Mayer recently asked me a good question  about some of the more unusual statistics that are carried on our weekly  HARL player and team stats reports such as OPS, RBR, PSP, BAA, XERA, etc.  
I thought this would serve as a nice little blog post for everyone to  enjoy. 
None of these oddball stat  categories count as Scoring Categories  in our league. They're just included on the stat reports for analysis'  sake. They're something else to look at and chew on when you evaluate  players and HARL teams. 
Here's what they mean:
OPS = On-Base Plus Slugging  
    The formula simply adds a  player's/team's On-Base Average to its Slugging  Percentage 
    to get an overall  value. It's a nice overall indicator of  hitting quality since it combines ability 
    to get on base with ability to  hit for power/extra-bases. 
SEC = Secondary Average  
    The formula is (total_bases - hits + bases_on_balls + stolen_bases) /  at_bats  
    A Bill James creation which  basically looks at a batter's ability to take extra  bases 
    as a function of At  Bats. A good way to identify players who hit for  power, steal, and walk a lot. 
RBR = Roto Batter Rating  
    This is a rotisserie  baseball Points Rating for batters devised by me. 
    It's a good overall indicator of  a player's value. The formula is fairly  complex: 
    runs_scored +  runs_batted_in + (home_runs * 3) + (stolen_bases * 3) + 
    (((at_bats +  bases_on_balls) / 625) * (on_base_average - .300) * 1000)
PSP = Power/Speed Points  
    This is a simple Points  Rating for batters also devised by me used to identify players 
    with a good mix of  Power/Speed. 
    The formula is ((home_runs + stolen_bases) * 3) + runs_batted_in +  runs_scored  
BAA = Batting Average Against  
    This Ron Shandler formula is an  approximation of how well opposing batters hit a given pitcher  
    (sometimes also called  Opponent's Batting Avge).  
    The formula is hits_allowed / ((innings_pitched * 2.82) + hits_allowed)   
QSR = Quality Start Ratio  
    The proportion of a pitcher's  Quality Starts to all the games he has Started this season. 
    The formula is quality_starts / games_started 
XERA =  Expected ERA 
    This is also a formula used by Bill James and Ron  Shandler. 
    It approximates what a pitcher's  ERA should be based on his base performance indicators.  
    So a pitcher with a lower XERA than his actual ERA has  been pitching in some bad luck. 
    The formula is very complex:  (.575 * hits_allowed / innings_pitched * 9)  
    + (.94 *  homers_allowed / innings_pitched * 9) + (.28 * walks / innings_pitched * 9)  
      - (.01 *  strikeouts / innings_pitched * 9) - 2.77 
RPR = Roto Pitcher  Rating
    This is a rotisserie  baseball Points Rating for pitchers devised by me. 
    It's a good overall indicator of  a pitcher's value. The formula is fairly complex:  
    (strikeouts + (wins * 10) + (saves * 5) +  (innings_pitched / 1.33) + 
    ((4.50 - earned_run_average) * (innings_pitched  / 200) * 100) + 
    ((1.50 - pitching_ratio) * (innings_pitched /  200) * 500)) * 0.5     
So there you have it. These are neat little stats  categories for "looking outside the box" and analyzing players and fantasy teams  using other indicators that aren't as obvious as the basic 12 stats we use for  scoring purposes. 

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