diff --git a/faq.html b/faq.html
index 979e47a84..b322dc6f1 100644
--- a/faq.html
+++ b/faq.html
@@ -84,6 +84,36 @@
becomes selected, tap the overflow icon on the menu bar (it looks like three
vertical dots), then select delete.
+ How is the score calculated?
+
+ To compute the score of a habit, the app uses the statistical method known as
+ exponential smoothing. Basically, it computes a weighted average that takes
+ into consideration every single repetition of the habit, from the very first
+ you started your habit until today. Recent repetitions are considered more
+ important than old ones, and have a larger impact on the score. This method has
+ many nice properties, including:
+
+
+ - Every repetition counts, even way back in the past. This is not true for
+ other simpler formulas, such as counting how many times have you performed
+ the habit in the last week/month/year and then dividing by the number of
+ days in that interval.
+ - If you have a poor habit score, then a few repetitions can bring your score
+ up very quickly. As your score improves, however, the reward for each
+ repetition gets smaller and smaller, so you have to keep at it if you want
+ to see any increase.
+ - If you have a high score for a very long time and you take a short break,
+ it's quite easy to restore your score back to what it was. If you start
+ taking frequent breaks, however, then your score will suffer.
+
+
+ The precise parameters on the formula were tweaked so that, if you perform a
+ new daily habit perfectly, the score reaches 80% after one month, 96% after two
+ months and 99% after three months. For non-daily habits, it takes longer to
+ reach the same percentages. If your habit is repeated every other day, for example,
+ then it takes two months to reach 80%, and if you habit is weekly, then it
+ takes seven months.
+
Importing and exporting data
If I uninstall the app, will I lose all my data?
@@ -240,7 +270,7 @@
sass
Last update:
- 2016-07-27
+ 2016-09-19