yyHatPlot {expandFunctions}

Plot y and yHat on the same scale w/reference line

Description

Plots y and yHat on the same scale as a scatterplot with a 1:1 reference line in red. This is useful for visually comparing actual data y with estimates yHat, determining outliers, etc.

Usage

yyHatPlot(y, yHat, ...)

Arguments

y

Vector or matrix coercible to vector. Typically will be the quantity to be predicted.

yHat

Vector or matrix coercible to vector, same length as y. Typically will be the prediction.

...

Optional additional graph parameters.

Details

Normally only makes sense with vectors, column matrices, or row matrices.

Value

Returns invisibly - only used for graphic side effects.

Examples

set.seed(1)
nObs <- 80
X <- distMat(nObs,2)
A <- cbind(c(1,-1))
Y <- X %*% A + rnorm(nObs) # Response data
lmObj <- lm(Y ~ X)
Yhat <- predict(lmObj) # Estimated response
yyHatPlot(Y,Yhat)