Showing posts with label Biases. Show all posts
Showing posts with label Biases. Show all posts

Tuesday, January 19, 2016

Thoughts on my college bowl pool

For the second year in a row I participated in an against-the-spread contest with some high school friends for the college bowl season. For the second year in a row I didn’t win (15/16 this year, 4/25 last year).

I did, however, get some good anecdotes:

Familiarity

This group of people mainly from Columbus, Ohio and mainly living in the Midwest still has a bit of a Big Ten problem. Last year the group was 15% more confident in games involving Big Ten teams than games not involving them while underperforming against the spread – the ATS win percentage was 47.2% for these games and 48.2% for non-Big Ten games.

This year the group was 17% more confident when a Big Ten team was involved while managing to win 48.8% of them. The win percentage on non-Big Ten games was 53.4%.

Confidence

Last year the group was overconfident in what turned into losses, betting 21.0 points against 19.5 on games they ended up picking correctly. This year was flipped with the wins worth 21.6 while losses were 20.6.

As is evident in the chart below, however, there was no correlation between confidence and success.



Confidence (pt. 2)

The game with the highest confidence was (inexplicably) the Outback Bowl between Northwestern and Tennessee featuring 13 out of 16 people picking the wrong team and an average confidence of 30.4. The least confident game was San Jose State vs. Georgia State with 9 of 16 teams picking correctly at an average confidence of 8.9.

Confidence (pt. 3)

After assigning the national championship game the lowest aggregate wager last year (8.8 out of 39), this year people were feeling a bit more lucky and gave it a higher risk than 8 other bowls (16.4 out of 41) despite not knowing which two teams would be contesting the game.

14 of 16 got the Orange Bowl right while only 2 of 16 got the Cotton Bowl correct (Big Ten) with 11 of the 16 ending up with a viable championship game pick (5 Clemson, 6 Alabama). The Alabama picks were worth 19.8 – above the 14.3 for losers – so maybe those people were on to something.

Tuesday, July 9, 2013

NBA draft picks as assets – the triumph of hope over experience?


Zach Lowe had an article up today on Grantland about the current view around the NBA that draft picks are extremely valuable assets for teams to stockpile and use in future trades. He explains:
The word "asset" has never had more currency in the NBA. Draft picks, even in the 20s, are "assets" teams can use to acquire cheap talent, or to grease the wheels in potential mega-trades for star players. The Celtics view the three unprotected picks they nabbed from the spend-spend-spend Nets not just as young players that will don the hallowed green, but as "assets" carrying the lure of the unknown for a rival GM looking to move a disgruntled star.
Luckily for us, someone has already gone to the trouble of valuing NBA draft picks and the results should be sobering to teams clutching likely mid- to late-first round picks and hoping for the next Tony Parker.

Source: ESPN.com


Even teams holding picks they think will be at the top of the draft should look carefully at the rate of team performance mean reversion in the NBA (see this post from last year) and be realistic about where the pick will be.

I can see two primary reasons for the run-up in value of picks relative to real, actual players - besides the momentum of "everyone is doing it."

  1. The 2011 CBA – The NBA went to a lot of trouble, and cancelled a lot of games, to get a very owner-friendly collective bargaining agreement in their latest negotiations.