Addresses this email from CRAN:

> Dear maintainer,
>
> You have file 'lsasim/man/lsasim.Rd' with
> \docType{package}, likely intended as a package overview help file, but
> without the appropriate PKGNAME-package \alias as per "Documenting
> packages" in R-exts.
>
> This seems to be the consequence of the breaking change
>
>>   Using @doctype package no longer automatically adds a -package alias.
>>   Instead document _PACKAGE to get all the defaults for package
>>   documentation.
>
> in roxygen2 7.0.0 (2019-11-12) having gone unnoticed, see
> <r-lib/roxygen2#1491>.
>
> As explained in the issue, to get the desired PKGNAME-package \alias
> back, you should either change to the new approach and document the new
> special sentinel
>
>   "_PACKAGE"
>
> or manually add
>
>   @Aliases contingencytables-package
>
> if remaining with the old approach.
>
> Please fix in your master sources as appropriate, and submit a fixed
> version of your package within the next few months.