WSV_BARegression: Create regression equation to link whole stem volume and...

Description Usage Arguments Value Author(s)

Description

This function develops regression equations between whole stem volume (WSV) and basal area (BA) for both alive and dead trees. The equation is derived at project group and species level. When sample size is small or the model's performance is poor for a given species, the species type, i.e., deciduous or coniferious species, is used as this species in developing the model. The function is equivalent to reg_wsv_2017.sas. To estimate tree volume for non-enhanced trees, the resultant equations will be used.

Usage

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WSV_BARegression(regressionData, minObs, minR2)

## S4 method for signature 'data.table,numeric,numeric'
WSV_BARegression(regressionData, minObs,
  minR2)

## S4 method for signature 'data.table,missing,numeric'
WSV_BARegression(regressionData, minR2)

## S4 method for signature 'data.table,numeric,missing'
WSV_BARegression(regressionData, minObs)

## S4 method for signature 'data.table,missing,missing'
WSV_BARegression(regressionData)

Arguments

regressionData

numeric, Specifies whole stem volume.

minObs

numeric, Defines the minimum number of observations (included) that used for the regression. If missing, 3 is used to be consistent with the compilation manual.

minR2

numeric, Defines the minimum R square to identify the models goodness of fit. If missing, 0.3 is used.

Value

A data table that contains key statistics of whole stem volume and basal area regression.

Author(s)

Yong Luo


bcgov/BCForestInventory documentation built on Feb. 11, 2018, 4:17 p.m.