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InvisibleAphex
Co-Webmaster
Registered: 07/12/03
Posts: 170
Re: Where'd Negative Go?
    #197729 - 07/21/99 06:06 PM (17 years, 4 months ago)

That was from back in the old days of the rating script when reports that got too low were deleted. Since we don't use that anymore, the scale has been adjusted to go from 0 to 5. The ratings were all adjusted so nothing got out of kilter. Later.

------------------
Aphex
Webmaster of The Shroomery
Aphex@shroomery.org




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Invisiblemjshroomer
Sage
Registered: 07/22/99
Posts: 13,774
Loc: gone with my shrooms
Re: Where'd Negative Go?
    #197731 - 07/23/99 03:24 PM (17 years, 4 months ago)

Hey Aphex, I also am interested in what has happened on the trip reports. I have a trip report that has been rated 266 times since I submitted this report. It had a high rating and then all of a sudden it is listed as a 1.0 rating.

I ask this because I have been receiving really cool compliments on this trip report.

Did something happen when you changed servers?

Anyway keep up the good work.
mjshroomer



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InvisibleYthanA
٩(●̮•̃)۶
Male

Registered: 08/08/97
Posts: 16,833
Loc: NY/MA/VT Border, USA
Re: Where'd Negative Go?
    #197732 - 07/23/99 08:53 PM (17 years, 4 months ago)

Okay. This explanation is a little long, so bear with me.

When I was going through the trip report script to change the span of the ratings so that they go from 0 to 5 instead of -5 to 5, I noticed a serious problem with the way the ratings were computed when a new rating was submitted.

As you know, both the rating of a report and the number of people who have rated it are stored in our database. Previously, when someone rated a report, the new average rating was arrived at using the following formula:

newaveragerating = (oldaveragerating + newrating) / 2

Thus, if a report's average rating was 2 and someone gave it a rating of 4, the new rating would be 3, or (2 + 4) / 2. This was true no matter how many times the report had been rated. If it been given a rating of '2' 1,000 times, and then a single person came along and gave it a rating of 4, the new average rating would be changed to 3. Obviously, this isn't correct. If a report has been rated 1,000 times, then a single rating will have a negligible effect on the average.

So, when I changed the rating span, I also fixed this problem. We now use the following formula to arrive at the average rating:

newaveragerating = (timesreportrated * oldaveragerating + newrating) / (timesreportrated + 1)

This means that the average rating of a report is now reflected accurately. If a report has been given a '2' rating 1,000 times and a single person comes along and gives it a rating of '4', the average rating will remain very very close to 2 (2.004, to be exact). So it's fixed now, but I think it's likely that in the past one or two people gave your report a low rating and that's why its rating appears lower than it should. In time, as your report receives more and more ratings, the score will be more accurately reflected. Sorry about all this. :smile:

------------------
Ythan
Founder of the Shroomery



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Invisiblemjshroomer
Sage
Registered: 07/22/99
Posts: 13,774
Loc: gone with my shrooms
Re: Where'd Negative Go?
    #197733 - 07/24/99 08:31 AM (17 years, 4 months ago)

Thanks Ythan for the imput but Its all greek to me. I"m sorry I am really computer illeterate. But whatever. Its all ok. I didn't expect such a deep retrospective answer to my question but thanks alot for the reply. I appreciate it.

Anyway have a great day
Mjshroom



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Anonymous

Re: Where'd Negative Go?
    #197734 - 07/26/99 01:43 AM (17 years, 4 months ago)

oh dear god, my mind just quit working!


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