Calculating Z score for batting average - Fantasy Baseball Cafe 2014 Fantasy Baseball Cafe
100% Deposit Bonus for Cafe Members!

Return to Baseball Leftovers

Calculating Z score for batting average

Moderator: Baseball Moderators

Re: Calculating Z score for batting average

Postby Mike_nyc » Fri Feb 20, 2009 5:25 pm

Thinking about it further, I'm guessing I should use my entire player universe, since K totals, for example, would favor SP's and bring down a good RP's strikeout value.

Is this correct?
Mike_nyc
College Coach
College Coach


Posts: 328
Joined: 21 Mar 2006
Home Cafe: Baseball

Re: Calculating Z score for batting average

Postby RugbyD » Fri Feb 20, 2009 9:01 pm

Mike_nyc wrote:Thinking about it further, I'm guessing I should use my entire player universe, since K totals, for example, would favor SP's and bring down a good RP's strikeout value.

Is this correct?

I would limit it to what players you think are reasonably draftable, otherwise you start comparing to guys who will only get 350 ABs and that will skew your playables too high.
TennCare rocks!!!!
RugbyD
Hall of Fame Hero
Hall of Fame Hero

User avatar
Cafe Ranker
Posts: 5591
(Past Year: 4)
Joined: 7 Dec 2004
Home Cafe: Baseball
Location: punting small dogs and being surly

Re: Calculating Z score for batting average

Postby Mays » Fri Feb 20, 2009 9:15 pm

TheRock wrote:In the end, this actually takes ABs back out the equation. xH tells us how much a players performance increases the overall team numerator when computing team BA, but not how much it increases the denominator. And you need both to know the value.

I.e. ARod has 13 hits over average. My team altogether has 60 hits over average. Some other team also has 60 hits over average. The winner is whichever team attained that in the fewest at bats. It's information you need to know.

But as a rough guide of value, it does have its purpose.

Yep, this all assumes that each team manages to compile about an equal number of AB. If there is a big variation between teams, it won't work as well.
Mays
Little League Legend
Little League Legend


Posts: 17
Joined: 19 Feb 2009
Home Cafe: Baseball

Re: Calculating Z score for batting average

Postby Mays » Fri Feb 20, 2009 9:19 pm

Mike_nyc wrote:this has been great info thanks alot. after calculating all the xH's, he calculates the SD of these values as part of his formula, correct?

Correct. Once you calculate xH, you have a counting stat that works just like SB or HR. So you calculate the z-score just like you would for those categories:

AVG value = player_xH / stdev(xH)
SB value = player_SB / stdev(SB)
etc.
Mays
Little League Legend
Little League Legend


Posts: 17
Joined: 19 Feb 2009
Home Cafe: Baseball

Previous

Return to Baseball Leftovers

Who is online

Users browsing this forum: germani40, louelladg18, NZ Eff and 8 guests

Forums Articles & Tips Sleepers Rankings Leagues


Today's Games
Saturday, Apr. 19
(All times are EST, weather icons show forecast for game time)

Chi Cubs at Chi Cubs
(1:05 pm)
Minnesota at Kansas City
(1:05 pm)
Cincinnati at Cincinnati
(1:08 pm)
Houston at Oakland
(1:35 pm)
Milwaukee at Pittsburgh
(2:10 pm)
NY Yankees at Tampa Bay
(2:20 pm)
indoors
Seattle at Miami
(4:05 pm)
indoors
NY Mets at NY Mets
(7:05 pm)
Atlanta at Atlanta
(7:10 pm)
Philadelphia at Colorado
(7:10 pm)
Chi White Sox at Texas
(7:10 pm)
LA Dodgers at LA Dodgers
(8:05 pm)
Arizona at Arizona
(8:10 pm)
San Diego at San Diego
(8:10 pm)
San Francisco at San Francisco
(8:40 pm)

  • Fantasy Baseball
  • Article Submissions
  • Privacy Statement
  • Site Survey 
  • Contact