<div dir="ltr"><div dir="auto"><div dir="ltr"><div dir="ltr">Hi Kristofer!<div><br></div><div>Sorry for the delayed reply. I agree that formal verification would be more rigorous. I don't know how to do formal verification either, but I would be open to collaborating with someone who had experience doing it.</div><div><br></div><div>I'm glad you are excited about the idea of a collection of implementation-independent tests! A few different Pivot Libre projects have been using one format for ranked ballots and ranked results. I posted a draft specification of the format here:</div><div><a href="https://pivot-libre.github.io/bff/" rel="noreferrer" target="_blank">https://pivot-libre.github.io/bff/</a><br></div><div><br></div><div>Folks who are handy with git and GitHub are welcome to discuss and propose changes to the source file here: </div><div><a href="https://github.com/pivot-libre/pivot-libre.github.io/blob/master/bff.md" rel="noreferrer" target="_blank">https://github.com/pivot-libre/pivot-libre.github.io/blob/master/bff.md</a><br></div><div>I'm also open to discussing it over email; either on the list or privately.<br></div><div><br></div><div>Some of the many open questions:</div><div> * Should the spec say something about how head-to-head matchup matrices are encoded? If it's relevant to include, I'm hoping something standard like a JSON array or map could be used so that we don't have to write a parser, but I'm open to other ideas.</div><div><br></div><div> * Should the ballots and the expected result (and possibly the head-to-head matchup matrix) for a single test election all be in one file together? All in separate files?</div><div><br></div><div> * What lessons can be learned from previous attempts to standardize in this space? Most notably Election Markup Language <a href="https://en.wikipedia.org/wiki/Election_Markup_Language" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/Election_Markup_Language</a> .</div><div><br></div><div>One of our group members had a somewhat similar idea to you about generating random ballots. His work-in-progress tool generates random graphs with a Condorcet winner and then calculates the BFF ballots needed to generate such a graph.<br></div><div><div><a href="https://github.com/pivot-libre/ballot-gen" rel="noreferrer" target="_blank">https://github.com/pivot-libre/ballot-gen</a></div></div><div>He's not on this mailing list yet, so let me know if you want to be introduced.</div><div><br></div><div>Thanks for pointing me to Steve's examples, for pointing me to your program, and for drafting a few test ballots of your own! I admire the drive to create a useful test scenario with a minimal number of ballots. I'll be slower to reply to emails over the holidays, but I look forward to further discussion and collaboration!</div><div><br></div><div>Wishing you all the best,</div><div><br></div><div>Carl</div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Dec 19, 2018 at 4:07 PM Kristofer Munsterhjelm <<a href="mailto:km_elmet@t-online.de" rel="noreferrer" target="_blank">km_elmet@t-online.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 12/12/2018 21.20, Kristofer Munsterhjelm wrote:<br>
<br>
> I'd like to make a test set, but I've recently found myself rather short<br>
> on spare time, so I don't think I could contribute much, at least not at<br>
> the moment.<br>
<br>
Here's a test entry that I made while constructing a Smith,Minmax<br>
mono-add-top failure example with as few voters as possible:<br>
<br>
Election 1:<br>
<br>
8: B>D>A>C<br>
9: C>A>B>D<br>
3: C>D>A>B<br>
5: D>A>B>C<br>
<br>
The Smith set is {A, B, D}. C is the Plurality winner and also the<br>
Minmax winner. Schulze elects A.<br>
<br>
Election 2:<br>
<br>
8: B>D>A>C<br>
9: C>A>B>D<br>
3: C>D>A>B<br>
5: D>A>B>C<br>
1: A>B>C>D<br>
1: A>C>D>B<br>
<br>
The Smith set consists of all four candidates, and the outcomes should<br>
be the same.<br>
<br>
This is a Smith,Minmax failure example because C is automatically<br>
disqualified in the first election since C is not in the Smith set; but<br>
adding some A-first ballots gets C into the Smith set, after which it wins.<br>
<br>
Incidentally, I haven't been able to find a four-candidate Smith,Minmax<br>
failure example that also fails MAM. That might be a good challenge to<br>
either show impossible or to devise.<br>
<br>
Finally, there are example elections where every positional system<br>
except Plurality fails Majority. Could those be good test cases?<br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail-m_-4994260799778167992gmail-m_-3614492076979492480m_3946349464505181606gmail_signature"><br>Carl Schroedl | <a href="mailto:carlschroedl@gmail.com" rel="noreferrer" target="_blank">carlschroedl@gmail.com</a> | <a href="http://carlschroedl.com/blog" rel="noreferrer" target="_blank">http://carlschroedl.com/blog</a><br></div>