# Thread: Distribution of Data

1. ## Re: Distribution of Data

So are you saying that if two players from different groups had the same mean their distributions would potentially be different due to their different grouping? That's kind of what I'm looking for.

Would it be possible to do what you suggest in Excel or do i need to buy a software package? Happy to do so but not sure which one is best.

2. ## Re: Distribution of Data

No, given that it is "confirmed" that the distribution is Poisson and the mean is the same, then it will be the same distribution.

But if the means are different (different skill levels) it can still be Poisson distributed (although with different means).

A Poisson regression model can easily be estimated with R (that together with RStudio can be downloaded free). Show us the data set (correctly specified!) and we will help you. I guess that you can estimate it in excel, since it can be done like iterative-reweighted-least-squares, but that seems like the most difficult path.

3. ## Re: Distribution of Data

Ok I will do some work on the dataset so that each row has:

Player standard grouping (I'll create sensible groupings)
Number of darts -8 so that the minimum is 0

Would this data be correctly specified for the task in hand? Shall I upload it to here? I understand some people are a bit wary of file attachments.

4. ## Re: Distribution of Data

You will need to have two columns, one for the data and one for the skill level (or maybe you have several skill variabels).

I does not matter if the data variable has minimum 8 or minimum 0. But every row must correspond to one player.

Originally Posted by jazzfish
I understand some people are a bit wary of file attachments.
Yes. Maybe you can just paste it in here in a code frame (highlight and click at #) and hide it (highlight and click on "HIDE"). Like this:

Spoiler:

Install R and RStudio. It will take 15 minutes.

5. ## Re: Distribution of Data

I was thinking that every row would correspond to the lowest level of data (i.e. each row would represent an individual leg of darts which would be a number between 0 and around 30. So there would be multiple entries for particular players because the have contributed more than one piece of data.

For each row there would also be the player ability variable.

Does that make sense?

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