny::runApp()

D library()

rmarkdown::render() is used to generate reports and can accept parameters.

What is the benefit of using parameterized reports?

A They allow dynamic report customization without changing code

B They make reports run faster

C They automatically fix errors

D They remove the need for R code

Parameterized reports let you customize output dynamically without rewriting code.

If you want to change the default value of a parameter, where do you do it?

A In the output format section

B Inside the R code chunk

C In the YAML header under 'params'

D In the console only

Default parameter values are set in the YAML header under 'params'.

Explain how to create and use a parameter in an R Markdown report.

Think about where parameters live and how you call them inside the report.

Describe the steps to render an R Markdown report with a custom parameter value from R code.

Focus on the function and how parameters are passed.