# Calulate probability of points allocation

1. Apr 16, 2012

### Sephiroth100

Hi,

First time posting so be gentle :)

I have a website and on the website I calculate popularity of objects over time.

One of the objects is called 'Store Category' - a store has one or more categories.

I.e. the store Easyjet, has categories 'Flights', 'Hotels' etc.

In order to apply popularity at this level the visitor must have first chosen a category. This is not always the case, because I might present a list of stores and the visitor selects one directly, without narrowing the stores by category first.

When this happens I'm left with a pot of popularity points where the category could not be identified. I would like to try and allocate the points using some kind of algorithm.

So, take our example of Easyjet

Easyjet operates in 3 categories, 'Flights', 'Hotels' and 'Travel Insurance'.

Each category is operational for x days and has accrued x identifiable points.

Flights - 90 days, 180pts
Hotels - 30 days, 60pts
Travel Insurance - 60 days, 0pts​

I have 180pts in the pot that are yet to be allocated across the 3 categories, but what's a fair assumption?

My first thoughts were a combination using time and points independently because otherwise categories with no points would never get allocated points from the pot.

points to allocate = pot points * (days/total days + pts/total pts / 2)
using Flights: 105 = 180 * ((90/180 + 180/270) / 2)​

But I'm no mathematician so any help would be appreciated.

Thanks

John

Last edited: Apr 16, 2012