# TDIGEST.MIN












Returns the minimum observation value from a t-digest sketch.

## Required arguments

<details open><summary><code>key</code></summary>

is the key name for an existing t-digest sketch.
</details>

## Examples


redis> TDIGEST.CREATE t
OK
redis> TDIGEST.MIN t
"nan"
redis> TDIGEST.ADD t 3 4 1 2 5
OK
redis> TDIGEST.MIN t
"1"


## Return information

{{< multitabs id=“tdigest-min-return-info" 
    tab1="RESP2" 
    tab2="RESP3" >}}

One of the following:

* [Bulk string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#bulk-strings) as floating-point representing the minimum observation value from the given sketch. The result is always accurate. `nan` is returned if the sketch is empty.
* [Simple string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-strings) in these cases: incorrect number of arguments or incorrect key type.

-tab-sep-

One of the following:

* [Double reply](https://redis.io/docs/latest/develop/reference/protocol-spec#doubles) representing the minimum observation value from the given sketch. The result is always accurate. `nan` is returned if the sketch is empty.
* [Simple string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-strings) in these cases: incorrect number of arguments or incorrect key type.