fitlbc | R Documentation |
This function creates initial parameter estimates of the nonlinear Load
Bearing Capacity (Dias Jr., 1994) model, i.e., σ_P = 10 ^ {(b0 + b1 * θ)},
by using two methods: a getInitial method or a log-linearization. Then,
it uses them to provide its least-squares estimates via nls
.
fitlbc(theta, sigmaP, ...)
theta |
a numeric vector containing soil moisture values. |
sigmaP |
a numeric vector containing values of soil preconsolidation stress. |
... |
further arguments to |
A nls
object.
Anderson Rodrigo da Silva <anderson.agro@hotmail.com>
Dias Junior, M. S. (1994). Compression of three soils under longterm tillage and wheel traffic. 1994. 114p. Ph.D. Thesis - Michigan State University, East Lansing.
sigmaP
, fitbusscher
,
maxcurv
, Rsq
data(compaction) attach(compaction) out <- fitlbc(theta = Mois, sigmaP = PS) summary(out) Rsq(out) curve(10^(coef(out)[1] + coef(out)[2]*x)) # End (not run)
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