amod | R Documentation |
Allometric models and parameters are used to scale organic growth.
amod(x, mp = c(1, 1), fun = y ~ a * (x^b))
x |
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mp |
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fun |
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. Allometric models are useful to
scale size-components of organisms such as
tree diameters (mp = c(2,1)
) and
basal areas (mp = c(0.25 *
pi,2)
). Several parameter groups
(c(a1,b1,a2,b2, ..., an,bn)
) can be
recursively processed. This enables
computation of complex organic
variables. For example, above-ground tree
biomass could be computed from two
parameter groups for tree-biomass, and
over-bark diameter scaling.
data.frame
of the scaled variable (x) and relative
increments (csx). These are computed with setdiff
function.
Wilson Lara <wilarhen@gmail.com>, Felipe Bravo <fbravo@pvs.uva.es>
## Simulating TRW records: set.seed(1) trw <- ts(abs(rnorm(12,1,1)),start = 1950) ## Cumulative TRW: cri <- cumsum(trw) ## tree diameters td <- amod(cri,mp = c(2,1)) ## plot of the tree diameters and the ## relative increments: plot(ts(td))
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