TDIGEST.CDF

Syntax
TDIGEST.CDF key value [value ...]
Available in:
Redis Stack / Bloom 2.4.0
Time complexity:
O(1)

Returns, for each input value, an estimation of the fraction (floating-point) of (observations smaller than the given value + half the observations equal to the given value).

Multiple fractions can be retrieved in a signle call.

Required arguments

key is key name for an existing t-digest sketch.
value is value for which the CDF (Cumulative Distribution Function) should be retrieved.

Return value

Array reply - the command returns an array of floating-points populated with fraction_1, fraction_2, ..., fraction_N.

All values are 'nan' if the sketch is empty.

Examples

redis> TDIGEST.CREATE t COMPRESSION 1000
OK
redis> TDIGEST.ADD t 1 2 2 3 3 3 4 4 4 4 5 5 5 5 5
OK
redis> TDIGEST.CDF t 0 1 2 3 4 5 6
1) "0"
2) "0.033333333333333333"
3) "0.13333333333333333"
4) "0.29999999999999999"
5) "0.53333333333333333"
6) "0.83333333333333337"
7) "1"

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