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Oct 2019
10:05am, 1 Oct 2019
8,844 posts
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larkim
Unexpectedly mine has dropped by 0.3 to 4.0 on Saturday after parkrun, then back up 0.1 on Monday to 4.1. The reason being that the 19:27 parkrun at the weekend scored a 3.3 which is a big deviation from my usual average. Conditions on the day were certainly not difficult, so I'm not entirely sure how that time achieved such a good score, but the algorithm about competitors on the day etc has clearly worked massively in my favour. In fact, it appears to be the lowest ever score I've achieved on RBR (4.8 before time bonus adjustments), despite being fair-to-middling as a run.
Your profile is really harshly scored Baz - of the 5 entries used for the calculation, your best score is 4.0 for an 18:38 parkrun, which would have scored 3.7 on the day it was run and shortly afterwards, but the factor which the RBR site uses for keeping scores current has decayed from -1.5 which is the max (i.e. entry is very current) down to -1.2. Your best ever score (excluding the time proximity factor) was last year's 91:55 at Livingstone HM scoring a 3.8 (which would have been worth 2.3 with the -1.5 time bonus).
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Oct 2019
10:10am, 1 Oct 2019
32,534 posts
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HappyG(rrr)
That's because Bazo does parkrun at Cramond in Edinburgh which is one of the fastest, flattest courses in the country (though the wind can be a b*gger). I got a better RBR score for high 20 mins at local lochside, trail parkrun vs. low 20s at Cramond. Which is why I like it!  G
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Oct 2019
10:11am, 1 Oct 2019
8,846 posts
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larkim
Yep, that's certainly true.
I quite like the idea of RBR, and I sort of get how it works, though I'd like a lot more insight into recalculating the SSS element of it just to have a play.
Son dipped into negative over the weekend and his first question was "what does that mean"? when I showed it to him. I just said "it's a nice thing to have"!
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Oct 2019
10:12am, 1 Oct 2019
2,302 posts
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J2R
One thing I've seen happen a couple of times is that I get a handicap boost from a parkrun when there is a big local race next day which I am not doing. I run the parkrun hard and some of the guys who would normally be ahead of me are not, because they're taking it easy because of the Sunday race. I do well relative to them, ergo a boost. It's one of the reasons I take the whole thing with a pinch of salt, to be honest.
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Oct 2019
10:22am, 1 Oct 2019
32,535 posts
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HappyG(rrr)
Wow, a negative RBR? The answer is "you are elite", isn't it? Like scratch in golf means you are up there with the pros? Or 100% WAVA ranking means you are the current world record holder! G
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Oct 2019
10:28am, 1 Oct 2019
8,848 posts
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larkim
Not quite elite I don't think - from what I've read, Tim Grose who came up with the concept had the idea of a "scratch" athlete and put some parameters around that. So whilst playing off scratch doesn't make you an elite, it does mean you are objectively "good".
His profile to achieve negative was a good run of current parkruns:-
16:57
17:04
17:17
17:24
Plus 10m in 58:59.
Most of those score 3.x as basic scores, but the SSS and TP factors bring those down significantly. I think I seem to remember reading that a 5k at about 15:30 is a pure "scratch" score.
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Oct 2019
11:12am, 1 Oct 2019
15,307 posts
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Bazoaxe
That Livingston half was run on ice and was dangerous beyond belief. I also make a route error and but a few hundred meters off the corse but was just happy to finish in one piece
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Oct 2019
11:22am, 1 Oct 2019
8,854 posts
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larkim
Sounds like the high score was well deserved then Baz!
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Oct 2019
6:45pm, 2 Oct 2019
15,318 posts
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Bazoaxe
larks, how do you get to the score for each run ?
My 1:22 HM is on now and I have gone to 4.1 which equals my best ever ranking. Looks like I need a big parkrun PB to get to 4.0
Interestingly I think it rates my 83:29 at alloa as a better run than my 82:57 PB
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Oct 2019
7:07pm, 2 Oct 2019
5,353 posts
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jda
You have to add &debug=y on the URL to get to the full details. I blogged about it earlier this year. The algorithm is a bit opaque and the numbers displayed don't tell the whole story.
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