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#
# Copyright 2007-2019 by the individuals mentioned in the source code history
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Program: MultipleRegression_PathCov.R
# Author: Ryne Estabrook
# Date: 2009.08.01
#
# ModelType: Regression
# DataType: Continuous
# Field: None
#
# Purpose:
# Multiple Regression model to estimate effect of
# independent on dependent variables
# Path style model input - Covariance matrix data input
#
# RevisionHistory:
# Hermine Maes -- 2009.10.08 updated & reformatted
# Ross Gore -- 2011.06.15 added Model, Data and Field metadata
# Hermine Maes -- 2014.11.02 piecewise specification
# -----------------------------------------------------------------------------
require(OpenMx)
# Load Library
# -----------------------------------------------------------------------------
myRegDataCov <- matrix(
c(0.808,-0.110, 0.089, 0.361,
-0.110, 1.116, 0.539, 0.289,
0.089, 0.539, 0.933, 0.312,
0.361, 0.289, 0.312, 0.836),
nrow=4,
dimnames=list(
c("w","x","y","z"),
c("w","x","y","z"))
)
myRegDataMeans <- c(2.582, 0.054, 2.574, 4.061)
names(myRegDataMeans) <- c("w","x","y","z")
MultipleDataCov <- myRegDataCov[c("x","y","z"),c("x","y","z")]
MultipleDataMeans <- myRegDataMeans[c(2,3,4)]
# Prepare Data
# -----------------------------------------------------------------------------
# dataset
dataCov <- mxData( observed=MultipleDataCov, type="cov", numObs=100,
means=MultipleDataMeans )
# variance paths
varPaths <- mxPath( from=c("x","y","z"), arrows=2,
free=TRUE, values = c(1,1,1), labels=c("varx","res","varz") )
# covariance of x and z
covPaths <- mxPath( from="x", to="z", arrows=2,
free=TRUE, values=0.5, labels="covxz" )
# regression weights
regPaths <- mxPath( from=c("x","z"), to="y", arrows=1,
free=TRUE, values=1, labels=c("betax","betaz") )
# means and intercepts
means <- mxPath( from="one", to=c("x","y","z"), arrows=1,
free=TRUE, values=c(1,1), labels=c("meanx","beta0","meanz") )
multiRegModel <- mxModel("Multiple Regression Path Specification", type="RAM",
dataCov, manifestVars=c("x","y","z"),
varPaths, covPaths, regPaths, means)
# Create an MxModel object
# -----------------------------------------------------------------------------
multiRegFit<-mxRun(multiRegModel)
summary(multiRegFit)
multiRegFit$output
omxCheckCloseEnough(coef(multiRegFit)[["beta0"]], 1.6312, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["betax"]], 0.4243, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["betaz"]], 0.2265, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["res"]], 0.6272, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["varx"]], 1.1048, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["varz"]], 0.8276, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["covxz"]], 0.2861, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["meanx"]], 0.0540, 0.001)
omxCheckCloseEnough(coef(multiRegFit)[["meanz"]], 4.0610, 0.001)
# Compare OpenMx results to Mx results
# -----------------------------------------------------------------------------
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