3 parts of a concept
label
conceptual definition
operational definition
Label
way to refer to something (public opinion, media use, people)
Conceptual Definition
what is the verbal meaning attached to concept label?
sometimes the label is enough, you don't need it. (intelligence: quantitative, analytical, verbal)
Operational Definition
takes verbal meaning from conceptual definition and specifies the steps needed to measure/experience that concept. (develop steps for measuring conceptual definitions and devise a formula)
Operational definition should do a good job representing the conceptual definition, if it doesn't we aren't measuring what we thought we were
4 Levels of measurement
Nominal
Ordinal
Interval
Ratio
Nominal
weakest form
classifies people, things etc.
label for a category
refers to presence/absence of something
equivalence: everything in that category has to be equal
categories: exhausted and mutually exclusive
Ordinal
rank on some dimension but not specific (horse race w/ no stop watch: 1st, 2nd, 3rd)
non specific measurements, you know the order but you do not know the distance between
has an order: any category can fall higher or lower to another
categories: exhausted and mutually exclusive
Interval
equal interval measurements
NO TRUE ZERO: when zero does not mean absence of the thing because you can go below it. (weather)
Ratio
DOES have a true zero, [[must have everything stated in interval]] ——— speed, distance traveled
Why should you start at the highest level of measurement?
you can start high and go low, but you cannot start low and go high
How will 4 levels of measurements be used?
chi squared data ——
pew data —— nominal/ordinal
analysis of variants (calculating mean) —— interval/ratio