# Sterr - script function
Sterr() returns the aggregated standard error (stdev/sqrt(n)) for a series of values represented by the expression iterated over a number of records as defined by a group by clause.
Syntax:
Sterr ([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. |
Limitations:
Text values, NULL values and missing values are disregarded.
Examples and results:
Add the example script to your app and run it. To see the result, add the fields listed in the results column to a sheet in your app.
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 '\|');
```
`Sterr1:``LOAD Type,`` Sterr(Value) as MySterr ``Resident Table1 Group By Type;` | In a table with the dimensions `Type` and `MySterr`, the results of the Sterr() calculation in the data load script are:
`Type MySterr`
`Comparison 3.2674431`
`Observation 2.7968733` |