PSYCH339 Lecture Notes - Lecture 1: Central Tendency, Level Of Measurement

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10 Aug 2016
Department
Course
Professor
Measurement and Variance
Underlying logic: If members of the organization perform successfully, the
organiation will be successful
Mitt Romney: Corportations are people!
This requires measurement:
- Success
- Performance
- knowledge, skills and abilities
Types of scales:
- Nominal
- Ordinal
- Interval
- Ratio
Nominal scales:
- Involves numbers that represent names (jersey names  number 12 and
number 3)
- Treat nominal data as if its numerical…then you will get a nonsense result
Ordinal scales:
- involves ranking
- how far in between (one comes in first and one comes in second but it
doesn’t tell people how much first beat second by, no equal spacing)
Interval scales:
- Expert rating
- Someone decides to rate someone 88 and 93
- Yes 93 is higher than 88, but its 5 higher but it means something
- Interval: same distance between intervals  there is “no true zero”
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