PSYC3250 Lecture 1: PSYCH 3250 - lecture1

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PSYCH 3250
PSYCHOLOGICAL MEASUREMENT
LECTURE 1
What is Psychological Measurement: measure people’s characteristics such as personality
and IQ.
How do you measure someone’s height?
How do you measure the distance between someone’s pupils?
How do you measure a persons creativity?
How do you measure someone’s potential to be a good leader?
Have a good creative measure.
Hard to assign a number to these criteria
Measurement consists of rules for assigning symbols to objects in order too:
-represent quantities of attributes of people
-measurement involves rules indicating how numbers will be assigned to attributes
Typical Assessment Activities
Clinical: intelligence, psychopathology
Counseling: career interest, skills and social adjustment
Industrial/organizational: managerial potential, training needs, cognitive and
psychomotor activity
School psychology: ability and academic progress, maturity and readiness in school,
children with disabilities
Psychometrics
-The science of psychological measurement
-Psychometrician
Psychometric Soundness
-How consistently -> later refer to this as reliability (later on) and how accurately a
psychological test measures what it purports to measure.
-Accuracy (validity): is it actually giving you a good number?
-Myers: not consistent nor accurate.
-EX: do not measure IQ with a bathroom
Psychological Tests
Definition: psychological test is a measurement instrument
that has three defining characteristics:
1.A psychological test is a sample of behavior
2.The sample is obtained under standardized conditions
3.There are established rules for scoring or for obtaining
quantitative (numeric) information from behavior sampling.
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A sample of behavior
-Every psychological test requires the respondent to do
-something (ex: driving test or filling bubbles in a scan-tron)
-There is no exhaustive testing.
-The respondents behavior/response is used to measure some
-specific attribute, or to predict some specific outcome.
-
-A psychological test is not an exhaustive measurement of all possible behaviors
that could be used in measuring or defining a particular attribute
-The quality of the test is largely determined by the representativeness of the
sample of behaviour. (It does not take into account every type of behavior)
Example –sample of behaviour
The following 4 items are samples of how a person might demonstrate the personality
trait of humility. Although these 4 items together make up a humility scale, there are
other items that could be used – these 4 samples are not exhaustive:
I am an ordinary person who is no better than others.
I wouldn’t want people to treat me as though I were superior to
them.
I think that I am entitled to more respect than the average person
is
I want people to know that I am an important person of high
status.
Reverse Key Items (I love my job to I hate my job) – they are asking the
opposites of the continuum.
The most important thing here, is that they’re a ton of humility questions you can
ask. These are just subsets. (Infinite number of ways you can word your
questions)
These four items represent a random sample of what you can use – thus this
sampling is not exhaustive.
EX 2: 80’s music appreciation
-Rate all of the songs from the 80’s and get your average liking. (This is
exhaustive)
-Random sample of 10 songs from that list and then get the rating then get an
average.
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