Description Usage Arguments Details Value See Also
xxx
1 2 | relCurvature(s.sqr, R11, R2, show.extra.details=FALSE,
eps=sqrt(.Machine$double.eps))
|
s.sqr |
sample estimate of the residual variance. |
R11 |
submatrix of R. See details. |
R2 |
submatrix of R. See details. |
show.extra.details |
logical indicating if extra intermediate calculations should be printed. |
eps |
singular values smaller than eps times the largest singular value are considered to be zero. |
The result is the relative curvature array Bates & Watts p242-244 eqn. (7.16) and examples p244-245.
R11 is a p by p sub matrix of R. See Bates & Watts p236 and R2 is the m by pp sub matrix R12 R22 ... If I-B is not positive definite, where B is the effective residual curvature matrix, and warn is TRUE, then a warning will indicate that the calculation does not seem to correspond to a local minimum.
relative curvature array
curvature
project
effectiveCurvature
curvatureStats
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