Our pal
dummyrun wrote the Playoff Preview for ASA:
https://www.americansocceranalysis.com/home/2018/10/30/postseason-preview-nycfc
It's long. It's dense. It has a lot of charts. I mean, even by his standards, it is chart heavy. You will learn a lot. Go read it. Maybe twice. There is a lot of good stuff there.
But I have one big problem. Really big. The first chart in the article is a Vieira/Torrent comparison, over lots of regular and advanced stats, and it shows that the team is better under Torrent on basically all the advanced stats while behind on the regular ones. This is known as bad luck.
But. This is a big but. And I'm disappointed Dummy didn't notice this, or actively chose to ignore it. I focus on the xG stats because those are the main ones and all I have patience to dig through. And as Dummy lays out, xGF went up from 1.57 to 1.73 when Dome took over, and xGA went down from 1.32 to 1.17. So the team got better, right? Here's a simpler chart with just those stats (some of my numbers are just slightly different because of different rounding algorithms I think):
View attachment 9290
Yay better. All good. But let's compare these 2 coaches:
View attachment 9291
Coach 1 has results better than Torrent. Coach 2 is worse that Vieira. And -- big reveal -- they are both Dome Torrent, split between his his first 9 games (through the Toronto Away game) and his last 10 when the team fell apart. According to Expected Goals, the longer Torrent was in charge, the worse NYCFC played. The results were not bad luck. They matched the run of play. The only reason Dome's results look better than Vieira's is that before he changed things up so much, and brought in his guys, the team killed it, having it's best run of the season. So the ASA article basically masks the correlation between advanced stats and results by treating Dome's 19 games as a consistent run of play, which they were not. There was no bad luck that I see. The team had good results for Dome when xG says they played well, and poor results when they did not.
The Home and Away splits show that the big difference was Away, though the team got worse at Home also.
First, Home. "Dome" is his record as a whole. "Dome1" represents his first 5 Home games, "Dome2" his last 5:
View attachment 9292
It is pretty consistent, but though the differences are small, the team actually performed better under Vieira, and then the Expected Goals Against really jumped in the final quarter of the season under Dome. Home defense got worse, according to xG.
Now Away. NYCFC played 9 games Away under Dome. The Dome1/2 split is First 4, last 5.
View attachment 9293
Holy crap on a stick. At first, the team improved
a lot on the road, and you may remember they won 2 Away games after a long dry spell. But suddenly Expected Goals For went down an entire goal per game. That's massive. Expected Goals Against went up by 0.6 for a swing in the wrong direction of 1.59 in Expected Goal Differential between the first half of Torrent's tenure and the second half playing Away.
What excuses are there for this? Schedule? Injuries? I cannot go with injuries because the first half of Torrent's time coincides almost perfectly with Villa's long absence, while the crap run overlaps with a missing Medina. That doesn't really explain anything.
Finally, I understand that 5 and 4 game samples are really small. Maybe Dome had an anomalously great short run, then a similar bad run. Maybe next year averages out all good. But the thesis that Dome simply improved the team and the poor results do not coincide with how he had the team playing does not hold up when you break it down. Dome got the results he deserved. He won when the team played well, and lost when they did not. That's true whether you go by the eye test or xG, and bad luck doesn't really play into it. Maybe the team deserved to win a little more over the last 10, as the xGD was barely on the positive side overall. But xG says they certainly did not deserve a strong record, and any analysis of Torrent has to consider why the team did so much worse the longer he was in charge.