RESEARCH METHODS Lecture 6

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Presentation transcript:

RESEARCH METHODS Lecture 6

VARIABLE

Variable A central idea in research. Variable is a concept that varies. Anything (concept/term) that can take on differing or varying values. 2+ values. Could be numerical. Variation can be in quantity, intensity, amount, or type. Examples Production units, Absenteeism, Gender, Religion, Motivation, Grade, Age.

Types of Variable

Continuous and Discontinuous Variable Can the values be divided into fractions? Discontinuous  Discrete categories. Categorical. Classificatory.

Dependent and Independent Variable DV  Outcome variable  effect variable (Y). Variation in Y is influenced by some other factor (s) IV  (X) that influences the Y. The variance in Y is accounted for by X.

Explaining X and Y variables X variable Presumed cause Stimulus Predicted from Antecedent Manipulated Predictor Y variable Presumed effect Response Predicted to Consequence Measured outcome Criterion

Moderating Variable A variable that moderates the strength of X – Y relationship. Strong relationship between the library facility (X) and performance of students (Y). Depends on the “interest and inclination” of students (MV). Modifies the original relationship. Relationship is contingent on another variable.

Intervening Variable Surfaces between the time X starts influencing the Y. Time factor. In fact is a function of X. IV  IVV  DV. IVV may be DV for IV in the first place, then it is IV for DV. Marital status  social integration  Suicide. 4-day workweek (IV) will lead to higher productivity (DV) by increasing job satisfaction (IVV).

Extraneous Variables Infinite number of EV exist that may effect XY relationship. Confounding factors. To be identified by the researcher.

Whether a variable is X or Y or moderating or intervening is determined by the researcher.

Relationship of Variables Relationship among variables. Logical. A statement concerned with the theoretical relationship among variables is a proposition. If the relationship refers to an observable reality, then the proposition may be testable  call it a hypothesis.

RESEARCH METHODS Lecture 6