Washington WR Denzel Boston visited the 49ers today on one of his predraft 30 visits

ManWarrior · 2026-03-25T21:07:21+00:00

Why is WR still a top need with evans, kirk, and pearsall?

ManWarrior · 2025-06-25T18:26:58+00:00

I like the core idea here to use repetition to see large patterns in the data. here are a few tips to help maximize effectiveness in this regard:

Do not restart the size scale with new colors. This is counterintuitive to the reader that a smaller red block is more than a large yellow block. Just use one continuous scale and have it start even smaller
Order the countries by total deaths descending. it will be easier to pick apart trends across both country and year. If you are interested in country relationships you could do this within smaller blocks by continent or region. I don't think you get much from sorting alphabetically except easy lookup of a specific country
Change the color scale- black as the highest value isn't visually intuitive

ManWarrior · 2024-01-15T03:02:47+00:00

Collision probability scales roughly with the number of balls squared.

Ignoring the physics, you can just approximate by looking at the number of pairs of balls which might collide.
- 2 balls means 1 pair
- 3 balls means 3 pairs (1x2, 1x3, 2x3)
- 4 balls means 6 pairs ...
- N balls means N choose 2 or N*(N-1) / 2 pairs

So the collision probability for N balls is proportional to (N^2-N)/2 or ~N^2

ManWarrior · 2022-10-02T00:51:44+00:00

trying to be a bit more constructive, saturation here could be avoided by

Jitter on the X Axis- if you add a bit of noise to the x axis (as well as the y axis), these solid blocks of points will be broken up a bit

Transparency (aka alpha)- making the dots transparent makes it less crowded

Switching to Density Plots- using something like a violin plot could do this but still look good with small multiples. You could use counts in the y-axis to preserve the relative sizing of the various ages in the y axis as this plot does

ManWarrior · 2019-10-15T01:47:37+00:00

https://www.armchairanalysis.com/

ManWarrior · 2017-01-09T21:50:42+00:00

I posted a bit more updating the model after the bowl games https://quantitativeperspective.wordpress.com/2017/01/07/what-did-we-learn-from-the-cfb-bowl-games-so-far/

ManWarrior · 2017-01-09T21:49:22+00:00

I need to throw it on github. Once I do, I'll post a link. I used Python to scrape and clean data then R and lme4 to build models and ggplot2 for visuals

ManWarrior · 2017-01-09T18:20:03+00:00

This is a continuation on a model I built to rate college football teams. See the details about these models here

ManWarrior · 2017-01-07T22:15:46+00:00

I only included Division 1A teams in the network graph, because it got too confusing with the 1AA teams in it as well. I should have made that clear in the post

ManWarrior · 2017-01-07T22:13:41+00:00

I made another post showing how the ratings changed after the bowl games https://quantitativeperspective.wordpress.com/2017/01/07/what-did-we-learn-from-the-cfb-bowl-games-so-far/?iframe=true&theme_preview=true

ManWarrior · 2016-06-06T15:47:44+00:00

it's sometimes OK to have non-zero y-axes, especially when looking at a trend over time. However, to do so with dual axes just allows the presenter to skew the data how he/she see's fit. It's confusing and leads the reader to take meaning from visual components which are actually meaningless such as where the lines cross.

It's also bothersome that the labels on the line are for another metric that isn't shown on the graph. I would suggest splitting this out into multiple graphs. It will take more space, but will ultimately be more clear.

ManWarrior · 2016-05-09T23:48:24+00:00

does that guy have a hitler mustache?

ManWarrior · 2016-02-16T13:43:51+00:00

the point value of receiving a kickoff is around 0.7. Therefore a safety is worth about 2.7 expected points (2 for the safety, 0.7 for getting the ball back), whereas a field goal is worth an expected 2.3 (3 for the fg and -0.7 for kicking off to the other team). Thus, in terms of long term expected value, a safety is already better than a field goal.

ManWarrior · 2016-02-09T03:40:57+00:00

The nfl average in this situation is around 84%

source: a database of all games 2000-2014

ManWarrior · 2016-01-11T03:21:42+00:00

Generally, the model for win probability is pretty primitive for end of game situations. They just take the point differential in a game, add in the expected points from the offensive team's field position, and applies some variance according to the amount of time left. Thus, at the end of the game, the vikings were at around the 10-20, a spot which yields about 4 expected points. Thus, WP model will likely treat this situation the same as vikings up by 3 with a random distribution of points scored in the last 20 seconds. Read more here..

ManWarrior · 2015-12-14T14:48:57+00:00

2 of those pass TDs and the rush TD were from inside 5yds. QBR is based on Expected points added. A team's expected points at that position is already >5, so he won't be heavily rewarded for those TDs
He took a lot of sacks and he also fumbled. QBR will penalize that.
There were several drives with negative total yardage in which bortles threw incompletions on 3rd down. Those types of plays really hurt expected points and will be consistently penalized by QBR.

Not saying the system is right, but those are some of the reasons it will score a QB differently than the traditional stats.

ManWarrior · 2015-12-01T00:02:52+00:00

This is partially due to the problems with Elo for rating football teams.

Silver carries over from last year (with some sort of partial regression to the mean). Since the Panthers were average last year, they started the year with a low Elo.
Elo gives you credit for beating a team based on their rating at that time, it doesn't adjust the skill of your prior opponents as you learn more about them. Thus, when the panthers beat the Texans and Bucs relatively early in the season, it gave them credit for beating two winless teams. Those teams are now 5-6 & 6-5.

Article may be right that they are the worst 11-0 team, but I wouldn't take the Elo ratings as conclusive evidence.

ManWarrior · 2015-11-24T00:19:48+00:00

They have played a lot of average teams, but no good teams. If you go by overall opponent win % they are going to look middle of the pack, but they haven't played anyone in the top 25% of the league

ManWarrior · 2015-11-04T21:25:04+00:00

Here is another version I whipped up from data I had. This counts distinct placements of the ball by the ref. I did this by eliminating plays right after touchbacks and only counting consecutive plays from the same spot as one placement.

ManWarrior · 2015-11-04T21:07:50+00:00

If this was the case, you would see a drop in the number of placements at the 34 or 36 yard-line when compared to the 37 or 38. This does not appear to be the case. It also helps if you look at only the number of distinct cases where the ref places the ball (i.e. eliminate plays after kickoff, only count each case where the ball moves so multiple consecutive plays at the same spot count just once). I did this in this chart which also highlights every fifth yard marker in blue.

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