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Variables, Scales of Measurement, Validity & Reliability
Descripción
(Week 6 & 7) HBS108 Mapa Mental sobre Variables, Scales of Measurement, Validity & Reliability, creado por shirley.ha el 02/09/2013.
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hbs108
week 6 & 7
hbs108
week 6 & 7
Mapa Mental por
shirley.ha
, actualizado hace más de 1 año
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shirley.ha
hace casi 11 años
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Resumen del Recurso
Variables, Scales of Measurement, Validity & Reliability
Variables
the factors that you are interested
any quantitative measurement of an entity, attribute, or phenomenon being studied in the study sample.
Independent aka Study/Treatment variable
one that is assumed to remain constant or uninfluenced by changing conditions or circumstances in the study.
can change the value of the dependent variable (DV)..
cause of the DV and should always precede the DV and has a potential influence on it
FIXED
Values= Levels
Dependent aka Outcome variable
changes in ways that are determined by the influence of an independent variable or external factors.
value of the DV can be affected by the IV
value of the DV depends on the action of levels of the IV
the phenomenon that the researcher seeks to understand, explain or predict.
Confounding
sometimes called extraneous or intervening) variable(s)
Aim of research
identify how independent (or study) variables
influence a dependent (or outcome) variable
preferably to develop a generalisable model (through statistical analysis)
can explain and predict that relationship
identification of variable characteristics is very important in planning, conducting and critically examining research.
Measurements
involves the process of description and quantification in research
relates to the recording of physical or behavioural characteristics by assigning a value to aspects
quality, quantity, frequency or degree of these attributes.
use of an instrument or tool that is capable of measuring the magnitude of the attribute (or variable) under evaluation by using a calibrated scale
involves assigning a value (usually numerical) to an object
can be measured directly (length, width, death rate) whilst others can only be indirectly measured through an abstraction
Categorical
variables with discrete values rather than incremental placement along a continuum
assign values to categories
gender, diagnosis and country of birth
measured using nominal or ordinal scales
Continuous
measured along an infinitely divisible scale.
one that can take on a large range of values representing a continuum.
height, weight, blood pressure and age
measured using interval or ratio scales.
Continuous tranformed into categorical but not vice versa
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