So not so much a #ContactTracing app as a feature-creeping Christmas tree?
One thing about tech that's successful is that it is ultimately successful because it performs the core function it (cl)aims to provide well.
#efficacious ≠ #effectiveness
In case you're wondering, "Detection rate" refers to detecting other #phones with the app installed, not the #virus:
The #FalseNegative rate is the amount of times the app incorrectly reports a contact as 'non-infectious' when in fact it is / could be...
...and the #FalsePositive rate is how often the app incorrectly reports a contact as 'infectious' when it's not, i.e. a #FalseAlarm.
Basically, what these #ErrorRates tell us is that #Bluetooth ranging is HARD!
Would you trust a #SmokeAlarm that went off wrongly nearly half...
...of the time? And which had nearly a 1in 3 chance of NOT going off when there really was a fire?
Maybe this time @NHSX will publish detailed #performance statistics - 'cos frankly, without them, it'll be hard to believe the #ContactTracing part of this app ain't a crapshoot...
Meanwhile, it's good to see that (as before) the new #DPIA for the #nhsxCovid19app has been published:
gov.uk/government/pub… and that the repositories are up on github.com/nhsx
Regardless of performance, this is the standard of #transparency ALL #COVID19 projects need.
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