Posts filed under General (2986)

Team Ratings for Week 2

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Performance So Far

So far there have been 5 matches played, 4 of which were correctly predicted, a success rate of 80%.
Here are the predictions for last week’s games.

Predictions for Week 2

Here are the predictions for Week 2. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

• CDC’s “disease detectives” halved as part of DOGE cuts at health agencies
• Bird flu seen in cow veterinarians
• Louisiana will no longer promote mass vaccination (paywalled original)
• Measles outbreak continues to expand in Texas

Team Ratings for Week 11

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Performance So Far

So far there have been 78 matches played, 58 of which were correctly predicted, a success rate of 74.4%.
Here are the predictions for last week’s games.

Predictions for Week 11

Here are the predictions for Week 11. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

Team Ratings for Week 1

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Predictions for Week 1

Here are the predictions for Week 1. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

Team Ratings for Delayed Games

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Performance So Far

So far there have been 77 matches played, 57 of which were correctly predicted, a success rate of 74%.
Here are the predictions for last week’s games.

Predictions for Delayed Games

Here are the predictions for Delayed Games. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

Team Ratings for Round 16

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Performance So Far

So far there have been 105 matches played, 80 of which were correctly predicted, a success rate of 76.2%.
Here are the predictions for last week’s games.

Predictions for Round 16

Here are the predictions for Round 16. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

Team Ratings for Round 12

The basic method is described on my Department home page.
Here are the team ratings prior to this week’s games, along with the ratings at the start of the season.

Performance So Far

So far there have been 55 matches played, 36 of which were correctly predicted, a success rate of 65.5%.
Here are the predictions for last week’s games.

Predictions for Round 12

Here are the predictions for Round 12. The prediction is my estimated expected points difference with a positive margin being a win to the home team, and a negative margin a win to the away team.

The Herald (from the Telegraph) says People with divorced parents are at greater risk of strokes, study finds

The study is here and the press release is here. It uses 2022 data from a massive annual telephone survey of health in the US, the Behavioral Risk Factor Surveillance System, “BRFSS” to its friends.

Using BRFSS means that the data are representative of the US population, which is useful.  On the other hand, you’re limited to variables that can be assessed over the phone.  That’s fine for age, and probably fine for parental divorce.  It’s known to be a bit biased for BMI and weight. The telephone survey doesn’t even try to collect blood pressure, cholesterol, or oral contraceptive use, all known to be risk factors for stroke.  And if you call people up on the phone and ask if they’ve ever had a stroke, you tend to miss the people whose strokes were fatal or incapacitating (about a quarter of people die immediately or within a year if they have a stroke).

Still, the researchers collected some useful variables to try to adjust away the differences between people with and without divorced parents.  As usual, we have to worry about whether they went too far — for example, if the mechanism was via diabetes or depression, then adjusting for diabetes or depression would induce bias in the results.

This sort of research can be useful as a first step, to see if it’s worth doing an analysis using more helpful data from a study that followed people up over time — either a birth cohort study or a heart-disease cohort study.  It’s interesting as initial news that there’s a relationship — though you also might think adverse effects of divorce would get smaller in recent decades as divorce became less noteworthy.

All this is background for my main point.  While looking for links to published papers, I found that one of the same researchers had done the same sort of analysis with the BRFSS data from 2010 and published it in 2012. They found a stronger association twelve years ago than now.  I don’t know about you, but I would have appreciated this fact being in the press release and in the news story.

Listening to the Slate Money podcast, I heard about an interesting survey result

Elizabeth Spiers:  My number is 73 and that’s percent and that’s the number of men in a recent YouGov survey who say they do most of the chores in their household.

I found a Washington Post story

60 percent of women who live with a partner say they do all or most of the chores. But 73 percent of similarly situated men say that they do the most — or that they share chores equally.

Here’s the top few lines of the YouGov table

Breaking out advanced statistical software, 23%+19% is 42%, and 33%+30% is 63%. The figure for women matches the story, allowing for reasonable rounding. The figure for men doesn’t?

If we add in “shared equally”, which is given as 33% for men and 22% for women we can get to 75% “all” or “most” or “equally” for men, but 83% “all” or “most” or “equally” for women.  And while the story is supposed to be that men say they are doing more and are delusional, the reported table has more work self-reported by women than men at all levels. It’s still possible, of course, that some the 42% of men claiming to do all or most chores are not fully aware of the situation, but the message that makes the results headline-worthy is not in the data.

The Washington Post story is still well worth reading — it uses the YouGov poll as a hook to discuss much more detailed data from the American Time Use Survey, which has the advantage that people write down contemporaneously what they are doing for an actual two weeks rather than trying to guess at an average.

• Another example of asking people questions they can’t reasonably be expected to answer, at Newsroom. This is a survey from Forest and Bird, who asked about the proportion of NZ’s ocean that was, and that should be, in marine reserves.  The actual figure is 0.4%. People thought it was a lot more, and that it should be a lot more.  It’s possible the current general population estimate has been influenced by the Kermadec reserve that was proposed by the last government, which would have protected 15%, but I didn’t remember that figure so I don’t know.   The “Not Sure” figure for how much is currently protected is 23%, which is larger than you often see, but clearly still smaller than it should have been. Survey interviewers often push quite hard to get people to give a concrete answer, but I don’t know if that happened here
• A good post about the cost of false positives, in this case in detecting spammers on social media.
• Useful tools for interpreting the news: Molly White writes about cryptocurrency market caps and what they mean and don’t mean.
• Outside the usual range of StatsChat, but about the value of official statistics in policy debates.  Bret Devereaux (who you should read if you have any interest in ancient history or its depiction in movies and video games) is writing about the Gracchi, the land reformers of the 2nd century BCE.

Except notice the data points being used to come up with this story: the visible population of landless men in Rome and the Roman census returns. But, as we’ve discussed, the Roman census is self-reported, and the report of a bit of wealth like a small farm is what makes an individual liable for taxes and conscription.

In short the story we have above is an interpretation of the available data but not the only one and both our sources and Tiberius Gracchus simply lack the tools necessary to gather the information they’d need to sound out if their interpretation is correct.