I have this data and calculated binom, but am very confused with the value
(at least 5, q =4, q=5, q =6??) and parameters? Can someone explain how to
plug in the va;ues and parameters?
Hospital # Tested # Positive # Positive (per 1000) A 3741 30 8 C 5006
11 2.2
If 500 newborns are screened at Hospital A, the exact binomial probability
of at least 5 HIV-positive would be:
Pr ( X >= q | X ~ Binom(size, prob))
Pr (X >=5 |X ~ Binom(500, 0.008))
pbinom(q, size, prob, lower.tail =TRUE, log.p = FALSE)
> pbinom(q=5, size=500, prob=0.008, lower.tail =TRUE, log.p = FALSE)
[1] 0.7857602
If 500 newborns are screened at Hospital C, the exact binomial probability
of at least 5 HIV-positive would be:
Pr ( X >= q | X ~ Binom(size, prob))
Pr (X >=5 |X ~ Binom(500, 0.0022))
pbinom(q, size, prob, lower.tail =TRUE, log.p = FALSE)
> pbinom(q=5, size=500, prob=0.0022, lower.tail =TRUE, log.p = FALSE)
[1] 0.9990512
thx much
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