Generate composite score for apps

[shea256]

We should brainstorm about this but just posting this here to start the brainstorming.

Thinking we can have a composite score that we rank the apps by once we have multiple metrics.

Soon we'll have both weekly tweets and monthly page views.

One formula for this is as follows:

1. Create a ranking of all apps by weekly tweets, then give each app a percentile score P_t
2. Create a ranking of all apps by monthly page views, then give each app a percentile score P_p
3. Create a composite percentile score that averages P_t and P_p

[hstove]

Love it. Especially in combination with organic metrics like clicks and votes, we could put together a more authoritative score.

[markmhendrickson]

When we're done with https://github.com/blockstack/app.co/issues/42, we'll have the following data points for apps:

• Total visits per month
• Total page views per month
• Bounce rate per month
• Average time on site per month
• Tweets per week

We'll then be in the position to create an initial composite score re: this issue. My suggestion is that we apply the percentile scoring and averaging approach that @shea256 suggests using all of the above five factors except "Total page views per month" (since it's rather arbitrary and redundant with "Total visits per month").

This score should be recalculated on a daily basis using data from the past week / 7 days (to incorporate new tweets data) and from the past month (presumably calendar month, so the rest of the factors will only have an effect on the first day of every month).

The score should be used initially in two ways:

• To rank all apps for listing in category and platform sections / dedicated pages
• To replace the "Tweets/week" column with "App.co Score" that shows the value
• To show the score in the app profile itself (design forthcoming)

We can use the score to also detect when apps have moved up or down in popularity, but that usage should be saved for this separate issue: https://github.com/blockstack/app.co/issues/new

[hstove]

Here are my notes that I put together with more info about a composite ranking, and also a decentralization score that we've discussed at times: https://paper.dropbox.com/doc/App.co-Rankings--AJKueJmTsKQI0N6iip2qPyYLAg-EuMI5Sjy3VD0F7SpEfIdE