[Rd] broken link to Titanic data

[Ben Bolker]

This URL, which appears in the ?Titanic web page:

 https://www.amstat.org/publications/jse/v3n3/datasets.dawson.html

gives me a 404 error.  Googling "Dawson titanic data" gives

ww2.amstat.org/publications/jse/v3n3/datasets.dawson.html

which is similarly broken.

  Poking around gives this preferred reference URL to the original
article on Taylor & Francis's site:

https://doi.org/10.1080/10691898.1995.11910499

This article is free to access, but it doesn't appear that it's possible
to access the original "titanic.dat.txt" through T&F's web site.  It is
on the internet archive ...

https://web.archive.org/web/20180323070125/https://ww2.amstat.org/publications/jse/datasets/titanic.dat.txt

The codebook is at

https://web.archive.org/web/20180405163149/http://ww2.amstat.org:80/publications/jse/datasets/titanic.txt

  I can submit this as a bug report if that's recommended ...

  Ben Bolker