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# ===========
# = HISTORY =
# ===========
# 2017-04-14 05:07PM TBATES THIS SCRIPT doesn't run - needs new WLS objective
#
# Copyright 2007-2018 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: BivariateSaturated_MatrixCov.R
# Author: Hermine Maes
# Date: 2009.08.01
#
# ModelType: Saturated
# DataType: Continuous
# Field: None
#
# Purpose:
# Bivariate Saturated model to estimate means and (co)variances
# Matrix style model input - Covariance matrix data input
# Uses WLS for model fit
#
# RevisionHistory:
# Hermine Maes -- 2009.10.08 updated & reformatted
# Ross Gore -- 2011.06.15 added Model, Data & Field metadata
# Tim Brick -- 2012.06.08 updated to use WLS modeling
# -----------------------------------------------------------------------------
require(OpenMx)
require(MASS)
# Load Libraries
# -----------------------------------------------------------------------------
set.seed(200)
rs = .5
xy <- mvrnorm (1000, c(0,0), matrix(c(1,rs,rs,1),2,2))
testData <- xy
selVars <- c("X","Y")
dimnames(testData) <- list(NULL, selVars)
summary(testData)
covData <- cov(testData)
# Simulate Data
# -----------------------------------------------------------------------------
bivSatModel3 <- mxModel("bivSat3",
mxMatrix("Symm", nrow=2, ncol=2, free=T, values = c(1,.5,1), name = "expCov"),
mxData(observed=covData, type="cov", numObs=1000),
mxFitFunctionWLS(covariance="expCov", dimnames=selVars)
)
bivSatFit3 <- mxRun(bivSatModel3)
EC3 <- mxEval(expCov, bivSatFit3)
LL3 <- mxEval(objective,bivSatFit3)
bivSatSummary3 <- summary(bivSatFit3)
SL3 <- bivSatSummary3$SaturatedLikelihood
omxCheckEquals(bivSatSummary3$observedStatistics, nrow(covData) * (ncol(covData) + 1) / 2)
Chi3 <- LL3-SL3
# example 3: Saturated Model with Cov Matrices and Matrix-Style Input
# -----------------------------------------------------------------------------
bivSatModel3m <- mxModel("bivSat3m",
mxMatrix(
type="Symm",
nrow=2,
ncol=2,
free=T,
values=c(1,.5,1),
name="expCov"
),
mxMatrix(
type="Full",
nrow=1,
ncol=2,
free=T,
values=c(0,0),
name="expMean"
),
mxData(
observed=cov(testData),
type="cov",
numObs=1000,
means=colMeans(testData)
),
imxWLSObjective(
covariance="expCov",
means="expMean",
dimnames=selVars
)
)
bivSatFit3m <- mxRun(bivSatModel3m)
EM3m <- mxEval(expMean, bivSatFit3m)
EC3m <- mxEval(expCov, bivSatFit3m)
LL3m <- mxEval(objective,bivSatFit3m)
SL3m <- summary(bivSatFit3m)$SaturatedLikelihood
Chi3m <- LL3m-SL3m
# example 3m: Saturated Model with Cov Matrices & Means and Matrix-Style Input
# -----------------------------------------------------------------------------
nWeights <- 5
bivSatModel3w <- mxModel("bivSat3w",
mxMatrix(
type="Symm",
nrow=2,
ncol=2,
free=T,
values=c(1,.5,1),
name="expCov"
),
mxMatrix(
type="Full",
nrow=1,
ncol=2,
free=T,
values=c(0,0),
name="expMean"
),
mxMatrix("Iden",5,5,free=FALSE, name="weightMat"),
mxData(
observed=cov(testData),
type="cov",
numObs=1000,
means=colMeans(testData)
),
imxWLSObjective(
covariance="expCov",
means="expMean",
weights="weightMat",
dimnames=selVars
)
)
bivSatFit3w <- mxRun(bivSatModel3w)
EM3w <- mxEval(expMean, bivSatFit3w)
EC3w <- mxEval(expCov, bivSatFit3w)
LL3w <- mxEval(objective,bivSatFit3w)
SL3w <- summary(bivSatFit3w)$SaturatedLikelihood
Chi3w <- LL3w-SL3w
# example 3w: Saturated Model with Cov Matrices & Means and Matrix-Style Input Plus Weights = I
# ---------------------------------------------------------------------------------------------
Mx.EC1 <- matrix(c(1.0102951, 0.4818317, 0.4818317, 0.9945329),2,2)
Mx.LL1 <- -2.258885e-13
# example Mx..1: Saturated Model with
# Cov Matrices
# -------------------------------------
Mx.EM1m <- matrix(c(0.03211648, -0.004883811),1,2)
Mx.EC1m <- matrix(c(1.0102951, 0.4818317, 0.4818317, 0.9945329),2,2)
Mx.LL1m <- -5.828112e-14
# example Mx..1m: Saturated Model with
# Cov Matrices & Means
# -------------------------------------
# Mx answers hard-coded
# -----------------------------------------------------------------------------
omxCheckCloseEnough(Chi3,Mx.LL1,.001)
omxCheckCloseEnough(EC3,Mx.EC1,.001)
# 3:CovMat
# -------------------------------------
omxCheckCloseEnough(Chi3m,Mx.LL1m,.001)
omxCheckCloseEnough(EC3m,Mx.EC1m,.001)
omxCheckCloseEnough(EM3m,Mx.EM1m,.001)
# 3m:CovMPat
# -------------------------------------
omxCheckCloseEnough(Chi3w,Mx.LL1m,.001)
omxCheckCloseEnough(EC3w,Mx.EC1m,.001)
omxCheckCloseEnough(EM3w,Mx.EM1m,.001)
# 3w:CovMPat
# -------------------------------------
# Compare OpenMx results to Mx results
# (LL: likelihood; EC: expected covariance, EM: expected means)
# -----------------------------------------------------------------------------
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