QE: Body Mass Estimates Using Combined Humeral and Femoral...
In MASSTIMATE: Body Mass Estimation Equations for Vertebrates

Description Usage Arguments Details Value Author(s) References See Also Examples

This function is based on the bivariate regression equations from Campione and Evans (2012) for esimating body mass in terretrial vertebartes using the combined humeral and femoral circumferences

1 2	QE(HFC = NULL, HC, FC, equation = "raw", quadratic = FALSE, data = NULL, return_PI = FALSE)

`HFC`	a value or vector representing the combined humeral and femoral circumferences
`HC`	a value or vector representing humeral circumference (in mm)
`FC`	a value or vector representing femoral circumference (in mm)
`equation`	desired estimation equation. Two possible choices (See Details)
`quadratic`	a logical indicating whether estimates based on the quadratic equation should be used (See Details)
`data`	an optional object of `class = "data.frame"` or `class = "matrix"`
`return_PI`	an optional logical value to also provide the wider prediction intervals on the estimate, currenly only works if `equation = "raw"`

The function includes two different equations. equation = "raw" (default) applies the non-phylogenetically corrected regression equation - equation 1 of Campione and Evans (2012). equation = "phylocor" applies the phylogenetically corrected regression equation - equation 2 of Campione and Evans (2012).

If HFC is specified, then HC and FC are ignored.

If quadratic = TRUE, then a second set of estimates will be returned based on a quadratic view of the Campione and Evans (2012) data set (Campione, 2017).

If a data object is specified, the mass estiamtes and additional results will be added as columns to the data.frame or matrix within that object.

Eight numeric values or columns are returned if quadratic = TRUE (identified by q):

`log.QE`	A numeric value or vector representing the mass estimate(s) in log10 grams
`QE`	A numeric value or vector representing the mass estimate(s) in grams
`lower.QE`	A numeric value or vector representing the lower prediction error derived for the specific equation by Campione and Evans (2012)
`upper.QE`	A numeric value or vector representing the upper prediction error
`log.qQE`	A numeric value or vector representing the mass estimate(s) in log10 grams using a quadratic equation
`qQE`	A numeric value or vector representing the mass estimate(s) in grams
`lower.qQE`	A numeric value or vector representing the lower prediction error derived for the specific equation by Campione (2017)
`upper.qQE`	A numeric value or vector representing the upper prediction error

Nicolas E. Campione

Campione, N. E. and Evans, D. C. (2012) A universal scaling relationship between body mass and proximal limb bone dimensions in quadrupedal terrestrial tetrapods. BMC Biology, 10, 60.

Campione, N. E. (2017) Extrapolation of a universal scaling relationship for estimating body masses in extinct terrestrial vertebrates. Paleobiology, 43 (4), 693-699.

cQE quadrupeds MR AHR1985 MCF2004

##Dinosaur data from Campione and Evans (2012) for quadrupedal dinosaurs
data(dinos)

##Combined equation based on the raw regression
QE(HC = dinos$HC, FC = dinos$FC, quadratic = TRUE, data = dinos, return_PI = TRUE)

##Combined equation based on the phylogenetically corrected regression, data not specified
QE(HC = dinos$HC, FC = dinos$FC, equation = "phylocor")