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title: Top Packages Algorithm
## Score
## Package Score
A package's score is currently equal to a pseudo rolling average of downloads,
plus the sum of review scores.
Each package is given a `score`, which is used when ordering them in the
"Top Games/Mods/Texture Packs" lists. The intention of this feature is
to make it easier for new users to find good packages.
A package's score is equal to a rolling average of recent downloads,
plus the sum of the score given by reviews.
A review score is 100 if positive, -100 if negative.
score = avg_downloads + Σ 100 * (positive ? 1 : -1)
reviews_sum = sum(100 * (positive ? 1 : -1))
score = avg_downloads + reviews_sum
## Pseudo rolling average of downloads
Every package loses 5% of its score every day, and will gain 1 score for each
unique download.
Each package adds 1 to `avg_downloads` for each unique download,
and then loses 5% (=1/20) of the value every day.
This metric aims to be roughly equivalent to the average downloads.
This is called a [Frecency](https://en.wikipedia.org/wiki/Frecency) heuristic,
a measure which combines both frequency and recency.
## Seeded using a legacy heuristic
The scoring system was seeded (ie: the scores were initially set to) 20% of an
arbitrary legacy heuristic that was previously used to rank packages.
This legacy heuristic is as follows:
forum_score = views / max(years_since_creation, 2 weeks) + 80*clamp(months, 0.5, 6)
forum_bonus = views + posts
multiplier = 1
if no screenshot:
multiplier *= 0.8
score = multiplier * (max(downloads, forum_score * 0.6) + forum_bonus)
As said, this legacy score is no longer used when ranking mods.
It was only used to provide an initial score for the rolling average,
which was 20% of the above value.
## Manual adjustments
The admin occasionally reduces all packages by a set percentage to speed up
convergence. Convergence is when the pseudo-rolling average matches the actual
rolling average - the effect of the legacy heuristic is gone.
"Unique download" is counted per IP per package.
Downloading an update won't increase the download count if it's already been
downloaded from that IP.
## Transparency and Feedback