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lmfor

Functions for Forest Biometrics

Functions for different purposes related to forest biometrics, including illustrative graphics, numerical computation, modeling height-diameter relationships, prediction of tree volumes, modelling of diameter distributions and estimation off stand density using ITD. Several empirical datasets are also included.

Functions (34)

BrkRes

Breaking resistance (=bending strength) of birch wood samples

HDmodels

Available 2- and 3- parameter H-D model functions to be used by function fithd.

HTest

Estimate stand density using a Horvitz–Thompson-like estimator

HTest_cps

Estimate forest characteristics of interest in circular plot sampling using a Horvitz–Thompson-like estimator

ImputeHeights

Impute missing tree heights into a forest data using a nonlinear (mixed-effects) model.

Solve a Nonlinear Equation Using Newton-Raphson algorithm.

NRnum

Solve a Systems of Nonlinear Equations Using the Newton's Method

afterthin

Increment core data of Scots pine trees

alsTree

Individual tree characteristics and ALS data

circle

Plot circles of a specified radius

ddcomp

Evaluate the fit of a tree diameter distribution

fithd

Fit a Height-Diameter model to forest tree data using functions of package nlme.

foto

CO2 exchange of transplanted Sphagnum fuscum moss in a chronosequence of mires.

ips

Wood-decaying fungi carried by bark beetle individuals and their mites.

linesplot

A spaghetti plot of grouped data

lmfor-package

Functions of Lauri Mehtatalo

logit-logistic

The Four-parameter Logit-logistic Distribution

mywhiskers

A whiskers type residual plot

patti

Increment core data of Scots pine trees

percentile-based

The Percentile-based Distribution

plants

Sapling counts from sample plots of sapling stands in Finland.

plants2

Sapling counts from sample plots of sapling stands in Finland.

plot.hdmod

Diagnostic plot a Height-Diameter model residuals

predvol

Individual tree volume functions for Finland

qqplotHD

Normal QQ-plot of a fitted H-D model

qtree

Properties of sample quantiles from a tree population described by the percentile-based diameter distribution.

recweib

Recovery of Weibull parameters of tree diameter distribution using measured stand characteristics

scaleDMean

The Weibull scale parameter for the given mean/median diameter and shape parameter.

spati

Raw sample plot data of Scots pine in Ilomantsi, Finland.

spati2

Heights and diameters of Scots pine trees in Ilomantsi, Finland.

stumplift

Productivity of stump lifting machines.

thefdata

Effect of thinning on individual tree growth for 62 trees.

thinning

Effect of thinning on individual tree growth

updown

Solve a simple equation using a step halving algorithm.

lmfor

Functions for Forest Biometrics

v1.5

GPL-2

Authors

Lauri Mehtatalo and Kasper Kansanen

Initial release

2020-06-16

lmfor

Functions (34)

lmfor

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