# [R] [FORGED] Equality of two probabilities (proportions?)

mamuash bukana mamushbukana at gmail.com
Fri Feb 10 12:27:31 CET 2017

```Suppose we calculate probability of an event using Binomial
distribution and got p1. Then probability of that same event is
calculated using the Normal approximation to Binomial and got p2.
Can't we evaluate the goodness of our approximation by comparing the
difference between p1&p2? If yes, how to implement this in R?

I wouldn't have been here seeking for help if I had that "deep"
understanding of the issue under question Rolf!

M

On Fri, Feb 10, 2017 at 10:42 AM, Rolf Turner <r.turner at auckland.ac.nz> wrote:
>
> On 10/02/17 21:12, mamuash bukana wrote:
>
>> Dear R users,
>> I wanted to test if there is significant difference between
>> probabilities of the same event calculated in different ways. I am
>> aware about the prop.test() which does the comparison between two
>> proportions given the number of successes and sample sizes. But in my
>> case the only values I do have are the probabilities the event.
>>
>> Your kind suggestions will be very appreciated.
>
>
> I think that it is pretty clear from your question that you are way out of
> your depth and that you do not understand the concept of "significant
> difference".
>
> You should therefore seek help from a competent local statistician.
>
> Although I could be wrong about my estimate of your depth of understanding,
> it is at the very least true that you need to read the posting guide
> carefully and learn how to ask a question that actually makes sense,
> includes necessary details, and gives list members a fighting chance of
>
> cheers,
>
> Rolf Turner
>
> --
> Technical Editor ANZJS
> Department of Statistics
> University of Auckland
> Phone: +64-9-373-7599 ext. 88276

```