Assertions and conditional text in RMarkdown documents

[MattForshaw]

Hi Philip,

Based on our conversations at the ANNE conference, I thought we could add an additional exercise to cover...

• Adding assertions within RMarkdown documents to prevent a drift between narrative and data (e.g. when a year-on-year increase becomes a decrease).
• Constructing text in a narrative conditional on the data.

I propose this become Exercise 8, rather than making Exercise 5 more complex.

Welcome your thoughts before I embark on this.

Best wishes,
Matt

[philipdarke]

That would be a good addition, using assertthat? To keep it simple we could add a constant pv_previous = 5000000 say and compare it to the calculated pv_central - the narrative could then be "The present value is higher/lower than in our previous report"?

Agree we should add as exercise 8. Exercise 9 could be documentation with roxygen2 - I must get around to that at some point...