General > General Technical Chat
Working From Home - Impacts of Coronavirus
cdev:
This is a very good read, thank you for posting that. Saved and going to print it out and put it in a page protector to have it handy.
--- Quote from: DrG on May 12, 2020, 02:51:58 am ---Pretty decent information about risk of infection. Particularly relevant in these "opening up" times. Written by an immunologist. With references. A 12 min read and no video. From 5 days ago (but updated since). Worthwhile in my view.
The Risks - Know Them - Avoid Them
https://www.erinbromage.com/post/the-risks-know-them-avoid-them?fbclid=IwAR0
--- End quote ---
nctnico:
--- Quote from: Syntax Error on May 14, 2020, 09:00:44 am ---BBC News: Coronavirus antibody test a 'positive development'
https://www.bbc.co.uk/news/health-52656808
--- End quote ---
My wife managed to procure a few Covid-19 antibody tests (according to the documentation they should be 90% accurate) because we got a flu in the beginning of March. We both tested negative but the procedure is more involved than simply putting a drop of blood in a test. The tests needs quite a large amount of blood and I'm still not sure whether I followed the procedures correctly. So no conclusive results. All in all I can't really recommend buying a test. Better wait for a government test program. Oh, and sticking a needle in your finger to draw blood sucks.
DrG:
--- Quote from: nctnico on May 14, 2020, 02:21:11 pm ---
--- Quote from: Syntax Error on May 14, 2020, 09:00:44 am ---BBC News: Coronavirus antibody test a 'positive development'
https://www.bbc.co.uk/news/health-52656808
--- End quote ---
My wife managed to procure a few Covid-19 antibody tests (according to the documentation they should be 90% accurate) because we got a flu in the beginning of March. We both tested negative but the procedure is more involved than simply putting a drop of blood in a test. The tests needs quite a large amount of blood and I'm still not sure whether I followed the procedures correctly. So no conclusive results. All in all I can't really recommend buying a test. Better wait for a government test program. Oh, and sticking a needle in your finger to draw blood sucks.
--- End quote ---
I am interested, how did they define the 90% accuracy? Hope this isn't viewed as off-topic, but it really does interest me and has a lot of bearing on how these tests are advertised.
To many people 90% accurate suggests this result:
But, one can, legitimately, operationally define 90% accuracy to include this result:
I know it seems ridiculous, but there are tests that lean toward the latter result AND they are acceptable if they are very cheap and better tests exists. In that case, they are something along the lines of a cheap screen to select candidates for the more expensive and better test. Also, depending on the the beta weights for the 4 quadrants, the latter result can be quite useful if the cost of a 'miss' is many times the cost of a 'false alarm'
Anybody remember the old Signal Detection Theory stuff with sensitivity and bias?
edit: attachments
nctnico:
--- Quote from: DrG on May 14, 2020, 05:07:10 pm ---
--- Quote from: nctnico on May 14, 2020, 02:21:11 pm ---
--- Quote from: Syntax Error on May 14, 2020, 09:00:44 am ---BBC News: Coronavirus antibody test a 'positive development'
https://www.bbc.co.uk/news/health-52656808
--- End quote ---
My wife managed to procure a few Covid-19 antibody tests (according to the documentation they should be 90% accurate) because we got a flu in the beginning of March. We both tested negative but the procedure is more involved than simply putting a drop of blood in a test. The tests needs quite a large amount of blood and I'm still not sure whether I followed the procedures correctly. So no conclusive results. All in all I can't really recommend buying a test. Better wait for a government test program. Oh, and sticking a needle in your finger to draw blood sucks.
--- End quote ---
I am interested, how did they define the 90% accuracy? Hope this isn't viewed as off-topic, but it really does interest me and has a lot of bearing on how these tests are advertised.
--- End quote ---
The instruction leaflet says 'based on a clinical trial' but I have not been able to find any approval for official use. Only a Canadian government page which says 'under review'.
james_s:
--- Quote from: EEVblog on May 14, 2020, 10:43:15 am ---How many more off-topic posts do I have to delete in this thread before get the message to stay on topic?
--- End quote ---
The whole thread is largely what I'd consider off topic under normal circumstances, but given the extremely broad impacts of what is going on in the world right now I don't know that it's a bad thing necessarily although it would be nice to keep all of the Covid related discussion in one thread rather than having it seeping into everything. Personally I'd be happy to have the entire thread wiped out once this pandemic blows over and things settle into something resembling normal.
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