Posts from March 2021 (28)

March 30, 2021

NRL Predictions for Round 4

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Team Ratings for Round 4

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.

Current Rating Rating at Season Start Difference
Roosters 12.97 10.25 2.70
Storm 12.97 14.53 -1.60
Panthers 10.61 8.88 1.70
Rabbitohs 9.28 7.73 1.50
Raiders 5.93 6.98 -1.00
Eels 4.34 1.68 2.70
Warriors -0.30 -1.84 1.50
Sharks -1.06 -0.76 -0.30
Knights -2.42 -2.61 0.20
Dragons -3.56 -4.95 1.40
Titans -4.26 -7.22 3.00
Wests Tigers -4.38 -3.07 -1.30
Sea Eagles -8.87 -4.77 -4.10
Broncos -9.55 -11.16 1.60
Bulldogs -11.48 -7.62 -3.90
Cowboys -12.23 -8.05 -4.20

Performance So Far

So far there have been 24 matches played, 17 of which were correctly predicted, a success rate of 70.8%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Panthers vs. Storm Mar 25 12 – 10 0.30 TRUE
2 Dragons vs. Sea Eagles Mar 26 38 – 12 4.70 TRUE
3 Rabbitohs vs. Roosters Mar 26 26 – 16 -3.00 FALSE
4 Raiders vs. Warriors Mar 27 31 – 34 11.80 FALSE
5 Broncos vs. Bulldogs Mar 27 24 – 0 1.00 TRUE
6 Eels vs. Sharks Mar 27 28 – 4 5.10 TRUE
7 Knights vs. Wests Tigers Mar 28 20 – 24 6.90 FALSE
8 Cowboys vs. Titans Mar 28 8 – 44 1.20 FALSE

Predictions for Round 4

Here are the predictions for Round 4. 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.

Game Date Winner Prediction
1 Sea Eagles vs. Panthers Apr 01 Panthers -16.50
2 Bulldogs vs. Rabbitohs Apr 02 Rabbitohs -17.80
3 Storm vs. Broncos Apr 02 Storm 25.50
4 Sharks vs. Cowboys Apr 03 Sharks 14.20
5 Titans vs. Raiders Apr 03 Raiders -7.20
6 Knights vs. Dragons Apr 04 Knights 4.10
7 Roosters vs. Warriors Apr 04 Roosters 16.30
8 Wests Tigers vs. Eels Apr 05 Eels -5.70

Top 14 Predictions for Round 21

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Team Ratings for Round 21

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.

Current Rating Rating at Season Start Difference
Stade Toulousain 8.10 4.80 3.30
Clermont Auvergne 7.03 3.22 3.80
La Rochelle 6.35 2.32 4.00
Racing-Metro 92 5.49 6.21 -0.70
Lyon Rugby 4.95 5.61 -0.70
Bordeaux-Begles 3.43 2.83 0.60
RC Toulonnais 2.47 3.56 -1.10
Montpellier 2.17 2.30 -0.10
Stade Francais Paris -1.03 -3.22 2.20
Castres Olympique -1.28 -0.47 -0.80
Brive -2.03 -3.26 1.20
Section Paloise -3.47 -4.48 1.00
Aviron Bayonnais -6.13 -4.13 -2.00
SU Agen -15.49 -4.72 -10.80

 

Performance So Far

So far there have been 140 matches played, 93 of which were correctly predicted, a success rate of 66.4%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Aviron Bayonnais vs. Racing-Metro 92 Mar 28 23 – 13 -7.30 FALSE
2 Bordeaux-Begles vs. La Rochelle Mar 28 11 – 26 3.80 FALSE
3 Brive vs. SU Agen Mar 28 57 – 3 16.90 TRUE
4 Castres Olympique vs. Section Paloise Mar 28 38 – 33 8.10 TRUE
5 Lyon Rugby vs. RC Toulonnais Mar 28 54 – 16 6.10 TRUE
6 Stade Francais Paris vs. Clermont Auvergne Mar 28 27 – 34 -1.80 TRUE
7 Stade Toulousain vs. Montpellier Mar 28 16 – 29 13.00 FALSE

 

Predictions for Round 21

Here are the predictions for Round 21. 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.

Game Date Winner Prediction
1 Castres Olympique vs. Stade Toulousain Apr 18 Stade Toulousain -3.90
2 Clermont Auvergne vs. Brive Apr 18 Clermont Auvergne 14.60
3 La Rochelle vs. Lyon Rugby Apr 18 La Rochelle 6.90
4 Montpellier vs. RC Toulonnais Apr 18 Montpellier 5.20
5 Racing-Metro 92 vs. Stade Francais Paris Apr 18 Racing-Metro 92 12.00
6 Section Paloise vs. Aviron Bayonnais Apr 17 Section Paloise 8.20
7 SU Agen vs. Bordeaux-Begles Apr 18 Bordeaux-Begles -13.40

 

Super Rugby Predictions for Week 7

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Team Ratings for Week 7

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.

Current Rating Rating at Season Start Difference
Crusaders 15.93 14.49 1.40
Blues 8.23 7.80 0.40
Hurricanes 6.13 7.13 -1.00
Chiefs 4.28 4.38 -0.10
Brumbies 3.20 1.47 1.70
Reds 2.67 1.59 1.10
Highlanders 1.91 2.70 -0.80
Rebels -3.22 -3.51 0.30
Waratahs -8.59 -5.02 -3.60
Western Force -12.57 -13.05 0.50

 

Performance So Far

So far there have been 22 matches played, 16 of which were correctly predicted, a success rate of 72.7%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Highlanders vs. Hurricanes Mar 26 19 – 30 2.20 FALSE
2 Brumbies vs. Western Force Mar 26 42 – 14 20.70 TRUE
3 Chiefs vs. Blues Mar 27 15 – 12 1.40 TRUE
4 Waratahs vs. Reds Mar 27 14 – 46 -4.00 TRUE

 

Predictions for Week 7

Here are the predictions for Week 7. 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.

Game Date Winner Prediction
1 Crusaders vs. Highlanders Apr 02 Crusaders 19.50
2 Waratahs vs. Brumbies Apr 02 Brumbies -6.30
3 Blues vs. Hurricanes Apr 03 Blues 7.60
4 Rebels vs. Reds Apr 03 Reds -0.40

 

Rugby Premiership Predictions for Round 16

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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.

Current Rating Rating at Season Start Difference
Exeter Chiefs 5.43 7.35 -1.90
Bristol 4.08 1.28 2.80
Harlequins 4.08 -1.08 5.20
Sale Sharks 4.03 4.96 -0.90
Northampton Saints 0.59 -2.48 3.10
Wasps -0.62 5.66 -6.30
Bath -1.22 2.14 -3.40
Gloucester -3.16 -1.02 -2.10
Leicester Tigers -3.85 -6.14 2.30
London Irish -5.55 -8.05 2.50
Newcastle Falcons -7.35 -10.00 2.70
Worcester Warriors -9.55 -5.71 -3.80

 

Performance So Far

So far there have been 83 matches played, 50 of which were correctly predicted, a success rate of 60.2%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Bristol vs. Harlequins Mar 28 35 – 33 5.00 TRUE
2 Gloucester vs. Exeter Chiefs Mar 27 34 – 18 -6.30 FALSE
3 Leicester Tigers vs. Newcastle Falcons Mar 29 26 – 12 7.20 TRUE
4 London Irish vs. Bath Mar 28 36 – 33 -0.40 FALSE
5 Wasps vs. Sale Sharks Mar 28 19 – 20 0.00 FALSE
6 Worcester Warriors vs. Northampton Saints Mar 28 14 – 62 -1.50 TRUE

 

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.

Game Date Winner Prediction
1 Bath vs. Leicester Tigers Apr 19 Bath 7.10
2 Exeter Chiefs vs. Wasps Apr 18 Exeter Chiefs 10.60
3 Harlequins vs. Worcester Warriors Apr 18 Harlequins 18.10
4 Newcastle Falcons vs. Bristol Apr 18 Bristol -6.90
5 Northampton Saints vs. London Irish Apr 17 Northampton Saints 10.60
6 Sale Sharks vs. Gloucester Apr 17 Sale Sharks 11.70

 

March 23, 2021

Super Rugby Predictions for Week 6

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Team Ratings for Week 6

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.

Current Rating Rating at Season Start Difference
Crusaders 15.93 14.49 1.40
Blues 8.33 7.80 0.50
Hurricanes 5.65 7.13 -1.50
Chiefs 4.19 4.38 -0.20
Brumbies 2.91 1.47 1.40
Highlanders 2.39 2.70 -0.30
Reds 1.80 1.59 0.20
Rebels -3.22 -3.51 0.30
Waratahs -7.73 -5.02 -2.70
Western Force -12.28 -13.05 0.80

 

Performance So Far

So far there have been 18 matches played, 13 of which were correctly predicted, a success rate of 72.2%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Rebels vs. Waratahs Mar 19 33 – 14 9.30 TRUE
2 Hurricanes vs. Chiefs Mar 20 29 – 35 8.00 FALSE
3 Reds vs. Western Force Mar 20 26 – 19 20.50 TRUE
4 Blues vs. Crusaders Mar 21 27 – 43 -1.10 TRUE

 

Predictions for Week 6

Here are the predictions for Week 6. 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.

Game Date Winner Prediction
1 Highlanders vs. Hurricanes Mar 26 Highlanders 2.20
2 Brumbies vs. Western Force Mar 26 Brumbies 20.70
3 Chiefs vs. Blues Mar 27 Chiefs 1.40
4 Waratahs vs. Reds Mar 27 Reds -4.00

 

Rugby Premiership Predictions for Round 15

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Team Ratings for Round 15

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.

Current Rating Rating at Season Start Difference
Exeter Chiefs 6.55 7.35 -0.80
Bristol 4.32 1.28 3.00
Sale Sharks 3.94 4.96 -1.00
Harlequins 3.85 -1.08 4.90
Wasps -0.54 5.66 -6.20
Bath -0.95 2.14 -3.10
Northampton Saints -1.50 -2.48 1.00
Leicester Tigers -4.25 -6.14 1.90
Gloucester -4.29 -1.02 -3.30
London Irish -5.82 -8.05 2.20
Newcastle Falcons -6.94 -10.00 3.10
Worcester Warriors -7.46 -5.71 -1.70

 

Performance So Far

So far there have been 77 matches played, 47 of which were correctly predicted, a success rate of 61%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Bath vs. Worcester Warriors Mar 21 47 – 22 9.40 TRUE
2 Exeter Chiefs vs. Leicester Tigers Mar 21 47 – 31 15.20 TRUE
3 Harlequins vs. Gloucester Mar 21 59 – 24 10.20 TRUE
4 Newcastle Falcons vs. Wasps Mar 21 18 – 20 -1.90 TRUE
5 Northampton Saints vs. Bristol Mar 21 21 – 28 -0.50 TRUE
6 Sale Sharks vs. London Irish Mar 21 41 – 13 12.60 TRUE

 

Predictions for Round 15

Here are the predictions for Round 15. 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.

Game Date Winner Prediction
1 Bristol vs. Harlequins Mar 28 Bristol 5.00
2 Gloucester vs. Exeter Chiefs Mar 27 Exeter Chiefs -6.30
3 Leicester Tigers vs. Newcastle Falcons Mar 29 Leicester Tigers 7.20
4 London Irish vs. Bath Mar 28 Bath -0.40
5 Wasps vs. Sale Sharks Mar 28 Wasps 0.00
6 Worcester Warriors vs. Northampton Saints Mar 28 Northampton Saints -1.50

 

Pro14 Predictions for the Final and Postponed Matches

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Team Ratings for the Final and Postponed Matches

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.

Current Rating Rating at Season Start Difference
Leinster 15.68 16.52 -0.80
Munster 9.76 9.90 -0.10
Ulster 8.80 4.58 4.20
Edinburgh 3.92 5.49 -1.60
Connacht 2.47 0.70 1.80
Glasgow Warriors 2.11 5.66 -3.60
Cardiff Blues 0.72 0.08 0.60
Scarlets 0.59 1.98 -1.40
Cheetahs -0.46 -0.46 0.00
Ospreys -0.76 -2.82 2.10
Dragons -6.69 -7.85 1.20
Treviso -6.70 -3.50 -3.20
Zebre -14.52 -15.37 0.80
Southern Kings -14.92 -14.92 0.00

 

Performance So Far

So far there have been 94 matches played, 63 of which were correctly predicted, a success rate of 67%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Munster vs. Treviso Mar 20 31 – 17 23.90 TRUE
2 Leinster vs. Ospreys Mar 20 19 – 24 24.90 FALSE
3 Ulster vs. Zebre Mar 20 49 – 3 28.50 TRUE
4 Dragons vs. Glasgow Warriors Mar 22 26 – 17 -3.30 FALSE
5 Cardiff Blues vs. Edinburgh Mar 23 34 – 15 2.00 TRUE
6 Scarlets vs. Connacht Mar 23 41 – 36 4.50 TRUE

 

Predictions for the Final and Postponed Matches

Here are the predictions for the Final and Postponed Matches. 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.

Game Date Winner Prediction
1 Dragons vs. Edinburgh Mar 29 Edinburgh -6.90
2 Glasgow Warriors vs. Treviso Mar 28 Glasgow Warriors 14.90
3 Leinster vs. Munster Mar 28 Leinster 10.90

 

NRL Predictions for Round 3

By

Team Ratings for Round 3

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.

Current Rating Rating at Season Start Difference
Roosters 14.11 10.25 3.90
Storm 13.14 14.53 -1.40
Panthers 10.44 8.88 1.60
Rabbitohs 8.14 7.73 0.40
Raiders 7.23 6.98 0.30
Eels 2.71 1.68 1.00
Sharks 0.57 -0.76 1.30
Knights -1.45 -2.61 1.20
Warriors -1.59 -1.84 0.30
Wests Tigers -5.34 -3.07 -2.30
Dragons -5.39 -4.95 -0.40
Sea Eagles -7.04 -4.77 -2.30
Titans -7.37 -7.22 -0.10
Cowboys -9.12 -8.05 -1.10
Bulldogs -9.51 -7.62 -1.90
Broncos -11.52 -11.16 -0.40

 

Performance So Far

So far there have been 16 matches played, 13 of which were correctly predicted, a success rate of 81.2%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Eels vs. Storm Mar 18 16 – 12 -9.90 FALSE
2 Warriors vs. Knights Mar 19 16 – 20 0.70 FALSE
3 Titans vs. Broncos Mar 19 28 – 16 6.10 TRUE
4 Bulldogs vs. Panthers Mar 20 0 – 28 -14.60 TRUE
5 Sea Eagles vs. Rabbitohs Mar 20 12 – 26 -11.70 TRUE
6 Cowboys vs. Dragons Mar 20 18 – 25 0.70 FALSE
7 Wests Tigers vs. Roosters Mar 21 6 – 40 -12.80 TRUE
8 Sharks vs. Raiders Mar 21 10 – 12 -4.10 TRUE

 

Predictions for Round 3

Here are the predictions for Round 3. 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.

Game Date Winner Prediction
1 Panthers vs. Storm Mar 25 Panthers 0.30
2 Dragons vs. Sea Eagles Mar 26 Dragons 4.70
3 Rabbitohs vs. Roosters Mar 26 Roosters -3.00
4 Raiders vs. Warriors Mar 27 Raiders 11.80
5 Broncos vs. Bulldogs Mar 27 Broncos 1.00
6 Eels vs. Sharks Mar 27 Eels 5.10
7 Knights vs. Wests Tigers Mar 28 Knights 6.90
8 Cowboys vs. Titans Mar 28 Cowboys 1.20

 

March 22, 2021

Prior beliefs and evidence

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Remember the bin lid?

Case C tested positive in MIQ at their day-12 test. They had a room next door to D and D’s child, E. D is the person who was initially thought to have been infected by touching a bin lid that C had also touched some 20 hours before.

There’s now a published paper by Jemma Geohegan and numerous co-workers, and Siouxsie Wiles has an explainer at the Spinoff:

Now we know that SARS-CoV-2 is airborne, a much more likely scenario is that case D was infected by exposure to airborne virus shed by case C. 

CCTV footage showed that C and D were never outside their MIQ rooms at the same time. But they both got their day 12 swabs taken on the same day. And these were taken from their doorways. C was tested first. Then there was a 50-second window between them closing their door and D opening theirs to be swabbed. It looks like having the hotel room doors open for as long as it took to be swabbed was enough to move airborne virus from C and their room into the enclosed and unventilated corridor and then on to D and into their room. From the genome sequencing, it looks like D then infected their child, E, and another household member, F. 

This might seem strange: we know there was a contaminated bin lid, and the opportunity for airborne* transmission was pretty marginal, so why are we concluding it was airborne*?

Back last year, scientists and public health people worked on the assumption that the Covid virus could spread via contaminated surfaces, because lots of microbes do and it’s a relatively easy fix.  Some of us went as far as washing individual tomatoes when we got them back from the supermarket.  It became clear fairly quickly that airborne*  transmission was important; there were some smoking-gun examples that couldn’t be explained any other way.  It took a lot longer to decide that contaminated surfaces were pretty much never important, because most cases that could have been surface transmission could also have been airborne* transmission. Still, there were no smoking-gun cases of transmission by contaminated surfaces, and you’d expect a few unless it was very rare.

As the numbers of active infections rose, it became harder to track down causes for any individual case.  Except, in New Zealand, it didn’t.  Since the end of the first outbreak we have had a very small number of cases, small enough that contact tracing and genome sequencing is possible for every person involved, plus the sort of hotel surveillance that’s unusual in the public sector outside prisons.  Here, it is possible to track most individual transmissions. So, the ‘bin lid’ case was interesting because it looked like an unambiguous case of transmission from a contaminated surface.

What we know now is that it wasn’t. That is, it wasn’t an unambiguous case of transmission from a contaminated surface; it could have been airborne*  transmission.  The ‘bin lid’ case

  • definitely isn’t the smoking gun for surface transmission that it first appeared
  • and so, based on everything else we know, probably was airborne*  transmission

It’s not that we have strong evidence for airborne*  transmission from the facts of this specific case, but we don’t have strong evidence against it, and other evidence definitely points that way.

 

 

* for some definition of the word, let’s not be dicks about it.

March 16, 2021

Top 14 Predictions for Round 20

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Team Ratings for Round 20

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.

Current Rating Rating at Season Start Difference
Stade Toulousain 8.90 4.80 4.10
Clermont Auvergne 6.67 3.22 3.50
Racing-Metro 92 6.08 6.21 -0.10
La Rochelle 5.72 2.32 3.40
Bordeaux-Begles 4.07 2.83 1.20
Lyon Rugby 4.01 5.61 -1.60
RC Toulonnais 3.41 3.56 -0.20
Montpellier 1.37 2.30 -0.90
Stade Francais Paris -0.67 -3.22 2.60
Castres Olympique -1.06 -0.47 -0.60
Brive -3.08 -3.26 0.20
Section Paloise -3.69 -4.48 0.80
Aviron Bayonnais -6.73 -4.13 -2.60
SU Agen -14.44 -4.72 -9.70

 

Performance So Far

So far there have been 133 matches played, 89 of which were correctly predicted, a success rate of 66.9%.
Here are the predictions for last week’s games.

Game Date Score Prediction Correct
1 Aviron Bayonnais vs. SU Agen Mar 14 48 – 20 12.20 TRUE

 

Predictions for Round 20

Here are the predictions for Round 20. 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.

Game Date Winner Prediction
1 Aviron Bayonnais vs. Racing-Metro 92 Mar 28 Racing-Metro 92 -7.30
2 Bordeaux-Begles vs. La Rochelle Mar 28 Bordeaux-Begles 3.80
3 Brive vs. SU Agen Mar 28 Brive 16.90
4 Castres Olympique vs. Section Paloise Mar 28 Castres Olympique 8.10
5 Lyon Rugby vs. RC Toulonnais Mar 28 Lyon Rugby 6.10
6 Stade Francais Paris vs. Clermont Auvergne Mar 28 Clermont Auvergne -1.80
7 Stade Toulousain vs. Montpellier Mar 28 Stade Toulousain 13.00

 

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