# Stdev Script function Stdev() returns the standard deviation of the values given by the expression over a number of records as defined by a group by clause. Syntax: Stdev([distinct] expr) Return data type: numeric Arguments: Arguments | Argument | Description | | --- | --- | | expr | The expression or field containing the data to be measured. | | distinct | If the word distinct
occurs before the expression, all duplicates will be disregarded. | Examples and results: Add the example script to your applicationand run it. Then build a straight table with ` Type `and `MyStdev` as dimensions. Resulting data | Example | Result | | --- | --- | | ```
Table1:
Crosstable (Type, Value)
Load recno() as ID, * inline [
Observation\|Comparison
35\|2
40\|27
12\|38
15\|31
21\|1
14\|19
46\|1
10\|34
28\|3
48\|1
16\|2
30\|3
32\|2
48\|1
31\|2
22\|1
12\|3
39\|29
19\|37
25\|2 ] (delimiter is '\|');
```

`Stdev1:``LOAD Type,`` Stdev(Value) as MyStdev ``Resident Table1 Group By Type;` | The results of the Stdev() calculation are:

|