I don’t follow the numbers as closely as you do. Do the government genuinely use data that’s a week old to form the basis of their decision making? That’s just mind blowing if true. No wonder it’s a shit show.
Case data published daily and you see mentioned on the news is the number from the tests processed in the past 24 hours. But those tests may date back to one of several days over the past week as to when they were done.
So the number cited is correct as is the overall running total of cases in any location but they are 'assigned' to the day before reporting when in reality they will have been split across several of the past days.
Much the same happens with the deaths. Today in England 416 hospital deaths were reported and is the number on all the media reports. But only 55 of those happened yesterday. And 190 of them happened on 21 December. And 64 of them on 20 December and so on back across quite a few dates. Some today as far back as April.
Obviously this can get very confusing as these add ons mean you could wait months to report the true number who died the day before. These are recorded but they are never really final numbers -although after a week or so they tend not to increase a great deal - just in ones or twos now and then.
So the number of deaths across the pandemic in the UK - 69, 051 as of today in the UK IS accurate. But the 744 in the news today is the number REPORTED as if it occurred yesterday although only a handful of them did. In a week or so you will get a fairly accurate count of how many DID die yesterday in England hospitals. It will not be 744 and could be a lot less or a lot more and still might go up with more added even into January.
With the cases the number reported today is the number of positive tests reported back yesterday but hardly any will actually be tests DONE yesterday and will be from several dates added together. But again like deaths the overall number of cases for any area or region reported as a total today will still be correct as of today. So that number get reported as if they happened yesterday when like the deaths most will not have.
Both sets of data are recorded and tell you different things but for one you have to wait five or six days before the actual number on that date is reasonable clarified. With the other you know immediately.
They both have things to tell you but if you are tracking how fast a place is building up cases (the Pop Score data which records this) then your choice is to track the accurate numbers that will have to be 6 days or so old to be reasonably accurate. Or the share of the correct total number allocated to yesterday that creates today's totally accurate cumulative number of cases.
The government usually base their graphs and statements on the best accurate 5 day old data so are running 6 days back on reporting cases. I report here on the as reported today from yesterday total cases because they give you a picture of what is happening this week. Not 100% accurately day to day. But in terms of now (as in past few days) more up to date than the accurate numbers that are always from last week
Scientists love accuracy - and of course I see why that matters so do look at it too. But I post what is happening now because I feel in a pandemic it often clues you up days ahead of the picture visible from the other data that is literally so last week.