SK_VOLab_EBLUP_LME.f: taper volume estimation

In TapeR: Flexible Tree Taper Curves Based on Semiparametric Mixed Models

taper volume estimation

Description

Internal function not usually called by users

Usage

SK_VOLab_EBLUP_LME.f(
  xm,
  ym,
  a = 0,
  b = 1,
  Ht,
  par.lme,
  Rfn = list(fn = "sig2"),
  IntPolOpt = TRUE,
  ...
)

Arguments

xm	relative heights for which measurements are available
ym	corresponding diameter measurements in height xm
a	relative height of lower threshold of stem section
b	relative height of upper threshold of stem section
Ht	tree height
par.lme	List of taper model parameters obtained by TapeR_FIT_LME.f
Rfn	list with function name to provide estimated or assumed residual variances for the given measurements, optionally parameters for such functions
IntPolOpt	option for method of interpolation, if TRUE using a natural interpolating spline (splinefun), if FALSE using a smoothing spline (smooth.spline); defaults to TRUE
...	not currently used

Details

with Rfn=list(fn="zero") one can decide whether the measured diameters are forced to lie exactly on the taper curve; this interferes somewhat with the IntPolOpt, which determines the method of taper curve point interpolation for integration. The default TRUE (used throughout all function calls) applies natural interpolating splines, hence this does not contradict the optional use of Rfn=list(fn="zero").

Value

List with two elements, the estimated volume and its variance

Author(s)

Edgar Kublin

TapeR documentation built on Aug. 16, 2023, 9:07 a.m.