I want to find how many people who were surveyed for HIV tested negative.
I have an objective titled as HIV. Where HIV=0 is people who are negative. HIV=1, 2, 3, 4 are different levels of viral load of all people who tested positive.
I want to know of all people who are under the HIV objective, how many have HIV = 0?
I especially want to know how to calculate this value when there are missing values. TIA.
>Solution :
Assuming your data is a vector called HIV:
HIV <- rep(c(0, 1, 2, 3, 4, NA), each = 4)
Which looks like this:
[1] 0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 NA NA NA NA
You can use the following:
prop.table(table(Data)))
To get an table object like this:
HIV
0 1 2 3 4
0.2 0.2 0.2 0.2 0.2