TDIGEST.TRIMMED_MEAN

Syntax

TDIGEST.TRIMMED_MEAN key low_cut_quantile high_cut_quantile

Available in:: Redis Stack / Bloom 2.4.0
Time complexity:: O(N) where N is the number of centroids

Returns an estimation of the mean value from the sketch, excluding observation values outside the low and high cutoff quantiles.

Required arguments

key

is key name for an existing t-digest sketch.

low_cut_quantile

Foating-point value in the range [0..1], should be lower than high_cut_quantile

When equal to 0: No low cut.

When higher than 0: Exclude observation values lower than this quantile.

high_cut_quantile

Floating-point value in the range [0..1], should be higher than low_cut_quantile

When lower than 1: Exclude observation values higher than or equal to this quantile.

When equal to 1: No high cut.

Return value

Simple string reply estimation of the mean value. 'nan' if the sketch is empty.

Examples

redis> TDIGEST.CREATE t COMPRESSION 1000
OK
redis> TDIGEST.ADD t 1 2 3 4 5 6 7 8 9 10
OK
redis> TDIGEST.TRIMMED_MEAN t 0.1 0.6
"4"
redis> TDIGEST.TRIMMED_MEAN t 0.3 0.9
"6.5"
redis> TDIGEST.TRIMMED_MEAN t 0 1
"5.5"