4 ms·

I'm glad to see another take on the data. I'm also relieved to see that our results are along the same lines! :) You say that "Red light violations" are automa

by rpicard 14y ago

I'm glad to see another take on the data. I'm also relieved to see that our results are along the same lines! :) You say that "Red light violations" are automated. That didn't even cross my mind! I just assumed that they were manually issued without even thinking about it. I think it'd make more sense that it would be referring to automated red-light cameras, but are you basing that on anything or did you just make the opposite assumption? I'd also just like to point out that I made an update yesterday with some more conventional statistics (standard deviation, Z-scores) and new weights accounting for days of the week. http://robert.io/posts/4.html#updates http://robert.io/posts/4.html#updates

glaugh 14y ago
Ah, I missed your update, thanks for posting that. I guess we can't be totally sure that the red light tickets in question are automated. But it seems pretty likely given that Baltimore does have automated red light ticketing (http://cityservices.baltimorecity.gov/parkingfines/ http://cityservices.baltimorecity.gov/parkingfines/), and this dataset seemed to only contain automated versions of moving violations (ie, it had mobile and fixed speed cameras but not policeman-in-a-cruiser speeding tickets). Also it's just a ton of red light tickets, and in my personal experience street cleaning or meter tickets feel way more common than manually dispensed red light tickets. I was a bit disappointed that this (and other datasets in Baltimore and SF) didn't have a codebook anywhere to explain the data. I'm guessing you weren't able to find one, either?
- rpicard 14y ago
  No, I wasn't able to find anything explaining the data either. I actually called a couple of offices to ask how complete it was, and nobody knew what to do with me. The first number I could find was the mayor's office. The person who answered transferred me to the DMV, and the lady who answered there had no idea what I was talking about and put me on hold. I hung up after a while. :/

by rpicard 14y ago

glaugh 14y ago

Ah, I missed your update, thanks for posting that. I guess we can't be totally sure that the red light tickets in question are automated. But it seems pretty likely given that Baltimore does have automated red light ticketing (http://cityservices.baltimorecity.gov/parkingfines/ http://cityservices.baltimorecity.gov/parkingfines/), and this dataset seemed to only contain automated versions of moving violations (ie, it had mobile and fixed speed cameras but not policeman-in-a-cruiser speeding tickets). Also it's just a ton of red light tickets, and in my personal experience street cleaning or meter tickets feel way more common than manually dispensed red light tickets. I was a bit disappointed that this (and other datasets in Baltimore and SF) didn't have a codebook anywhere to explain the data. I'm guessing you weren't able to find one, either?

rpicard 14y ago
No, I wasn't able to find anything explaining the data either. I actually called a couple of offices to ask how complete it was, and nobody knew what to do with me. The first number I could find was the mayor's office. The person who answered transferred me to the DMV, and the lady who answered there had no idea what I was talking about and put me on hold. I hung up after a while. :/