1. #1
    asdvender
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    Simple Backtesting

    Hey all,

    I had some time on my hands and went back the last 3 years in the NBA (also did playoffs only backtesting) to see what the results were regarding covering of spreads and over/unders.

    *Blindly of course, not considering injuries, suspensions, etc.

    I thought I would share the results and see if someone wanted to or already had the numbers...

    I am actually still finishing up the analysis, but I thought I would post this to see if anyone could begin the process to calculate their results or start by the time I post later tonight.

    Thanks!

  2. #2
    asdvender
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    I know this was probably the dumbest idea, but hell...I was bored. So anyhow here are my results...

    Percentages represents the percentage that category covered the spread.

    --------------------
    04-05 Season...

    HOME: 48%
    AWAY: 49%
    PUSH: 3%

    FAVORITE: 49%
    UNDERDOG: 48%
    PUSH: 3%

    HOME/FAVORITE: 48%
    AWAY/UNDERDOG: 48%
    PUSH: 4%

    HOME/UNDERDOG: 44%
    AWAY/FAVORITE: 46%
    PUSH: 10%

    OVER: 50%
    UNDER: 49%
    PUSH: 1%

    --------------------
    05-06 Season...

    HOME: 48%
    AWAY: 50%
    PUSH: 2%

    FAVORITE: 48%
    UNDERDOG: 50%
    PUSH: 2%

    HOME/FAVORITE: 47%
    AWAY/UNDERDOG: 50%
    PUSH: 3%

    HOME/UNDERDOG: 45%
    AWAY/FAVORITE: 47%
    PUSH: 8%

    OVER: 50%
    UNDER: 49%
    PUSH: 1%

    --------------------
    06-07 Season...

    HOME: 46%
    AWAY: 51%
    PUSH: 2%

    FAVORITE: 47%
    UNDERDOG: 51%
    PUSH: 2%

    HOME/FAVORITE: 45%
    AWAY/UNDERDOG: 51%
    PUSH: 3%

    HOME/UNDERDOG: 45%
    AWAY/FAVORITE: 47%
    PUSH: 8%

    OVER: 51%
    UNDER: 49%
    PUSH: 1%

    --------------------
    07-08 Season...

    HOME: 49%
    AWAY: 49%
    PUSH: 1%

    FAVORITE: 51%
    UNDERDOG: 47%
    PUSH: 1%

    HOME/FAVORITE: 50%
    AWAY/UNDERDOG: 48%
    PUSH: 2%

    HOME/UNDERDOG: 45%
    AWAY/FAVORITE: 50%
    PUSH: 4%

    OVER: 49%
    UNDER: 50%
    PUSH: 1%

    --------------------
    --------------------
    --------------------

    04-08 Seasons...

    HOME: 48%
    AWAY: 49%
    PUSH: 3%

    FAVORITE: 49%
    UNDERDOG: 49%
    PUSH: 3%

    HOME/FAVORITE: 48%
    AWAY/UNDERDOG: 49%
    PUSH: 4%

    HOME/UNDERDOG: 44%
    AWAY/FAVORITE: 47%
    PUSH: 9%

    OVER: 50%
    UNDER: 49%
    PUSH: 1%

    --------------------
    --------------------
    --------------------

    So...in the end, not surprising, there is no relationship to home/away or underdog/favorite in the covering of spreads or over/under...damn! Was hoping for a 55% somewhere!

  3. #3
    Arnold
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    So...in the end, not surprising, there is no relationship to home/away or underdog/favorite in the covering of spreads or over/under...damn! Was hoping for a 55% somewhere!
    If only it was that easy. Lol.

  4. #4
    asdvender
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    Here are the my NBA Playoff results...

    --------------------
    2005-2007 Playoffs...

    HOME: 50%
    AWAY: 46%
    PUSH: 4%

    FAVORITE: 50%
    UNDERDOG: 47%
    PUSH: 4%

    HOME/FAVORITE: 50%
    AWAY/UNDERDOG: 46%
    PUSH: 4%

    HOME/UNDERDOG: 43%
    AWAY/FAVORITE: 42%
    PUSH: 15%

    OVER: 49%
    UNDER: 49%
    PUSH: 1%

    --------------------
    2005-2007 Playoffs...EASTERN CONFERENCE

    HOME: 47%
    AWAY: 48%
    PUSH: 5%

    FAVORITE: 46%
    UNDERDOG: 49%
    PUSH: 5%

    HOME/FAVORITE: 45%
    AWAY/UNDERDOG: 48%
    PUSH: 7%

    HOME/UNDERDOG: 42%
    AWAY/FAVORITE: 39%
    PUSH: 18%

    OVER: 47%
    UNDER: 50%
    PUSH: 3%

    --------------------
    2005-2007 Playoffs...WESTERN CONFERENCE

    HOME: 51%
    AWAY: 46%
    PUSH: 3%

    FAVORITE: 52%
    UNDERDOG: 45%
    PUSH: 3%

    HOME/FAVORITE: 52%
    AWAY/UNDERDOG: 45%
    PUSH: 3%

    HOME/UNDERDOG: 42%
    AWAY/FAVORITE: 46%
    PUSH: 13%

    OVER: 51%
    UNDER: 48%
    PUSH: 1%

    --------------------
    2005-2007 Playoffs...1ST ROUNDS

    HOME: 48%
    AWAY: 47%
    PUSH: 5%

    FAVORITE: 52%
    UNDERDOG: 43%
    PUSH: 5%

    HOME/FAVORITE: 50%
    AWAY/UNDERDOG: 43%
    PUSH: 7%

    HOME/UNDERDOG: 34%
    AWAY/FAVORITE: 47%
    PUSH: 18%

    OVER: 49%
    UNDER: 48%
    PUSH: 3%

    --------------------
    --------------------
    --------------------

    Once again, nothing of a trend...also only sampled the last three NBA Playoffs...just thought I'd post, because I had always wondered!

  5. #5
    Arnold
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    Dude, seriously, you're wasting your time.

  6. #6
    LT Profits
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    Since 1990-91 Playoffs: Post-Season teams going UNDER after 3+ OVERS: 143-111-7, 56.3%.

  7. #7
    rake922
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    Quote Originally Posted by asdvender View Post
    Here are the my NBA Playoff results...

    --------------------
    2005-2007 Playoffs...

    HOME: 50%
    AWAY: 46%
    PUSH: 4%

    FAVORITE: 50%
    UNDERDOG: 47%
    PUSH: 4%

    HOME/FAVORITE: 50%
    AWAY/UNDERDOG: 46%
    PUSH: 4%

    HOME/UNDERDOG: 43%
    AWAY/FAVORITE: 42%
    PUSH: 15%

    OVER: 49%
    UNDER: 49%
    PUSH: 1%

    --------------------
    2005-2007 Playoffs...EASTERN CONFERENCE

    HOME: 47%
    AWAY: 48%
    PUSH: 5%

    FAVORITE: 46%
    UNDERDOG: 49%
    PUSH: 5%

    HOME/FAVORITE: 45%
    AWAY/UNDERDOG: 48%
    PUSH: 7%

    HOME/UNDERDOG: 42%
    AWAY/FAVORITE: 39%
    PUSH: 18%

    OVER: 47%
    UNDER: 50%
    PUSH: 3%

    --------------------
    2005-2007 Playoffs...WESTERN CONFERENCE

    HOME: 51%
    AWAY: 46%
    PUSH: 3%

    FAVORITE: 52%
    UNDERDOG: 45%
    PUSH: 3%

    HOME/FAVORITE: 52%
    AWAY/UNDERDOG: 45%
    PUSH: 3%

    HOME/UNDERDOG: 42%
    AWAY/FAVORITE: 46%
    PUSH: 13%

    OVER: 51%
    UNDER: 48%
    PUSH: 1%

    --------------------
    2005-2007 Playoffs...1ST ROUNDS

    HOME: 48%
    AWAY: 47%
    PUSH: 5%

    FAVORITE: 52%
    UNDERDOG: 43%
    PUSH: 5%

    HOME/FAVORITE: 50%
    AWAY/UNDERDOG: 43%
    PUSH: 7%

    HOME/UNDERDOG: 34%
    AWAY/FAVORITE: 47%
    PUSH: 18%

    OVER: 49%
    UNDER: 48%
    PUSH: 3%

    --------------------
    --------------------
    --------------------

    Once again, nothing of a trend...also only sampled the last three NBA Playoffs...just thought I'd post, because I had always wondered!
    18% of the time there was a push? thats way too high

  8. #8
    asdvender
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    Yea, I thought 10% of the time was too high, then I saw the 18% later and kinda just shut up...

    By the way, it wasn't so much a waste of time, because after I had the formulas set in Excel, I just dropped in the data and it spit the results out to me...

    7 games of the 38 that were possible for that category (38) pushed...that came to 18%, but it seems reasonable. I guess oddsmakers turn up their game and hit their spreads at a higher rate in playoffs?!
    Last edited by asdvender; 04-18-08 at 10:49 PM.

  9. #9
    asdvender
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    Quote Originally Posted by LT Profits View Post
    Since 1990-91 Playoffs: Post-Season teams going UNDER after 3+ OVERS: 143-111-7, 56.3%.
    I know I'm probably wasting my time...but I looked into LT's comment and although I don't have the data from 1990-1991 playoffs, I did look at the last three years, since I already had the data...

    --------------------
    O/O/U: 18/44 (41%)
    U/U/O: 14/39 (36%)
    Bucking the trend: 32/83 (39%)

    O/O/O/U: 7/15 (47%)
    U/U/U/O: 6/17 (35%)
    Bucking the trend: 13/32 (41%)
    --------------------

    I know it's only three years of data, but it does hint that betting against the trend could be costly.

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