Help on RPI vs BPI Strength of Schedule

#1
Orangedogsrule

Orangedogsrule

PULEEZE LET SMOKEY WIN!!!
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#1
MODS: Please don't merge this for a while.

You'd think SOS would be standardized across all the rating/ranking systems but evidently it's not.

Can anyone provide links or quotes or best of all a book title that disects them all and particularly as to the actual formula for calculating STRENGTH OF SCHEDULE (right now I'm only looking for SOS) each system uses? I'm certainly not a statistician, and I'm sure more than just me are bumfuzzled. When trying to win a billion dollars, (yeah sure $1,000,000,000.00 ... mine all mine) all these SagarinESPNKenPomCBS thingies run together, and THEY ARE ALL DIFFERENT.

How can ESPN refer to RPI & their own BPI but the SOS in each is so very different. ESPN claims their SOS incorporates opponents, opponents, opponents. OK. But at what time during the year does that begin to acquire/lose real meaning? Early season, meaningless? ..yes. Midseason, enough games have been played to give SOS some weight. End of season, it seems all teams would approach median as 'everyone's SOS is in everyone's SOS'.

So .. SOS ... Heeeeellp!
 
Last edited:
#2
#2
Orangedogsrule said:
MODS: Please don't merge this for a while.

You'd think SOS would be standardized across all the rating/ranking systems but evidently it's not.

Can anyone provide links or quotes or best of all a book title that disects them all and particularly as to the actual formula for calculating STRENGTH OF SCHEDULE (right now I'm only looking for SOS) each system uses? I'm certainly not a statistician, and I'm sure more than just me are bumfuzzled. When trying to win a billion dollars, (yeah sure $1,000,000,000.00 ... mine all mine) all these SagarinESPNKenPomCBS thingies run together, and THEY ARE ALL DIFFERENT.

How can ESPN refer to RPI & their own BPI but the SOS in each is so very different. ESPN claims their SOS incorporates opponents, opponents, opponents. OK. But at what time during the year does that begin to acquire/lose real meaning? Early season, meaningless? ..yes. Midseason, enough games have been played to give SOS some weight. End of season, it seems all teams would approach median as 'everyone's SOS is in everyone's SOS'.

So .. SOS ... Heeeeellp!
Click to expand...

Each rankings system will have different SOS ratings, because their SOS ratings are based on those overall rankings. So, if you play someone ranked #50 in one system and #65 in another system, the impact on your SOS from that game will be greater in the system that had them ranked #50.
 
#3
#3
Honestly I think they use the alphabet soup system. Dip their spoon and see what comes out. I think its all nonsense and they start out the season with ranking based off of the previous season. No rankings should be available until mid December or January 1st.
 
#4
#4
ukvols said:
Each rankings system will have different SOS ratings, because their SOS ratings are based on those overall rankings. So, if you play someone ranked #50 in one system and #65 in another system, the impact on your SOS from that game will be greater in the system that had them ranked #50.
Click to expand...

This may be somewhat true but not completely. RPI strength of schedule does not look at other teams RPI ranking. It looks at other teams true winning percentage.

So as an example having played a team that is 25-5 with a RPI in the 60's (a non-major) is probably better for your sos than say a 19-11 team with an RPI in the low 40's (in this case, UT).

Where I believe SOS numbers differ is that some systems value road and neutral court wins more than a home win. Whereas some systems (RPI) do not differentiate based on WHERE the game was played as it pertains to strength of schedule.
 
#5
#5
Orangedogsrule said:
MODS: Please don't merge this for a while.

You'd think SOS would be standardized across all the rating/ranking systems but evidently it's not.

Can anyone provide links or quotes or best of all a book title that disects them all and particularly as to the actual formula for calculating STRENGTH OF SCHEDULE (right now I'm only looking for SOS) each system uses? I'm certainly not a statistician, and I'm sure more than just me are bumfuzzled. When trying to win a billion dollars, (yeah sure $1,000,000,000.00 ... mine all mine) all these SagarinESPNKenPomCBS thingies run together, and THEY ARE ALL DIFFERENT.

How can ESPN refer to RPI & their own BPI but the SOS in each is so very different. ESPN claims their SOS incorporates opponents, opponents, opponents. OK. But at what time during the year does that begin to acquire/lose real meaning? Early season, meaningless? ..yes. Midseason, enough games have been played to give SOS some weight. End of season, it seems all teams would approach median as 'everyone's SOS is in everyone's SOS'.

So .. SOS ... Heeeeellp!
Click to expand...

That sh!t's way over my head ! :blink:
 
#7
#7
zansdad said:
This may be somewhat true but not completely. RPI strength of schedule does not look at other teams RPI ranking. It looks at other teams true winning percentage.

So as an example having played a team that is 25-5 with a RPI in the 60's (a non-major) is probably better for your sos than say a 19-11 team with an RPI in the low 40's (in this case, UT).

Where I believe SOS numbers differ is that some systems value road and neutral court wins more than a home win. Whereas some systems (RPI) do not differentiate based on WHERE the game was played as it pertains to strength of schedule.
Click to expand...

My rankings system does not calculate SOS based on where everyone is ranked in my system. I came up with SOS by carving out the portion of a team's rating that's attributed to who they played and where. So, I just kinda took for granted that other systems would do the same thing; that is, base SOS on their own numbers somehow.
 
#8
#8
ukvols said:
Each rankings system will have different SOS ratings, because their SOS ratings are based on those overall rankings. So, if you play someone ranked #50 in one system and #65 in another system, the impact on your SOS from that game will be greater in the system that had them ranked #50.
Click to expand...

This hits it. It depends on the particular service's ranking system of all teams. I have seen our SOS currently ranked 17, 23, & 41.
 
#10
#10
ukvols said:
My rankings system does not calculate SOS based on where everyone is ranked in my system. I came up with SOS by carving out the portion of a team's rating that's attributed to who they played and where. So, I just kinda took for granted that other systems would do the same thing; that is, base SOS on their own numbers somehow.
Click to expand...

Some might. Not sure exactly what you carve out or what your system is but I know RPI SOS is a simple 66.7% averaged opponents winning percentage + 33.4% averaged oppononets opponents winning percentage.
 
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