Just a sanity check as I have to do a few computations for a report manually.

Our indicator is defined in the following way: # re-admissions / #initial visits. I have a person level data set that has this information already summarized.

Here is my data set (mock)

Code:

```
ID Visits Readmission
1 3 2
2 0 0
3 1 0
4 2 2
5 0 0
```

How would I arrive at a standard deviation of this statistic? I'm assuming the counts are Poisson so would it just be the square root of 2/3? sqrt(2/3) = 0.816?

Thanks in advance