null
US
Sign In
Sign Up for Free
Sign Up
We have detected that Javascript is not enabled in your browser. The dynamic nature of our site means that Javascript must be enabled to function properly. Please read our
terms and conditions
for more information.
Next up
Copy and Edit
You need to log in to complete this action!
Register for Free
186962
Variables, Scales of Measurement, Validity & Reliability
Description
HBS108 (Week 6 & 7) Mind Map on Variables, Scales of Measurement, Validity & Reliability, created by shirley.ha on 02/09/2013.
No tags specified
hbs108
week 6 & 7
hbs108
week 6 & 7
Mind Map by
shirley.ha
, updated more than 1 year ago
More
Less
Created by
shirley.ha
over 11 years ago
65
1
0
Resource summary
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
Show full summary
Hide full summary
Want to create your own
Mind Maps
for
free
with GoConqr?
Learn more
.
Similar
Topic 7: Quantitative Research - Sampling, Data Collection & Measurement
shirley.ha
Prob Methods of sampling
shirley.ha
Categorical & Cont variables
shirley.ha
Confounding
shirley.ha
Non-probability sampling methods
shirley.ha
Reliability & Validity
shirley.ha
Week 6 Bias LO
shirley.ha
Quantitive Data Collation
shirley.ha
Observational Study Designs
shirley.ha
Other studies
shirley.ha
RCT
shirley.ha
Browse Library