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Lecture 5

PSYC 2001 Lecture 5: PSYC 2001 -lecture #5

Course Code
PSYC 2001
Deanna whalen

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PSYC 2001 PSYC Methods
Lecture #5 In class Notes
Oct 4th, 2018
RM: Measurement
Level of measurement:
Variables and Measurement Scale/level:
- How we measure the variable
o Nominal scales
o Ordinal scales
o Interval scales
o Ratio scales
- As you move from one scale to the next (follow the arrow) each scale “adds” one new
criteria from the previous scale
- Some fall in one type of measurement over others
- Each one of these terms going from easiest to complicated (nominal ratio)
Categorical (Nominal):
- Categories with no meaningful numeric value (no order to it)
- Not one is better than the other, just different options that exist
o Ex:
Experimental condition/control condition
- Impossible to define any quantitative values or differences across categories
o We convert info to numbers (computers can assist us) but there is no ‘natural’ unit
or value to the categories
o Ex. Can call females a 22 or a 7 it doesn’t matter it just makes it easier when
coding instead of having to write the word over and over
Ordinal Scale:
- Rank ordering with numeric values
- Ex:
o Restaurant ratings
o Birth order
o Olympic medals
o Races (1st, 2nd, 3rd, 4th)
- Has magnitude; values are smaller or larger than the next
- Interval between items not known (don’t have the time between the first and second
placing people in a race) (know the 1st person was faster but don’t know by how much)
o How close was second place from getting gold?
Was it a photo finish or hours in between?
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