Hey Rowsus,
Long term reader, first time poster. I always like your articles from a stats point of view. (I'm involved at Community Football in the Coaching/Stats field).
I was wondering if you knew of or where I could locate some of the formulas to calculate:
BE;
Proj $ rise
Proj $ fall
How to work out how much a player is priced at, average wise. (Ie. "Neale is priced at 130")
I've really enjoyed your posts on "expectations" and this has helped me not to get sucked in by the "flash in the pan" players.
Thanks mate,
Nath
Hi Nath,
I'll have a go and I'm sure Rowsus will correct any shortcomings.
The formula for the prices in a normal season is NP = 0.75*OP + 0.25*(3 RD AVG)*MN
Where:
OP = Old Price (price going into the round you're looking at)
NP =New Price (price at the end of the round you're looking at
MN = Magic Number
MN is a number which varies between around $5,400/pt at the start of the year (Neale with an average of 134.4 is priced at $721,800, which would give you a starting MN of around $5,370/pt) and ends up around 4,900-ish.
It all depends on the year, the main thing is that it drops in season, the biggest drops coming in the early rds as the rookie prices rise (and the prices of the remaining players in the pool have to reduce to o***et and keep a constant Total Price Pool (TPP)
Looks like they are estimating a Magic Number around the $5,120/pt mark for next week, for example.
BE: The score at which the player's OP = NP
Using the formula above:
NP = OP = 0.75*OP + 0.25*(3 RD AVG)*MN
0.25*OP = 0.25*(3 RD AVG)*MN (cancel out the 0.25 on both sides)
OP = (3 RD AVG)*MN
OP/MN = 3 RD AVG
And the 3 RD AVG = (score of round n-2 + score of round n-1 + BE score of current round n)/3
OP/MN = (score of round n-2 + score of round n-1 + BE score of current round n)/3 (rearranging to isolate BE score of current rd)
3*OP/MN - (score of round n-2 + score of round n-1) = BE score of current round n
Using an example: Lachie Neale
OP = $721,800
MN = $5,120 (currently, roughly)
Score round n-2 =77
Score round n-1 = 75
3*721,800/5,120 - (77+75) = BE score of current rd 3 = 271
BE score of current rd = 271, which is what the SuperCoach site shows.
To figure out the expected MN in any one week, take a couple of players' BEs and work back the other way:
MN = (3*OP) / (score of round n-2 + score of round n-1 + BE score of current round n)
In terms of projected rise and fall, it's always about the difference between what you think they'll score and the BE.
If you think they'll go 30 higher than the BE of that week, for example:
NP(+30) = 0.75*OP + 0.25*(3 RD AVG B)*MN, where the 3 RD AVG B includes the +30 vs the BE and bumps the AVG up 10 pts.
NP(+30) - NP(BE) = 0.25 * MN * (Expected Score - BE score)/3 = 0.25 * MN * (30)/3
If you assume an MN of around $5,100/pt to make things simple, then you get (0.25 * 5,100/3) * (Expected Score - BE Score)
And (0.25*5,100/3) ends up at around $425/pt.
As a rough rule of thumb, take the differential between your expectation of their score minus the BE and multiply that by $425/pt to get a rough estimate of their increase / decrease. (You can make it more exact by calculating the actual current MN, but for a simple rule of thumb, the 425 will give you a good enough idea unless it's a really tight one. You can use 415 after about rd 6.
Lachie Neale:
BE: 271
Your expectation: Let's say 110
Expected Price Drop assuming $5,100/pt would be (110-271)pts * $425/pt = $-68,425 price change
(Expected Price Drop using the more accurate current MN would be (110-271)/3 * 0.25 * 5,120 = -68,694 price change)
Hope that helps and if I've buggered anything up, those smarter than me will correct it for you. Good luck