---
name: t.vect.univar
description: "Calculates univariate statistics of attributes for each registered vector map of a space time vector dataset"
keywords: [ temporal, statistics, vector, time ]
---

# t.vect.univar

Calculates univariate statistics of attributes for each registered vector map of a space time vector dataset

=== "Command line"

    **t.vect.univar**
    [**-eu**]
    **input**=*name*
    [**output**=*name*]
    [**layer**=*string*]
    **column**=*name*
    [**twhere**=*sql_query*]
    [**where**=*sql_query*]
    [**type**=*string*]
    [**separator**=*character*]
    [**--overwrite**]
    [**--verbose**]
    [**--quiet**]
    [**--qq**]
    [**--ui**]

    Example:

    ```sh
    t.vect.univar input=name column=name
    ```

=== "Python (grass.tools)"

    *grass.tools.Tools.t_vect_univar*(**input**,
        **output**=*None*,
        **layer**=*"1"*,
        **column**,
        **twhere**=*None*,
        **where**=*None*,
        **type**=*"point"*,
        **separator**=*"pipe"*,
        **flags**=*None*,
        **overwrite**=*None*,
        **verbose**=*None*,
        **quiet**=*None*,
        **superquiet**=*None*)

    Example:

    ```python
    tools = Tools()
    tools.t_vect_univar(input="name", column="name")
    ```

    This grass.tools API is experimental in version 8.5 and expected to be stable in version 8.6.

=== "Python (grass.script)"

    *grass.script.run_command*("***t.vect.univar***",
        **input**,
        **output**=*None*,
        **layer**=*"1"*,
        **column**,
        **twhere**=*None*,
        **where**=*None*,
        **type**=*"point"*,
        **separator**=*"pipe"*,
        **flags**=*None*,
        **overwrite**=*None*,
        **verbose**=*None*,
        **quiet**=*None*,
        **superquiet**=*None*)

    Example:

    ```python
    gs.run_command("t.vect.univar", input="name", column="name")
    ```

## Parameters

=== "Command line"

    **input**=*name* **[required]**  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of the input space time vector dataset  
    **output**=*name*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name for output file  
    **layer**=*string*  
    &nbsp;&nbsp;&nbsp;&nbsp;Layer number or name  
    &nbsp;&nbsp;&nbsp;&nbsp;Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *1*  
    **column**=*name* **[required]**  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of attribute column  
    **twhere**=*sql_query*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword used in the temporal GIS framework  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: start_time &gt; '2001-01-01 12:30:00'  
    **where**=*sql_query*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: income &lt; 1000 and population &gt;= 10000  
    **type**=*string*  
    &nbsp;&nbsp;&nbsp;&nbsp;Input feature type  
    &nbsp;&nbsp;&nbsp;&nbsp;Allowed values: *point, line, boundary, centroid, area*  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *point*  
    **separator**=*character*  
    &nbsp;&nbsp;&nbsp;&nbsp;Field separator character between the output columns  
    &nbsp;&nbsp;&nbsp;&nbsp;Special characters: pipe, comma, space, tab, newline  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *pipe*  
    **-e**  
    &nbsp;&nbsp;&nbsp;&nbsp;Calculate extended statistics  
    **-u**  
    &nbsp;&nbsp;&nbsp;&nbsp;Suppress printing of column names  
    **--overwrite**  
    &nbsp;&nbsp;&nbsp;&nbsp;Allow output files to overwrite existing files  
    **--help**  
    &nbsp;&nbsp;&nbsp;&nbsp;Print usage summary  
    **--verbose**  
    &nbsp;&nbsp;&nbsp;&nbsp;Verbose module output  
    **--quiet**  
    &nbsp;&nbsp;&nbsp;&nbsp;Quiet module output  
    **--qq**  
    &nbsp;&nbsp;&nbsp;&nbsp;Very quiet module output  
    **--ui**  
    &nbsp;&nbsp;&nbsp;&nbsp;Force launching GUI dialog

=== "Python (grass.tools)"

    **input** : str, *required*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of the input space time vector dataset  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, stvds, *name*  
    **output** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name for output file  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: output, file, *name*  
    **layer** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Layer number or name  
    &nbsp;&nbsp;&nbsp;&nbsp;Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, layer  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *1*  
    **column** : str, *required*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of attribute column  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, dbcolumn, *name*  
    **twhere** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword used in the temporal GIS framework  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: start_time &gt; '2001-01-01 12:30:00'  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: *sql_query*  
    **where** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: income &lt; 1000 and population &gt;= 10000  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, sql_query, *sql_query*  
    **type** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Input feature type  
    &nbsp;&nbsp;&nbsp;&nbsp;Allowed values: *point, line, boundary, centroid, area*  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *point*  
    **separator** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Field separator character between the output columns  
    &nbsp;&nbsp;&nbsp;&nbsp;Special characters: pipe, comma, space, tab, newline  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, separator, *character*  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *pipe*  
    **flags** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Allowed values: *e*, *u*  
    &nbsp;&nbsp;&nbsp;&nbsp;**e**  
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Calculate extended statistics  
    &nbsp;&nbsp;&nbsp;&nbsp;**u**  
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Suppress printing of column names  
    **overwrite** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Allow output files to overwrite existing files  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **verbose** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Verbose module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **quiet** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Quiet module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **superquiet** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Very quiet module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  

    Returns:

    **result** : grass.tools.support.ToolResult | None  
    If the tool produces text as standard output, a *ToolResult* object will be returned. Otherwise, `None` will be returned.

    Raises:

    *grass.tools.ToolError*: When the tool ended with an error.

=== "Python (grass.script)"

    **input** : str, *required*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of the input space time vector dataset  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, stvds, *name*  
    **output** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name for output file  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: output, file, *name*  
    **layer** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Layer number or name  
    &nbsp;&nbsp;&nbsp;&nbsp;Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, layer  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *1*  
    **column** : str, *required*  
    &nbsp;&nbsp;&nbsp;&nbsp;Name of attribute column  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, dbcolumn, *name*  
    **twhere** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword used in the temporal GIS framework  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: start_time &gt; '2001-01-01 12:30:00'  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: *sql_query*  
    **where** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;WHERE conditions of SQL statement without 'where' keyword  
    &nbsp;&nbsp;&nbsp;&nbsp;Example: income &lt; 1000 and population &gt;= 10000  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, sql_query, *sql_query*  
    **type** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Input feature type  
    &nbsp;&nbsp;&nbsp;&nbsp;Allowed values: *point, line, boundary, centroid, area*  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *point*  
    **separator** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Field separator character between the output columns  
    &nbsp;&nbsp;&nbsp;&nbsp;Special characters: pipe, comma, space, tab, newline  
    &nbsp;&nbsp;&nbsp;&nbsp;Used as: input, separator, *character*  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *pipe*  
    **flags** : str, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Allowed values: *e*, *u*  
    &nbsp;&nbsp;&nbsp;&nbsp;**e**  
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Calculate extended statistics  
    &nbsp;&nbsp;&nbsp;&nbsp;**u**  
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Suppress printing of column names  
    **overwrite** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Allow output files to overwrite existing files  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **verbose** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Verbose module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **quiet** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Quiet module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*  
    **superquiet** : bool, *optional*  
    &nbsp;&nbsp;&nbsp;&nbsp;Very quiet module output  
    &nbsp;&nbsp;&nbsp;&nbsp;Default: *None*

## DESCRIPTION

The module *t.vect.univar* computes univariate statistics of a space
time vector dataset based on a single attribute row.

## EXAMPLE

The example is based on the
[t.vect.observe.strds](t.vect.observe.strds.md) example; so create the
**precip_stations** space time vector dataset and after run the
following command:

```sh
t.vect.univar input=precip_stations col=month
id|start|end|n|nmissing|nnull|min|max|range|mean|mean_abs|population_stddev|population_variance|population_coeff_variation|sample_stddev|sample_variance|kurtosis|skewness
precip_stations_monthly@climate_2009_2012|2009-01-01 00:00:00|2009-02-01 00:00:00|132|0|4|-2.31832|7.27494|9.59326|3.44624|3.5316|1.79322|3.21564|0.520341|1.80005|3.24019|0.484515|-0.338519
precip_stations_monthly@climate_2009_2012|2009-02-01 00:00:00|2009-03-01 00:00:00|132|0|4|-0.654152|7.90613|8.56028|5.47853|5.48844|1.73697|3.01708|0.317051|1.74359|3.04011|0.875252|-1.0632
....
precip_stations_monthly@climate_2009_2012|2012-10-01 00:00:00|2012-11-01 00:00:00|132|0|4|9.67596|18.4654|8.78945|14.945|14.945|1.90659|3.6351|0.127574|1.91386|3.66285|-0.0848967|-0.700833
precip_stations_monthly@climate_2009_2012|2012-11-01 00:00:00|2012-12-01 00:00:00|132|0|4|3.56755|10.6211|7.05357|7.72153|7.72153|1.33684|1.78715|0.173132|1.34194|1.8008|0.90434|-0.863935
precip_stations_monthly@climate_2009_2012|2012-12-01 00:00:00|2013-01-01 00:00:00|132|0|4|3.04325|11.6368|8.5935|8.20147|8.20147|1.78122|3.17275|0.217183|1.78801|3.19697|-0.177991|-0.501295
```

## SEE ALSO

*[t.create](t.create.md), [t.info](t.info.md)*

## AUTHOR

Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

## SOURCE CODE

Available at: [t.vect.univar source code](https://github.com/OSGeo/grass/tree/main/temporal/t.vect.univar)
([history](https://github.com/OSGeo/grass/commits/main/temporal/t.vect.univar))  
Latest change: Friday Feb 07 19:16:09 2025 in commit [a82a39f](https://github.com/OSGeo/grass/commit/a82a39f673b97fafcfce1604dc3e6015cb96487a)
