amos introduction feb18 2007 right1

8/18/2019 AMOS Introduction Feb18 2007 Right1

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OverviewOverview

Introduction to AMOS User Interface

AMOS GraphicsExamples of using AMOS Predictors of Problem rin!ing using

Path anal"sis


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SEM SoftwareSEM Software Several different packages exist EQS, LISREL, MPLUS, AMOSAMOS, SAS, ...

Provide simltaneosl!simltaneosl! overall tests of model fit individal parameter estimate tests

Ma! compare simltaneosl!simltaneosl! Regression coefficients Means "ariances

even across multiple between-subjects groupseven across multiple between-subjects groups


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AMOS AdvantagesAMOS Advantages

Eas" to use for visual SEMvisual SEM # Structural E$uation Modeling%&

Eas" to modif"' viewmodif"' view the modelPublication ($ualit" graphicsgraphics


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Structural E$uation ModelingStructural E$uation Modeling#SEM%#SEM%

An extension of )egression andgeneral *inear Models

Also can +t more complex models'li!e con+rmator" factor anal"sis

and longitudinal data&


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#amil! $ree of SEM#amil! $ree of SEM ,-testA.O/A

Multi-wa"

A.O/A )epeatedMeasureesigns Growth

0urveAnal"sis

1ivariate0orrelation

Multiple)egression

PathAnal"sis

StructuralE$uationModeling

2actorAnal"sis

Explorator"2actor

Anal"sis

0on+rmator"2actor

Anal"sis

*atent*atent

GrowthGrowth0urve0urve

Anal"sisAnal"sis


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Structural E$uation ModelingStructural E$uation Modeling

#SEM%#SEM%Observed variables 3measuredmeasured

*atent variables3unobservedunobserved

ExogenousExogenous

variables3independentindependent

Endogenous variables

3dependentdependent


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Structural E$uationStructural E$uation

GraphsGraphs

ObservedObserved

/ariable/ariable

*atent*atent/ariable/ariable

&45

ErrorError

6 *oading*oading

&47 6 ))88


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Example6 0ondom UseExample6 0ondom Use

ModelModel

Gender

Peer norms

a%ot condoms

0ondom use

Impulsive ecision Ma!ing

IM04)

Observed/ariables

*atent/ariables

&45

*oadings

*egend*egend

IMA4) IME4) IM94)

ImpulsiveecisionMa!ing

Observed variables for

Impulsive decision ma!ing

&ondom attitde


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ModelModelIM04)

Observed/ariables

*atent/ariables

&45

*oadings

*egend*egend

IMA4) IME4) IM94)

Independent

ependent

ependentependent

Independent

ependent

Gender

Peer norms

a%ot condoms

0ondom use

Impulsive ecision Ma!ing

&ondom attitde


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ModelModel

eS:;)04

efr4

eiss

IM04)

eidm


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ModelModel

SE:4

eS:;)04

efr4

eiss

IM04)

eidm


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ModelModel

eS:;)04

efr4

eiss

IM04)

eidm

-&7?

-&47-&4@-&45 &4=

&5=& &8< & &


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AMOS 0omponentsAMOS 0omponents

AMOS GraphicsAMOS Graphics draw SEM graphsgraphs

runs SEM models using graphs

AMOS 1asic runs SEM models using s"ntax


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Starting AMOS GraphicsStarting AMOS Graphics

Start Programs Amos ? Amos Graphics


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)eading ata into AMOS

2ile2ile ata 2ilesata 2iles

,he following dialog appears6


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)eading ata into AMOSClick on

File NameFile Name to specify thename of the data file

Currently AMOS reads the following

data file formats: Access

d'ase ( ) *

Microsft Excel (, +, *, and - #oxPro ./, .* and .0

Lots 1k2, 1k(, and 1k+

SPSSSPSS *.sav files*.sav files, versions -./. t3rog3 2*./

4%ot3 ra1 data and matrix formats5


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)eading ata into AMOS

Example USE toda"6 Predicting parental monitoring andPredicting parental monitoring and

problem drin!ing using a PA,B IAG)AM&problem drin!ing using a PA,B IAG)AM&

A,ASE,6onl"CvalidCpathCfeb4@C877-n5


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rawing in AMOSIn Amos Graphics' a model can bespeci+ed b" drawing a diagram onthe screen 1. o draw an o!ser"ed "aria!le# click

$%iagram$ on the top menu# andclick $%raw O!ser"ed%raw O!ser"ed.$ Mo"e the

cursor to the place where you wantto place an o!ser"ed "aria!le andclick your mouse. %rag the !o& inorder to ad'ust the si(e of the !o&.)ou can also use in the tool!o& to draw o!ser"ed "aria!les.

*. +no!ser"ed "aria!les can !e drawnsimilarly. Click $%iagram$ and

$%raw +no!ser"ed%raw +no!ser"ed.$ +no!ser"ed"aria!les are shown as circles.)ou may also use in the tool!o&

to draw uno!ser"ed "aria!les.


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rawing in AMOSrawing in AMOS

,o draw a path' 0lic! Diagramiagram on the top menu

and clic! Draw Pathraw Path& Instead of using the top menu' "ou ma" use the ,ool 1ox buttons to draw arrows # and %&


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rawing in AMOS

,o draw Error ,erm to the observed andunobserved variables&

Use DUni$ue /ariableUni$ue /ariable button in the ,ool 1ox&0lic! and then clic! a box or a circle towhich "ou want to add errors or a uni$uevariablesFhen "ou use Uni$ue /ariable button' thepath coeHcient will be automaticall" constrained to 4&%


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rawing in AMOS*et us draw6


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6aming t3e varia%les in6aming t3e varia%les in AMOSAMOS

,o name a variable' 0lic! D/iew on thetop menu and clic! DObect PropertiesObect Properties

J0lic! on the box "ouwant to name

0lic! on the ,ext ,ext tab andenter the name of the

variable in the /ariable/ariablenamename +eld and Kor /ariable *abel


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Naming the variables in AMOS

Example6 .ame the variables


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&onstraining a parameter in AM7S&onstraining a parameter in AM7S

,he scale of the latent variable or variance ofthe latent variable has to be +xed to 4&

0lic! D7%8ect Properties7%8ect Properties9,t3en on the arrow

between P).,M.,4 and eprnt &

0lic! on the

ParametersParameters tab and

enter the value D11 inthe )egression weight)egression weight +eld6


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Improving t3e appearanceImproving t3e appearance

of t3e pat3 diagramof t3e pat3 diagram ;ou can change the appearance of "our pathdiagram b" moving obects around

,o move an obect' clic! on the MoveMove icon on thetoolbar& ;ou will notice that the picture of a little

moving truc! appears below "our mouse pointerwhen "ou move into the drawing area& ,his lets "ou!now the MoveMove function is active&

,hen clic! and hold down "our left mouse button onthe obect "ou wish to move& Fith the mousebutton still depressed' move the obect to where"ou want it' and let go of "our mouse button& AmosAmos

GraphicsGraphics will automaticall" redraw all connectingarrows&


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Improving t3e appearance of t3eImproving t3e appearance of t3e

pat3 diagrampat3 diagram

,o change the siLe and shape of an obect'+rst press the 0hange the shape of obects0hange the shape of obects icon on the toolbar&

;ou will notice that appears under the

mouse pointer to let "ou !now the ShapeShape function is active&

0lic! and hold down "our left mouse buttonleft mouse button on the obect "ou wish to re-shape& 0hangethe shape of the obect to "our li!ing andrelease the mouse button&

0hange the shape of obects0hange the shape of obects

also wor!s ontwo-headed arrows& 2ollow the sameprocedure to change the direction or arc ofan" double-headed arrow&


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Improving t3e appearance of t3e

pat3 diagramIf "ou make a mistakemake a mistake' there are alwa"sthree icons on the toolbar to $uic!l" bail"ou out6 the EraseErase and UndoUndo functions&

,o erase an object erase an object ' simpl" clic! on the

EraseErase

icon and then clic! on the obect"ou wish to erase&

,o undo your last drawing activity undo your last drawing activity ' clic!on the

UndoUndo icon and "our last activit"

disappears&Each time "ou clic! Undo'Undo' "our previousactivit" will be removed&

If you change your mindIf you change your mind' clic! on )edo)edo to restore a change&


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Performing t3ePerforming t3e

anal!sis in AM7Sanal!sis in AM7S

/iew/iew→→ Anal"sisAnal"sis

PropertiesProperties and clic!on the OutputOutput tab&

,here is also anAnal"sis PropertiesAnal"sis Properties icon "ou can clic! onthe toolbar& Eitherwa"' the OutputOutput

tabgives "ou thefollowing options6


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Performing t3e anal!sis in AM7S

2or our example' chec! the MinimiLation histor"'MinimiLation histor"'StandardiLed estimatesStandardiLed estimates' and S$uared multipleS$uared multiplecorrelationscorrelations boxes& #We are doing this becausethese are so commonly used in analysis

%&

,o run AMOSAMOS' clic! on the 0alculate estimates0alculate estimates icon on the toolbar&

AMOSAMOS will want to save this problem to a +le& if "ou have given it no +lename' the Save AsSave As

dialog box will appear& Give the problem a +lename let us sa"' tutorial1tutorial16


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)esults)esultsFhen AMOSAMOS has completed thecalculations' "ou have

two

optionsfor viewing the output6 text output text output ,

graphics output graphics output &

2or text output' clic! the /iew ,ext/iew ,ext

OutputOutput icon on the toolbar&

Bere is a portion of the text outputfor this problem6


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The model is recursive. Sample size = 754The model is recursive. Sample size = 754

Chi-square=Chi-square=49.98449.984 Degrees of Freedom =9Degrees of Freedom =9a!imum "i#elihood $s%ima%esa!imum "i#elihood $s%ima%es

Results for Path Model

&egressio' (eigh%s) *+roup 'um,er - Defaul% model


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S%a'dardized &egressio' (eigh%s) *+roup 'um,er - Defaul% model


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S%a'dardized &egressio' (eigh%s) *+roup 'um,er - Defaul% model


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"ie1ing t3e grap3ics otpt in AM7S"ie1ing t3e grap3ics otpt in AM7S

J ,o view the graphics output'clic! the /iew output/iew output icon nextto the drawing area&

J 0hose to view eitherunstandardizedunstandardized or #if "ou selectedthis option% standardizedstandardized

estimates b" clic! one or theother in the Parameter 2ormatsParameter 2ormats panel next to "our drawing area6


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UnstandardiLed path model


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Improving t3e appearance of t3e pat3Improving t3e appearance of t3e pat3

diagramdiagram

,o move the parameters' clic!on the DMove Parametervalues and then clic! on thepath' and move the parameter


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0onclusion6 Amos In

nutshell ,oda" we learned O.E thing6

how to draw a model in AMOS ,opics for the next few wee!s 6

assess and interpret the models compare models anal"Le more complex models

amos introduction feb18 2007 right1

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