---
name: "t.vect.univar"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/t.vect.univar"
---

# t.vect.univar(1grass)

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

## NAME

**t.vect.univar**  - Calculates univariate statistics of attributes for each registered vector map of a space time vector dataset

## KEYWORDS

temporal, statistics, vector, time

## SYNOPSIS

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

### Flags:

- **-e**

  Calculate extended statistics

- **-u**

  Suppress printing of column names

- **--overwrite**

  Allow output files to overwrite existing files

- **--help**

  Print usage summary

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

- **--ui**

  Force launching GUI dialog

### Parameters:

- **input**=*name* **\[required\]**

  Name of the input space time vector dataset

- **output**=*name*

  Name for output file

- **layer**=*string*

  Layer number or name\
   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.\
   Default: *1*

- **column**=*name* **\[required\]**

  Name of attribute column

- **twhere**=*sql\_query*

  WHERE conditions of SQL statement without ’where’ keyword used in the temporal GIS framework\
   Example: start\_time \> ’2001-01-01 12:30:00’

- **where**=*sql\_query*

  WHERE conditions of SQL statement without ’where’ keyword\
   Example: income \< 1000 and population \>= 10000

- **type**=*string*

  Input feature type\
   Options: *point, line, boundary, centroid, area*\
   Default: *point*

- **separator**=*character*

  Field separator character between the output columns\
   Special characters: pipe, comma, space, tab, newline\
   Default: *pipe*

## 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 example; so create the **precip\_stations** space time vector dataset and after run the following command:\

```
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.info*

## AUTHOR

Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

## SOURCE CODE

Available at: t.vect.univar source code (history)

Accessed: Monday Feb 24 17:51:47 2025

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