GT Hoops General Topics

Peacone36

Helluva Engineer
Messages
12,629
Location
Maine
You’all think I was making a joke? Very serious stuff this Pope’s connections > Villanova basketball. Just ask the Celtics how they lost 2 straight at home when they were up by 20 in each & hadn’t lost to the Knicks (4-0) during the regular season. You think it coincidental the Knicks roster has 3 Villanova guys on it, all from their Championship team? Ha!!!


View attachment 18331
Their severe layup allergy is most of the problem. When you’re up 20 just take the *** **** ************* layups. ***** ******* ******
 

spdrama

Guest
Their severe layup allergy is most of the problem. When you’re up 20 just take the *** **** ************* layups. ***** ******* ******
1746800703260.jpeg
 

GTpdm

Helluva Engineer
Messages
2,101
Location
Atlanta GA
I’ll admit I had a few drinks today doing yard work and thought this was someone we were looking at in the portal or an overseas addition until I realized who it was.. Lol.
I hope you weren't operating any machinery, like a chainsaw...wouldn't want you having to change your handle to "Lefty" or some such. ;)
 

stinger78

Helluva Engineer
Messages
10,597
So the bias was because they won a bunch of games? I need some help understanding this line of reasoning.
It creates a positive feedback loop in the SOS metric. It’s not human bias (necessarily), is algorithmic error which results in bias. When an algorithmic output then becomes input for the next run the risk of a positive feedback loop is created. The SEC had a very good week vs. the ACC early on and earned a lot of higher rankings and strength ratings (though a lot of those ACC teams turned out to be crappy teams). Then as they played each other, the strength outputs were used as inputs and so they got stronger and stronger and stronger SOS ratings, which moved them from 5/6 to 9 teams in the top 25 SOS by end of Feb, just playing with themselves. This SOS metric was a factor in the multiplicity of higher ranked teams and selections. It evened out again somewhat after the NCAAT, back down to 7.
 

GTpdm

Helluva Engineer
Messages
2,101
Location
Atlanta GA
It creates a positive feedback loop in the SOS metric. It’s not human bias (necessarily), is algorithmic error which results in bias. When an algorithmic output then becomes input for the next run the risk of a positive feedback loop is created. The SEC had a very good week vs. the ACC early on and earned a lot of higher rankings and strength ratings (though a lot of those ACC teams turned out to be crappy teams). Then as they played each other, the strength outputs were used as inputs and so they got stronger and stronger and stronger SOS ratings, which moved them from 5/6 to 9 teams in the top 25 SOS by end of Feb, just playing with themselves. This SOS metric was a factor in the multiplicity of higher ranked teams and selections. It evened out again somewhat after the NCAAT, back down to 7.
Don't they know they'll go blind if they keep doing that?
 

TechPhi97

Helluva Engineer
Messages
2,029
Location
Davidson, NC
It creates a positive feedback loop in the SOS metric. It’s not human bias (necessarily), is algorithmic error which results in bias. When an algorithmic output then becomes input for the next run the risk of a positive feedback loop is created. The SEC had a very good week vs. the ACC early on and earned a lot of higher rankings and strength ratings (though a lot of those ACC teams turned out to be crappy teams). Then as they played each other, the strength outputs were used as inputs and so they got stronger and stronger and stronger SOS ratings, which moved them from 5/6 to 9 teams in the top 25 SOS by end of Feb, just playing with themselves. This SOS metric was a factor in the multiplicity of higher ranked teams and selections. It evened out again somewhat after the NCAAT, back down to 7.
Perhaps I don’t understand how those ranking frameworks work. Is SOS not based on performance?
 

slugboy

Moderator
Staff member
Messages
13,979
Perhaps I don’t understand how those ranking frameworks work. Is SOS not based on performance?
Some ratings estimate strength of schedule based on last year. As the season goes on, they reevaluate based on wins and losses. The early season estimates are arguably weeded out by the halfway point of the season.

Because the first half of NCAA basketball is out of conference games, you’re seeing an argument that the ACC started cold, and didn’t get a chance to improve their perception because by the time they were playing well, there were only conference games left.

There’s some argument that the schedule doesn’t really help find out who the most worthy teams are at the end of the season. But it’s still mostly true that the ACC didn’t have a good year. That is, the ACC got a weaker reputation than deserved, but even so they were still weaker than the other top conferences in 2024

Edit: you might have been wry in your post; if your were, it helps to put “/s” at the end of your post, or some indicator
 

stinger78

Helluva Engineer
Messages
10,597
Some ratings estimate strength of schedule based on last year. As the season goes on, they reevaluate based on wins and losses. The early season estimates are arguably weeded out by the halfway point of the season.

Because the first half of NCAA basketball is out of conference games, you’re seeing an argument that the ACC started cold, and didn’t get a chance to improve their perception because by the time they were playing well, there were only conference games left.

There’s some argument that the schedule doesn’t really help find out who the most worthy teams are at the end of the season. But it’s still mostly true that the ACC didn’t have a good year. That is, the ACC got a weaker reputation than deserved, but even so they were still weaker than the other top conferences in 2024

Edit: you might have been wry in your post; if your were, it helps to put “/s” at the end of your post, or some indicator
I think the risk is the early bump (not entirely undeserved, but certainly not understood) from their early OOC wins - particularly against a subpar ACC with many rebuilding teams. You can’t know all that up front, thus the bump. That’s OK but it must be addressed and corrected.

Look at the RPI from last season at 2-weeks periods. You’ll see it. There were 4/5 SEC teams in the SOS top 25 initially. That’s about right. It stayed 5/6 past NYD. Again, based on OOC results, not bad. But then by the end of Feb there were 9 SEC teams in top 25 SOS. How did that happen? They played only themselves and the feedback loop took over, IMO.

Anytime your output from one iteration of an algorithm is then fed back into it as input for the next iteration you risk this. A moderating feature should be added that senses and responds to dampen the feedback. It’s basic complex system dynamics: probe, sense, respond. You never know when a feedback loop might arise, so you have to probe for them and respond accordingly.

As it were, the NCAAT provided that moderating input. However, the bloated SOS numbers had already justified 14 of 16 SEC teams getting slots, several with horrible conf records. The only way to justify that, again IMO, was the hyped SOS ratings that weren’t corrected.

Not saying it was surely human bias (though there likely was), but it was the data error that was (apparently) not corrected prior to its use by the committee.
 

cpf2001

Helluva Engineer
Messages
2,768
Yeah IMO the issue is that instead of the piles of conference losses convincing the model (and then the selection committee) that the teams at the bottom of the SEC’s OOC wins were probably fluky, they had nothing but “good losses” and so didn’t get penalized enough for those losses.

The conference records showed the separation between the top 3 or 4 SEC teams and the rest. They also showed the separation between 5-8 and the rest. And 9-12 vs 13-14.

The ACC did nothing to distinguish itself regardless, but it’s particularly hard to justify teams 13/14 in the SEC as having a good resume. If they’d been worthy, they would’ve won a few more games and clogged up the middle of the standings further, if not brought some of the top teams closer even.
 

Root4GT

Helluva Engineer
Messages
6,025
It creates a positive feedback loop in the SOS metric. It’s not human bias (necessarily), is algorithmic error which results in bias. When an algorithmic output then becomes input for the next run the risk of a positive feedback loop is created. The SEC had a very good week vs. the ACC early on and earned a lot of higher rankings and strength ratings (though a lot of those ACC teams turned out to be crappy teams). Then as they played each other, the strength outputs were used as inputs and so they got stronger and stronger and stronger SOS ratings, which moved them from 5/6 to 9 teams in the top 25 SOS by end of Feb, just playing with themselves. This SOS metric was a factor in the multiplicity of higher ranked teams and selections. It evened out again somewhat after the NCAAT, back down to 7.
The SEC went 59-19 against the other Power Conferences last season in OOC games. That is what drove their very high NET rankings and caused the feedback loop. They earned the NET rankings based on the games played in Nov-Dec.

Here are the Power Conference records against Top 25 teams thru December 2024:
SEC: 15-10
ACC: 5-31
Big East: 5-18
Big Ten: 11-26
Big 12: 9-22
 

cpf2001

Helluva Engineer
Messages
2,768
The SEC went 59-19 against the other Power Conferences last season in OOC games. That is what drove their very high NET rankings and caused the feedback loop. They earned the NET rankings based on the games played in Nov-Dec.

Here are the Power Conference records against Top 25 teams thru December 2024:
SEC: 15-10
ACC: 5-31
Big East: 5-18
Big Ten: 11-26
Big 12: 9-22
Aggregates hide details.

Texas OOC, for instance, against better OOC teams:

Loss to Xavier in the tourney
Loss to tOSU
Loss to UConn

Beat St Joes (NIT team), looks like their most decent OOC win? They did also beat two bad ACC teams.

But Texas didn’t themselves do the work that earned the SEC that favor.

So do a couple upsets in conference, with a 6-12 record and a TON of “good” losses, really justify a bid?

The model says “they didn’t embarrass themselves, their losses were good!” But at some point loss quantity needs to matter
 
Top