This is an old piece I wrote a few years ago (late 2012), which I don't think I ever published. I couldn't be bothered to write up a conclusion, I think - it was pretty obvious anyway what to conclude.
Research in the age of sampling - dissecting the Frankenpaper
Around Halloween I came across a paper titled "Cost Effective Software Test Metrics", by Lazic et al. It appears to have been published in "WSEAS Transactions on Computers", in June 2008.
WSEAS is an organization whose academic standing is a little difficult to investigate; searching for its name will lead you to a number of blogs, for instance, that vigorously denounce other organizations for creating bogus conferences, sending spam, or defrauding researchers. The Shakespearean phrase "the lady doth protest too much" comes to mind.