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Been reading into that M&S outbreak in Northampton. Really weird area for it- 11 new outbreaks in care homes over the last month, first positive case at the factory is May 4th but it peaks less than 2 weeks ago. Following that they hold a press conference on Friday where the director of public health says Greencore were completely "covid-compliant" and blames the outbreak on people socialising outside of work.

213 "asymptomatic" among the 292 cases found in the factory. Or, 210 (rounded down) if you want to split hairs.

A big employer for the area, 3000 staff. Wonder where the meat is coming from.
 

Mr. Tea

Let's Talk About Ceps
Because they ramped up testing there.
Let's just go back to the original claim here, that these localised outbreaks aren't real at all, but are merely the consequence of a non-zero false positive rate and increased testing (for unexplained reasons) in a handful of northern towns and cities. Suppose the FPR is 1% - I have no idea whether this is accurate, but let's say it is - and that this is consistent across all the batches of test material being used in the country. Now obviously you aren't going to declare a new outbreak based purely on the number of positive test results in a given area, because that depends entirely on how many tests have been done. You know that if you test ten times as many people, you're going to get ten times as many positive results, for a given true infection rate plus a given FPR.

I refuse to believe that even Matt Hancock is too stupid to realise this. (Chris Grayling would be a different matter.)
 

mixed_biscuits

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Well are you going to be coy or are you going to tell us what the big secret plan is?

I think the likeliest explanation is that they're trying to fashion a narrative that implies that they have been in control of the virus rather than flailing about, panic-stricken, while the virus does whatever it was going to do anyway.
 

vimothy

yurp
Doesn't it though? I don't remember stats that well but looking at the definition of FP it's the number of wrong positives as a ratio of the total number of negatives. In other words if you had a population with no disease and a false positive ration of 1 percent then that would mean you get 1 percent positive on the test.
yeah but you can't infer those assumptions out of a false positive rate - how accurate is the test (specifically how "sensitive" - i.e., what is the ratio of true positives to positives)? that would tell you how many ppl who tested positive have it. I doubt anyone thinks that number is 0
 

IdleRich

IdleRich
But a false positive rate of 1 percent does literally mean - by definition - that the expected amount of positives on a population with no disease would be 1 percent. I agree that only MB thinks that that is what is happening.
 

vimothy

yurp
it means that the expectation of a false positive is 1%. it doesn't mean that, if you have an overall test result of 1%, 100% of those results are false.
 

IdleRich

IdleRich
It doesn't mean that they ARE all false.... but it means that it is quite possible.
(I'm not saying that this is what is happening but that is the case IF the false positive rate is indeed 1 percent).
 

catalog

Well-known member
I think the likeliest explanation is that they're trying to fashion a narrative that implies that they have been in control of the virus rather than flailing about, panic-stricken, while the virus does whatever it was going to do anyway.
This sounds plausible to me. So this would basically mean that there is a (racist) assumption at the heart of the decision making. And they've maybe picked some northern towns as places where local lockdown needs to happen, cos there's an assumption about spread in non-White and poor areas. But they cannot really blatantly say that. So it's up to some whistle blower to actually reveal it. Unless it's not what's happening at all
 

Mr. Tea

Let's Talk About Ceps
I think the likeliest explanation is that they're trying to fashion a narrative that implies that they have been in control of the virus rather than flailing about, panic-stricken, while the virus does whatever it was going to do anyway.
Well they've fucked that up good and proper, haven't they?

I mean, I agree with you about the flailing. Obviously I don't agree that "the virus does whatever it was going to do anyway", because that leaves the vastly different rates of both infection and death between different countries completely unexplained.
 

mixed_biscuits

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That's what Matthew Syed in his Times article said was the unstateable reason for those lockdowns: a preventative measure.

I think the local lockdowns have been more about the narrative: the govt can't take their foot off the brake completely and have the death rate carry on petering away along the same curve as it wouldn't make sense given their reasons for earlier interventions, so they do things gradatim or by give-and-take eg. we'll let you shop but you have to wear a mask
 
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