Description Usage Format Source Examples
Soil chemistry properties measured on a regular grid with 10 x 25 points spaced by 5 meters.
COORD.X
- X coordinate.
COORD.Y
- Y coordinate.
SAND
- Sand portion of the sample.
SILT
- Silt portion of the sample.
CLAY
- Clay portion of the sample.
PHWATER
- Soil pH at water.
CA
- Calcium content.
MG
- Magnesium content.
K
- Potassio content.
1 |
a data.frame
with 250 records and 9 variables.
Bonat, W. H. (2018). Multiple Response Variables Regression Models in R: The mcglm Package. Journal of Statistical Software, 84(4):1–30.
1 2 3 4 5 6 7 8 9 10 11 12 13 | data(soil, package="mcglm")
## neigh <- spdep::tri2nb(soil[,1:2])
## Spatial model
## Z1 <- mc_car(neigh) take too long
Z1 <- mc_id(soil)
# Linear predictor
form.ca <- CA ~ COORD.X*COORD.Y + SAND + SILT + CLAY + PHWATER
fit.ca <- mcglm(linear_pred = c(form.ca), matrix_pred = list(Z1),
link = "log", variance = "tweedie", covariance = "inverse",
power_fixed = TRUE, data = soil,
control_algorith = list(max_iter = 1000, tuning = 0.1,
verbose = FALSE, tol = 1e-03))
## mc_compute_rho(fit.ca) only for spatial model
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