The Nomological NetworkWhat Is the Nomological Net?Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8PrinciplesSlide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19The Main Problem with the Nomological NetThe Nomological NetworkThe Nomological NetworkThe Nomological NetworkThe Nomological NetworkWhat 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 representationWhat 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,ConstructConstructConstructConstructConstructConstructConstructConstructConstructConstructWhat 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,ConstructConstructObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructConstructConstruct...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.constructconstructObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsconstructconstructconstructconstructconstructconstructconstructconstructWhat Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?ConstructConstructObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructConstructConstructTheoretical Level: Concepts, IdeasTheoretical Level: Concepts, IdeasWhat Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?ConstructConstructObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructConstructConstructTheoretical Level: Concepts, IdeasTheoretical Level: Concepts, IdeasObserved Level: Measures, ProgramsObserved Level: Measures, ProgramsPrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructScientifically, 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.PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructThe laws in a nomological network may relate...The laws in a nomological network may relate...observable properties or quantities to each other.PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructThe laws in a nomological network may relate...The laws in a nomological network may relate...different theoretical constructs to each other.PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructThe laws in a nomological network may relate...The laws in a nomological network may relate...theoretical constructs to observables.PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructAt least some of the laws in the network must involve observables.PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstruct"Learning more about" a theoretical construct is a matter of elaborating the nomological network in which it occurs.ObsObsObsObsPrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructor 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...ObsObsObsObsPrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructThe basic rule for adding a new construct or relation to a theory is that it must generate laws (nomologicals) confirmed by observation...ObsObsObsObsConstructConstructPrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructThe 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.ObsObsObsObsConstructConstructPrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructOperations that are qualitatively different "overlap" or "measure the same thing"...PrinciplesPrinciplesPrinciplesPrinciplesObsObsObsObsObsObsObsObsObsObsObsObsConstructConstructConstructConstructConstructConstructOperations 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 NetThe Main Problem with the The Main Problem with the Nomological NetNomological NetIt doesn't tell us how we can assess the construct validity in a