the nomological network. what is the nomological net? l an idea developed by cronbach, l. and meehl,...
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The Nomological NetworkThe Nomological NetworkThe Nomological NetworkThe Nomological Network
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?
An idea developed by Cronbach, L. and An idea developed by Cronbach, L. and Meehl, P. (1955). Construct Validity in Meehl, P. (1955). Construct Validity in Psychological Tests, Psychological Tests, Psychological Psychological BulletinBulletin, 52, 4, 281-302., 52, 4, 281-302.
Nomological is derived from Greek and Nomological is derived from Greek and means “lawful”.means “lawful”.
Links interrelated theoretical ideas with Links interrelated theoretical ideas with empirical evidence.empirical evidence.
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation of the concepts (constructs) of
interest in a study,
ConstructConstruct
ConstructConstruct
ConstructConstruct
ConstructConstruct ConstructConstruct
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation of the concepts (constructs) of
interest in a study,
ConstructConstruct
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObs
ConstructConstruct
ConstructConstruct
ConstructConstruct ConstructConstruct
...their observable manifestations,
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?
A representation of the concepts (constructs) of interest in a study,
...their observable manifestations, and the interrelationships among and among these.
constructconstruct
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObs
constructconstruct
constructconstruct
constructconstruct constructconstruct
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?
ConstructConstruct
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObs
ConstructConstruct
ConstructConstruct
ConstructConstruct ConstructConstruct
Theoretical Level: Concepts, IdeasTheoretical Level: Concepts, Ideas
What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?
ConstructConstruct
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObsObsObs ObsObs
ObsObs ObsObs
ConstructConstruct
ConstructConstruct
ConstructConstruct ConstructConstruct
Theoretical Level: Concepts, IdeasTheoretical Level: Concepts, Ideas
Observed Level: Measures, ProgramsObserved Level: Measures, Programs
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
Scientifically, to make clear what something is means to set forth the laws in which it occurs.
This interlocking system of laws is the Nomological Network.
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
The laws in a nomological network may relate...The laws in a nomological network may relate...
observable properties or quantities to each other.
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
The laws in a nomological network may relate...The laws in a nomological network may relate...
different theoretical constructs to each other.
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
The laws in a nomological network may relate...The laws in a nomological network may relate...
theoretical constructs to observables.
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
At least some of the laws in the network must involve observables.
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
"Learning more about" a theoretical construct is a matter of elaborating the nomological network in which it occurs.
ObsObs ObsObs
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
or of increasing the definiteness of its components.
"Learning more about" a theoretical construct is a matter of elaborating the nomological network in which it occurs...
ObsObs ObsObs
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
The basic rule for adding a new construct or relation to a theory is that it must generate laws
(nomologicals) confirmed by observation...
ObsObs ObsObs
ConstructConstruct
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
The basic rule for adding a new construct or relation to a theory is that it must generate laws
(nomologicals) confirmed by observation...
or reduce the number of nomologicals required to predict some observables.
ObsObs ObsObs
ConstructConstruct
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
Operations that are qualitatively different "overlap" or "measure the same thing"...
PrinciplesPrinciplesPrinciplesPrinciples
ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs
ConstructConstruct ConstructConstruct ConstructConstruct
Operations which are qualitatively different "overlap" or "measure the same thing"...
if their positions in the nomological net tie them to the same construct variable.
The Main Problem with the The Main Problem with the Nomological NetNomological Net
The Main Problem with the The Main Problem with the Nomological NetNomological Net
It doesn't tell us how we can assess the construct
validity in a study.