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+#statistics
+
+---
+Also known as; rolling-average, running-average, moving-mean, running-mean, rolling-mean.
+
+Has three variations: simple, weighted, cumulative.
+
+A type of [[convolution]].
+
+Reduces noisiness in a time-series graph which makes long-term trends or cycles more easily visible.
+
+Keeps averaging a subset of given set and move the subset one space to the right.
+Example with sample-size of 3:
+```
+set: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+i=1: avg([0, 1, 2]) = 1
+i=2: avg([1, 2, 3]) = 2
+i=3: avg([2, 3, 4]) = 3
+...
+```