plot_radar: Radar / Spider Chart of Variable Scores

In SQIpro: Comprehensive Soil Quality Index Computation and Visualization

Radar / Spider Chart of Variable Scores

Description

Draws a radar (spider) chart comparing mean variable scores across groups. Useful for visualising the multidimensional soil quality profile of each land-use system.

Usage

plot_radar(
  scored,
  config,
  group_col,
  group_cols = group_col,
  vars = NULL,
  title = "Soil Quality Radar Profile",
  palette = c("#1b7837", "#762a83", "#d6604d", "#4393c3", "#f4a582")
)

Arguments

scored	A scored data frame from score_all.
config	A sqi_config object.
group_col	Character. Column used to define radar chart series.
group_cols	Character vector of all grouping columns.
vars	Character vector of variables to include. Defaults to all in config.
title	Character. Plot title.
palette	Character vector of colours for each group.

Value

Invisible NULL; the chart is rendered to the active graphics device.

References

Chambers, J.M., & Hastie, T.J. (1992). Statistical Models in S. Wadsworth & Brooks/Cole.

Examples

data(soil_data)
cfg <- make_config(
  variable = c("pH","EC","BD","OC","MBC","Clay"),
  type     = c("opt","less","less","more","more","opt"),
  opt_low  = c(6.0, NA, NA, NA, NA, 20),
  opt_high = c(7.0, NA, NA, NA, NA, 35)
)
scored <- score_all(soil_data, cfg, group_cols = c("LandUse","Depth"))
plot_radar(scored, cfg, group_col = "LandUse",
           group_cols = c("LandUse","Depth"))

SQIpro documentation built on April 20, 2026, 5:06 p.m.