funnel_plot function

[sebastian-fox]

https://fingertips.phe.org.uk/profile-group/child-health/profile/child-health-overview/data#page/3/gid/1938133000/pat/6/par/E12000009/ati/102/are/E10000009/iid/91156/age/264/sex/4

Here is an example of an area that will change its significance based on the new funnel plot method (East Riding of Yorkshire)

• Fingertips Significance: Higher than England at 95% confidence
• Old Excel Tool Significance: Higher than England at 95% confidence
• New Excel Tool Significance: Similar to England at 95% confidence

[simonthelwall]

I've got some thoughts about funnel plots that I'd like to see incorporated into the function(s).

Overdispersion is a common problem with the data I analyse. Many funnel plot tools do not handle this. I'd like to see it handled within any funnel plot function(s) as part of this package. I don't really have enough experience to suggest which approach is the most appropriate to take, but options include:

• Negative binomial distribution, when dealing with over-dispersed count data
• Zero-inflated methods for both proportion and count data