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[–] 4 pts

A positive test has about a 2% chance of also having disease by my reckoning. Am I right? Can't see the answer for lack of twitter account. 1/51 to be exact.

[–] 1 pt

https://pic8.co/sh/2gHKje.png

1/1000 chance of true positive (0.001%) minus 5% false positives.

0.00095%

I think, i'm not a doctor or mathemagician

[–] 0 pt

The patient in front of you had a positive test. 1/1000 it is true positive 50/1000 false positive. 949/1000 are now excluded for negative test.

I estimate the odds now as 1 true positive per 51 true+false positive.

1/51 or about 2%.