Replacer functions {BLCOP}

Various functions for modifying fields of view objects

Description

These functions allow for direct replacement of fields of view objects such as the pick matrix and vector of confidences.

Usage

PMatrix(views) <- value
confidences(views) <- value
qv(views) <- value

Arguments

views

An object of class BLViews or COPViews, except in the case of qv<- which applies only to BLViews

value

A vector in confidences<- and qv<- or a matrix in PMatrix<-.

Value

The object is modified directly

Author(s)

Francisco Gochez <[e-mail]>

Examples

## example from Thomas M. Idzorek's paper "A STEP-BY-STEP GUIDE TO THE BLACK-LITTERMAN MODEL"
x <- c(0.001005,0.001328,-0.000579,-0.000675,0.000121,0.000128,-0.000445,-0.000437 ,
     0.001328,0.007277,-0.001307,-0.000610,-0.002237,-0.000989,0.001442,-0.001535 ,
     -0.000579,-0.001307,0.059852,0.027588,0.063497,0.023036,0.032967,0.048039 ,
    -0.000675,-0.000610,0.027588,0.029609,0.026572,0.021465,0.020697,0.029854 ,
     0.000121,-0.002237,0.063497,0.026572,0.102488,0.042744,0.039943,0.065994 ,
     0.000128,-0.000989,0.023036,0.021465,0.042744,0.032056,0.019881,0.032235 ,
    -0.000445,0.001442,0.032967,0.020697,0.039943,0.019881,0.028355,0.035064 ,
    -0.000437,-0.001535,0.048039,0.029854,0.065994,0.032235,0.035064,0.079958 )

    varCov <- matrix(x, ncol = 8, nrow = 8)
    mu <- c(0.08, 0.67,6.41, 4.08, 7.43, 3.70, 4.80, 6.60) / 100
    pick <- matrix(0, ncol = 8, nrow = 3, dimnames = list(NULL, letters[1:8]))
    pick[1,7] <- 1
    pick[2,1] <- -1; pick[2,2] <- 1
    pick[3, 3:6] <- c(0.9, -0.9, .1, -.1)
    confidences <- 1 / c(0.000709, 0.000141, 0.000866)
    myViews <- BLViews(pick, c(0.0525, 0.0025, 0.02), confidences, letters[1:8])
    myPosterior <- posteriorEst(myViews, tau = 0.025, mu, varCov )
    myPosterior
    # increase confidences
   	confidences(myViews) <-  1 / c(0.0001, 0.0001, 0.0005)
    myPosterior2 <- posteriorEst(myViews, tau = 0.025, mu, varCov )
    myPosterior2