read_erp function

[fmarkham]

As per issue 260, this pull request contains a function that simplifies accessing ERPs for states and territories by age group and sex. The motivating use case is to access ERPs for those aged 18 or over, which isn't published in an easily accessible series as far as I know.

I'm not an experienced package author, so you may wish to review the code.

[MattCowgill]

Thanks @fmarkham, will review when I can (hopefully this week)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 52 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
R/read_erp.R	0.00%	52 Missing ⚠️

Additional details and impacted files

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##             read_erp     #261   +/-   ##
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[MattCowgill]

Hey @fmarkham this is fantastic! Thanks so much. I'm going to merge it into a branch, then add some unit tests, then go to master.

[MattCowgill]

@fmarkham the output doesn't have an age column - I assume that's a mistake?

[fmarkham]

It was intentional as the motivating use case (get the population aged 18 plus by state and sex over time) doesn't require age in single years to be returned.

But this is more general and perhaps in keeping with the style of read_abs so I don't really mind. It simple enough to do an additional group_by on the results.

Thanks for refactoring the code, learnt a few things looking at your edits :)