topic_statistics(1grass)

✨ topic_statistics(1grass) — GRASS User's Manual ✨

okay bestie, so this is the GRASS User's Manual page for the topic statistics 🫶 it is literally a whole group chat of modules that all care about numbers, distributions, error matrices and quantiles. no cap. scroll at your own pace, hydrate, and remember: every tool here lives under the same topic keyword so you can find them all again later. 💅

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🎀 Topic: statistics

here's the full roster, alphabetical because GRASS is a Virgo 💖

• d.correlate — prints you a whole graph of the correlation between raster maps (and yes, it does them in pairs).
• db.univar — does univariate statistics on a table column you picked out. just the one column, she's focused.
• i.cca — Canonical components analysis (CCA) program, but make it image processing. 🌈
• r.clump — recategorizes data in a raster map by grouping cells that form physically discrete areas into unique categories. so like, clumping the little disconnected islands into their own lil IDs 🦋
• r.coin — tabulates the mutual occurrence (coincidence) of categories for two raster map layers. two layers, one table, iconic.
• r.covar — outputs a covariance/correlation matrix for the raster map layer(s) you specify.
• r.cross — creates a cross product of the category values from multiple raster map layers. carry the one ✨
• r.kappa — calculates the error matrix and kappa parameter for accuracy assessment of a classification result. your vibe check, numerically 🌸
• 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. shape lore 💀
• r.quant — produces the quantization file for a floating-point map.
• r.reclass.area — reclasses a raster map greater or less than a user specified area size (in hectares). big units, honestly.
• r.regression.line — calculates linear regression from two raster maps: y = a + b*x. math class but cute.
• 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 — computes category quantiles using two passes. two passes, no shortcuts 😌
• r.stats.zonal — calculates category or object oriented statistics (accumulator-based statistics).
• r.support.stats — updates raster map statistics.
• r.univar — calculates univariate statistics from the non-null cells of a raster map. non-null ONLY, we don't count the nothings 🙈
• 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. time series girlies rise 👑
• 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 partitions points into test/train sets. it's giving train/test split era 💜
• v.normal — tests for normality for vector points. are you normal? be honest 🍓
• v.outlier — removes outliers from vector point data. bye girl, you're not like the others 🎀
• 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. uploads!! it's posting 📤
• v.univar — calculates univariate statistics of vector map features.

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🔗 SEE ALSO

see also the corresponding keyword statistics for additional references. go down that rabbit hole, iygwkwyk 💅

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🌈 Indexes

• Main index
• Topics index
• Keywords index
• Graphical index
• Full index

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reminder bestie: this whole topic is just a pass-through list — the real magic lives in each module's own manual page. click through and read the options before you run anything real. 🫶

okay that's the page!! 💖 official sign-off time: this is the GRASS 8.5.0 Reference Manual, © 2003-2026 GRASS Development Team, and yeah the footer says GRASS 8.5.0 on the left and topic_statistics(1grass) on the right, exactly like it should. slay, stay statistical, and may all your cells be non-null. ✨👑⭐