monfils 418_variable types

Timeofday arousal levelofanxiety

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Unformatted text preview: are
like
interval
scales,
except
they
have
 a
true
zero
point Variables
types

   Discrete variables are
variables
that
can
take
on
only
a
small
 number
of
values.
   E.g.,
sex,
marital
status
   Con4nuous variables are
variables
that
can
take
on
any
value
 between
the
highest
&
lowest
points
of
a
scale.
   E.g.,
speed,
height
   Independent variables are
the
variables
being
manipulated.
   E.g,
environment,
amount
of
morphine
   Dependent variables
are
the
variables
being
measured.

   E.g.,
$me
un$l
next
dose
of
morphine
 Levels
of
varia$on
of
the
 independent
variable
 •  Two
key
ques$ons
about
levels
of
independent
 variables
 –  How
many
levels
should
we
use?
 –  Which
ones?
 •  Beliefs
about
the
possible
outcomes
should
guide
 answers.
 Why
do
the
number
of
levels
 macer?
 •  Many
levels
of
an
independent
variable
 –  More
accurate
constraints
on
an
explana$on
 

 

 Why
do
the
number
of
levels
 m...
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This document was uploaded on 02/19/2014 for the course PSY 418 at University of Texas at Austin.

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