tag:blogger.com,1999:blog-3722233.post6303408530556140859..comments2020-01-20T07:37:42.239-05:00Comments on Computational Complexity: Statistics on my dead cat policy- is there a correlation?Lance Fortnowhttp://www.blogger.com/profile/06752030912874378610noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-3722233.post-21495868418986232912017-09-09T04:00:04.847-04:002017-09-09T04:00:04.847-04:00As here homework marks aren't counted to the c...As here homework marks aren't counted to the course grade, I go for: late homeworks will be marked last, the closer it comes to class the less comments I will give and the less the student will get out of the marking.Petehttps://www.blogger.com/profile/02123359695496629332noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-8809660250988388942017-09-09T00:46:16.438-04:002017-09-09T00:46:16.438-04:00RE: 3 -- I suspect students *driven by the intenti...RE: 3 -- I suspect students *driven by the intention* to actually hand HWs in on Tuesdays will out-perform themselves in an alternative world where the same students have no such explicit drive. Does this mean I disagree with your assumption about correlations? Who cares -- figure out how to appropriately measure this phenomenon in future courses!Daniel Aponhttps://www.youtube.com/watch?v=pRWjLLpwnOMnoreply@blogger.comtag:blogger.com,1999:blog-3722233.post-51698558623569167772017-09-08T14:23:00.919-04:002017-09-08T14:23:00.919-04:00I had your policy in the past, but found that, rel...I had your policy in the past, but found that, reliably as clockwork, it caused about a third of the A students to skip the last few assignments, who would then (also reliably as clockwork) bomb the related questions on the final. <br /><br />And, it seemed not to stem the flow of requests for late homework, as many students mentally translated the policy to "I'm supposed to choose three homeworks to skip, and if something bad happens I can ask for leniency on a fourth homework". <br /><br />I agree it's an equally reasonable policy (it fact yours is far MORE lenient than my current policy), but somehow it gets interpreted much differently by my students and so doesn't have a equal effect on their incentives.Dave Dotyhttp://web.cs.ucdavis.edu/~doty/noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-1780488170758148152017-09-08T06:26:59.663-04:002017-09-08T06:26:59.663-04:00I've always used the following policy:
No lat...I've always used the following policy:<br /><br />No late homework. The deadline is the deadline.<br /><br />But I'll drop the 3 lowest assignments. If something happens that means missing more than 3 homework assignments, come talk to me.Jeff Ericksonhttps://www.blogger.com/profile/17633745186684887140noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-87251105669329276782017-09-07T19:59:32.818-04:002017-09-07T19:59:32.818-04:00I have used the following policy: assignment is du...I have used the following policy: assignment is due on Friday 8PM (don't waste students' weekend doing assignment), if it is late by t their mark will be multiplied by 1-(t/2 days).<br /><br />Works very well, never got any request for an extension.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3722233.post-32641369325420991072017-09-07T15:52:09.338-04:002017-09-07T15:52:09.338-04:00Beautiful! Yours is very much like the one I descr...Beautiful! Yours is very much like the one I describe in messymatters.com/deadlines<br /><br />And, yeah, a big advantage of both our schemes is eliminating the discontinuities so, as I put it in that post, there's no quibbling about what fluke technical difficulty delayed submission at some critical moment.<br /><br />Btw, my original formula didn't get to 100% penalty until a week out but you can parameterize it like so:<br /><br />Penalty for being t seconds late = 1-(t/g)^4 where g is how many seconds until the penalty should hit 100%.<br /><br />Also that exponent can be tweaked to give something very much like your function but continuously differentiable. Visually it seems to match yours pretty well with an exponent of 2.6 or so. Call it e for roundness' sake.<br /><br />https://www.dropbox.com/s/thok9ukhfa7y2qr/late-function.png?raw=1<br /><br />PS: One more advantage of my smoother function (and higher exponent) is it replicates Bill's original idea of an automatic grace period. There's the nominal (moral, as Bill calls it) deadline but you can go a couple days and still get >99% credit.<br />dreeveshttps://www.blogger.com/profile/13007296061332653169noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-86079919757573410742017-09-07T15:07:06.639-04:002017-09-07T15:07:06.639-04:00Hi dreeves:
It seems we independently converged o...Hi dreeves:<br /><br />It seems we independently converged on the idea of a continuous late penalty!<br /><br />I actually considered something smooth like yours at first, but decided it would be easier to explain two linear pieces to the students. However, I think they should have similar incentives, especially because of the property that the slope is more gradual at first and increases at time passes.<br /><br />--DaveDave Dotyhttp://web.cs.ucdavis.edu/~doty/noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-78418513805644746072017-09-07T14:56:57.429-04:002017-09-07T14:56:57.429-04:00My late penalty is a continuous piecewise linear f...My late penalty is a continuous piecewise linear function of (submission_time - due_time): https://www.dropbox.com/s/ru0qxfns0lfueb6/late-penalty-120-plot.png<br /><br />The two pieces are a slowly-increasing late penalty for the first 12 hours, followed by a fast-increasing late penalty for the next 12 hours. For example, <br /><br />3 hours late: 2.5% off,<br />6 hours late: 5% off,<br />9 hours late: 7.5% off,<br />12 hours late: 10% off,<br />15 hours late: 32.5% off,<br />18 hours late: 55% off, <br />21 hours late: 77.5% off, <br />24 hours late: 100% off.<br /><br />If I knew more game theory, I could prove this works, but right now it's just intuition. The continuity of the penalty function is necessary: I think any sharp cutoffs (e.g., 25% off for each full day late) introduce incentive to complain about just barely missing a point of discontinuity.<br /><br />In a class of 72 students, I had no requests for late submissions the entire term, and one student THANKED me for the policy. (!!!)Dave Dotyhttp://web.cs.ucdavis.edu/~doty/noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-71125339666612603302017-09-07T14:37:31.443-04:002017-09-07T14:37:31.443-04:00(Try again with less typos- thats why I removed)
...(Try again with less typos- thats why I removed)<br /><br />1) Barfing cat! Wow- I'm surprised my examples is so close to someone else's example. More on that later.<br /><br />2) LIKE your hw policy. Has the advantage of also teaching the students some math to understand the penalty function. <br /><br />3) The stereotypical excuse used to be `my dog ate my HW' (When it really happened to Bart Simpsons he said ``I didn't know dogs could really do that'') This excuse seems to have gone out of fashion in the electronic age. GASARCHhttps://www.blogger.com/profile/06134382469361359081noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-54673940033118020442017-09-07T14:32:51.678-04:002017-09-07T14:32:51.678-04:00This comment has been removed by the author.GASARCHhttps://www.blogger.com/profile/06134382469361359081noreply@blogger.comtag:blogger.com,1999:blog-3722233.post-88348287056025692772017-09-07T14:19:33.111-04:002017-09-07T14:19:33.111-04:00Ha, we use the slightly less morbid term "bar...Ha, we use the slightly less morbid term "barfing cats excuse" with Beeminder. Eg, http://forum.beeminder.com/t/weasels-and-barfing-cats/3229<br /><br />And here's what I've used for a late homework policy: http://messymatters.com/deadlines/<br />It has a similar idea for avoiding making judgment calls about what excuses are legit.dreeveshttps://www.blogger.com/profile/13007296061332653169noreply@blogger.com