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(This article was first published on <strong><a href="http://shape-of-code.coding-guidelines.com/2017/11/26/data-set-update-to-empirical-software-engineering-using-r/"> The Shape of Code » R</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
<p>The pile of papers, books and data-sets, relating to previously released draft chapters of my <a rel="nofollow" href="http://www.knosof.co.uk/ESEUR" target="_blank">Empirical software engineering book</a>, has been growing, and cluttering up my mind. I decided to have a clear-out.</p>
<p>A couple of things stood out.</p>
<p>There are around 25 data-sets that have been promised but not yet arrived. If you encounter anybody who mentions they promised to send me data, please encourage them to spend some time doing this. I don’t want to add a new category, promised but never delivered, to the <a rel="nofollow" href="http://shape-of-code.coding-guidelines.com/2017/02/02/i-have-been-reading-your-interesting-paper/" target="_blank">list of email responses</a>.</p>
<p>There has been an increase in data-sets not being used because I already have <a rel="nofollow" href="http://shape-of-code.coding-guidelines.com/2017/11/03/huge-effort-data-set-for-project-phases/" target="_blank">something better</a>. This is a good sign, data quality is increasing. One consequence is that a growing number of ‘historical’ data-sets have fallen by the wayside. This is a good thing, most data-sets analysed in papers are very low quality and only used because nothing else was available. </p>
<p>One of my reasons for making draft releases was to prompt people to suggest data I had missed. This has not happened yet; come on people, suggest some data I don’t yet know about.</p>
<p>About a third of the pile got included in the <a rel="nofollow" href="http://www.knosof.co.uk/ESEUR" target="_blank">latest draft</a>, a third had been superseded by something better, and a third are still waiting for promised data.</p>
<p>Now, back to the reliability chapter.</p>
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