monfils 418_variable types

Ieisourinstrumentmeasuring whatwethinkitismeasuring

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Unformatted text preview: acer?
 •  Many
levels
of
an
independent
variable
 –  More
accurate
constraints
on
an
explana$on
 
 
 
But,
there’s
a
cost!

 Why
do
the
number
of
levels
 macer?
 •  Many
levels
of
an
independent
variable
 –  More
accurate
constraints
on
an
explana$on
 
 
 
But,
there’s
a
cost!

 •  Requires:
 •  More
subjects
(between‐subjects
factor),
or
 •  More
$me
to
run
each
subject
(within‐subjects
 factor)
 Relevant
Variables
 •  Variables
that
influence
the
dependent
variable,
 but
are
not
of
interest
in
the
study
in
ques$on
 –  Some$mes
called
‘nuisance’
variables
 •  “Effect
of
coffee
on
response
$me”
experiment
 –  What
other
factors
might
influence
response
$me?
 •  Time
of
day
 •  Arousal
 •  Level
of
anxiety
 Types
of
measures
(for
dependent
 variables)
 •  Tests
 •  Behavioral
measures
 •  Physical
measures
 When
designing
a
test/measurement
 tool,
we
want:
 •  Well‐defined
variables
 •  Appropriate
scales
of
measurement
 •  What
else?
 – Reliability,
&
 – Validity
 Reliability
 •  Consistency
or
stability
of
a
meas...
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