sbp_basis {coda.base} R Documentation

## Isometric log-ratio basis based on Balances

### Description

Build an ilr_basis using a sequential binary partition or a generic coordinate system based on balances.

### Usage

sbp_basis(sbp, data = NULL, fill = FALSE, silent = FALSE)


### Arguments

 sbp parts to consider in the numerator and the denominator. Can be defined either using a list of formulas setting parts (see examples) or using a matrix where each column define a balance. Positive values are parts in the numerator, negative values are parts in the denominator, zeros are parts not used to build the balance. data composition from where name parts are extracted fill should the balances be completed to become an orthonormal basis? if the given balances are not orthonormal, the function will complete the balance to become a basis. silent inform about orthogonality

matrix

### Examples

X = data.frame(a=1:2, b=2:3, c=4:5, d=5:6, e=10:11, f=100:101, g=1:2)
sbp_basis(list(b1 = a~b+c+d+e+f+g,
b2 = b~c+d+e+f+g,
b3 = c~d+e+f+g,
b4 = d~e+f+g,
b5 = e~f+g,
b6 = f~g), data = X)
sbp_basis(list(b1 = a~b,
b2 = b1~c,
b3 = b2~d,
b4 = b3~e,
b5 = b4~f,
b6 = b5~g), data = X)
# A non-orthogonal basis can also be calculated.
sbp_basis(list(b1 = a+b+c~e+f+g,
b2 = d~a+b+c,
b3 = d~e+g,
b4 = a~e+b,
b5 = b~f,
b6 = c~g), data = X)


[Package coda.base version 0.5.5 Index]