annotate tests/test-summaries/expected/testplug-curve-vsr-variance.csv @ 303:523f8f1789b4

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# Sonic Annotator's summary method integrates the values across
# time. If an output lacks duration for its features, each feature is
# considered to extend until the timestamp of the following feature,
# and the final feature is considered to extend until the end of the
# input or the last-ending output, whichever is later.
#
# The curve-vsr output is therefore considered to have 9 values (0.0
# to 0.8) that span 0.75 seconds each, followed by one value (0.9)
# that spans the 3 seconds from 6.75 to 9.75 where the final output of
# the plugin ends (that's the notes-regions output).
#
# We can consider the last feature the same as four features of 0.75
# seconds each (i.e. the same durations as the first 9) each with the
# same value, 0.9.
#
# The mean m is then 7.2 / 13 = 0.553846 approx, and the variance is
# the sum for each of the 13 (partly fictitious) values v of (v-m)^2,
# divided by 13. This works out as 0.0994083 ish.
#
0.000000000,9.750000000,variance,0.0994083,"(variance, continuous-time average)"