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

# topic\_statistics(1grass)

## Topic: statistics

| | | |
| --- | --- | --- |
| d.correlate |  | Prints a graph of the correlation between raster maps (in pairs). |
| db.univar |  | Calculates univariate statistics on selected table column. |
| i.cca |  | Canonical components analysis (CCA) program for image processing. |
| r.clump |  | Recategorizes data in a raster map by grouping cells that form physically discrete areas into unique categories. |
| r.coin |  | Tabulates the mutual occurrence (coincidence) of categories for two raster map layers. |
| r.covar |  | Outputs a covariance/correlation matrix for user-specified raster map layer(s). |
| r.cross |  | Creates a cross product of the category values from multiple raster map layers. |
| r.kappa |  | Calculates error matrix and kappa parameter for accuracy assessment of classification result. |
| r.mode |  | Finds the mode of values in a cover map within areas assigned the same category value in a user-specified base map. |
| r.object.geometry |  | Calculates geometry parameters for raster objects. |
| r.quant |  | Produces the quantization file for a floating-point map. |
| r.reclass.area |  | Reclasses a raster map greater or less than user specified area size (in hectares). |
| r.regression.line |  | Calculates linear regression from two raster maps: y = a + b\*x. |
| r.regression.multi |  | Calculates multiple linear regression from raster maps. |
| r.report |  | Reports statistics for raster maps. |
| r.statistics |  | Calculates category or object oriented statistics. |
| r.stats |  | Generates area statistics for raster map. |
| r.stats.quantile |  | Compute category quantiles using two passes. |
| r.stats.zonal |  | Calculates category or object oriented statistics (accumulator-based statistics). |
| r.support.stats |  | Update raster map statistics |
| r.univar |  | Calculates univariate statistics from the non-null cells of a raster map. |
| r3.stats |  | Generates volume statistics for 3D raster maps. |
| r3.univar |  | Calculates univariate statistics from the non-null cells of a 3D raster map. |
| t.rast.univar |  | Calculates univariate statistics from the non-null cells for each registered raster map of a space time raster dataset. |
| t.rast3d.univar |  | Calculates univariate statistics from the non-null cells for each registered 3D raster map of a space time 3D raster dataset. |
| t.vect.univar |  | Calculates univariate statistics of attributes for each registered vector map of a space time vector dataset |
| v.db.univar |  | Calculates univariate statistics on selected table column for a GRASS vector map. |
| v.kcv |  | Randomly partition points into test/train sets. |
| v.normal |  | Tests for normality for vector points. |
| v.outlier |  | Removes outliers from vector point data. |
| v.qcount |  | Indices for quadrat counts of vector point lists. |
| v.rast.stats |  | Calculates univariate statistics from a raster map based on a vector map and uploads statistics to new attribute columns. |
| v.univar |  | Calculates univariate statistics of vector map features. |

*See also the corresponding keyword statistics for additional references.*

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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual