Dr Duncan Robertson Profile picture
Mar 26, 2020 6 tweets 2 min read Read on X
Stewart Rose on BBC Radio 4: “There is no shortage of food. Nobody will starve. There is a £1bn more food in people’s larders than there was a couple of weeks ago. What are they doing with it? How much do you need to eat? How much do you need to store away?”
So, saying there is £1 billion more food in than before - what _are_ people doing with it?
theguardian.com/world/2020/mar…

Well...
There are 20 million households in the UK. So, £1 billion divided by 20 million households is £50 per household. Which seems a lot of unnecessary stockpiling. Yes, there is some of that going on, but...
One of the drivers of this is that all the lunches that were cooked by schools and employers those weeks ago are now being cooked at home. There are 60 million people in the UK, so with 20 million households, that's 3 people per household.
So, assuming 5 extra meals per day, that's 5 x 3 meals. Or 15 extra meals being cooked at home. Which is just over £3 per meal, which is expensive for a home-made sandwich, but you need to buy a block of cheese to make that sandwich.
Suddenly, that £1 billion of extra food in peoples houses doesn't seem so silly after all. #panickbuying #panicbuying . But hopefully things should calm down very soon #ORMS

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More from @Dr_D_Robertson

Jun 9, 2023
Data thread from today's @IndependentSage briefing including a discussion on sick pay, the topic of today's discussion. 🧵 Image
Cases and tests. Relatively low.
Caveat that the ONS Covid infection survey has been paused ImageImageImageImage
Hospital admissions. Trend not upward.
Caveat that testing has changed in hospital. ImageImageImageImage
Read 14 tweets
Apr 21, 2023
Covid data presentation for the @IndependentSage briefing on 21 April 2023 🧵 Image
Testing has changed from 1 April 2023, so it is difficult to compare before and after this date.
gov.uk/government/new…
The ONS survey has been 'paused', so we can look at the (less recent, less representative) data on PCR positivity

coronavirus.data.gov.uk/details/testin… ImageImage
Read 11 tweets
Apr 20, 2023
Alright. Another maths thread. And why it's non-trivial to ask exam questions.
🧵
OK. So the 'exam question' is:

"Inflation is currently 10%. If inflation halves, how much will a £1 pint of milk cost".

Sounds easy. It's not. It's ambiguous. It's not a good question. Unless it's designed to be a bad question. In which case it's a good question.
1. It talks about 'inflation'. But *what* inflation? At the moment, we have overall inflation at roughly 10% but inflation of food at roughly 20%. So is the overall inflation rate the same as the inflation rate for milk? It's not clear. Bad question.
Read 9 tweets
Mar 24, 2023
Data thread from today's @IndependentSage briefing. 🧵
First, the @ONS Covid Infection Survey is being paused, and @CovidGenomicsUK is being retired. This will have implications for data reliability and availability going forward.
Read 17 tweets
Mar 20, 2023
OK, I'm going to write a response to this maths problem, published in @DailyMailUK, that has caused a lot of comment, some thinking the answer is 1 and some thinking the answer is 9.

A thread. 🧵

dailymail.co.uk/news/article-1…
So, what answer is correct? Is it 1 or is it 9?

Many of us would go straight to the answer 1. That's because we know (or our children know, and have taught us), that there is a 'rule' for how you deal with the order of doing the calculation - do you do + first or ÷, for example?
Enter BIDMAS (or BODMAS).

"It stands for Brackets, Indices [or Order], Division, Multiplication, Addition and Subtraction."

That's the conventional order. Forget about indices [or order] for now - that's not important for this one.
bbc.co.uk/bitesize/topic…
Read 12 tweets
Mar 20, 2023
Like it or not, this equation is ambiguous.

The thing about maths (and language for that matter) is you aim to express things elegantly, while being unabiguous.

Unless you're trying not to.
Read 4 tweets

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