biotools (version 1.0)

pathanalysis: Path Analysis, Simple and Under Colinearity

Description

Function to perform the simple path analysis and the path analysis under colinearity. It computes the direct (diagonal) and indirect (off-diagonal) effects of each explanatory variable over a response one.

Usage

pathanalysis(corMatrix, resp.col, colinearity = FALSE)

Arguments

corMatrix

a correlation matrix.

resp.col

an integer value indicating the column in corMatrix that corresponds to the response variable.

colinearity

logical; if TRUE, an external interactive display is used to pass a value, say k, at which to evaluate the system: (X'X + Ik)B = X'Y, being X'X the correlation matrix between explanatory variables, X'Y the c

Value

• A list of
• coef
  a matrix containing the direct (diagonal) and indirect (off-diagonal) effects of each variable.
• Rsq
  the coefficient of determination.
• ResidualEffect
  the residual effect.
• VIF
  a vector containing the variance inflation factors; only if colinearity is FALSE.
• CN
  the condition number; only if colinearity is FALSE.

References

Carvalho, S.P. (1995) Metodos alternativos de estimacao de coeficientes de trilha e indices de selecao, sob multicolinearidade. Ph.D. Thesis, Federal University of Vicosa (UFV), Vicosa, MG, Brazil.

Examples

data(peppercorr)
pathanalysis(peppercorr, 6, colinearity = TRUE)

# End (not run)