monfils 418_variable types

Siegelsaysinthisarcleheseems

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Unformatted text preview: 
span,
and
there
are
all
sorts
of
 reasons
why
that
could
be
so.
There
are
many
illnesses
and
 condi$ons
that
cause
weakness
and
fa$gue
and
people
suffering
 from
those
oXen
sleep
more
than
8
hours
a
night.
So,
the
"shorter
 life
span"
may
well
be
caused
by
condi$ons
that
have
nothing
to
do
 with
sleep
per
se,
but
that
are
also
causing
excessive
sleep.This
is
so
 basic
a
point
that
it's
hard
to
believe
any
reputable
study
could
 ignore
it,
but
based
on
what
Dr.
Siegel
says
in
this
ar$cle,
he
seems
 to
assume
that
if
we
sleep
too
much
we'll
get
unhealthy,
rather
than
 (much
more
likely‐seeming)
that
if
we're
unhealthy,
we'll
sleep
too
 much.
 What
is
a
variable?
 Opera$onal
defini$ons
 •  Opera$onal
defini$ons
 –  Allow
a
construct
to
be
studied
 –  If
two
or
more
values
are
tested,
the
construct
is
a
 variable
 –  If
only...
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This document was uploaded on 02/19/2014 for the course PSY 418 at University of Texas.

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