,1 .
I
types of variables
·
qualitative variable -- nominal , ordinal
·
quantitative -> interval / ratio
qualitative variables >
-
categorical
nominal different categories
·
:
S c o re and space no
meaning
↳ hair colour : brown/blond , red
·
Ordinal : Space no meaning but categories are ordered
↳ Low ,
medium , high
quantitative variables -
>continuous
interval difference between scores have a
meaning
· :
↳ ordered
e -0 and 200
.
giq
·
razio :
absolute zero
↳ discrete
↳ space
meaning
ratio
↳ of scores
meaning Ful
e age
.
g
scheme of different types of variables
, 1 . 2 Summarizing data
Frequency table
rows
horizontally
·
columns
vertically
·
·
no
missing scores - valid percentage
·
cumulative percentage
bar chart
vertical axis
frequency
·
·
horizontal - > Scores
· used fo r qualitative
·
also nominal i
~
↳ no
meaning distance
outco
histogram
·
qualizative
no space between bars- > width has a
meaning
·
↳ each bar equal to 1
Sur face
frequency
↳ =
234567
1 .
3 theoretic distribution symmetric distribution
·
very large sample -
> theoretic distribution ·
mode= medium =
averag
·
population distribution - > whole population ·
variance -
> how peaked
a b ↳ measure of spr
1 &
↳ how much subje
1
I
Positive skewed negative sicewed
crights CLeft)
I
types of variables
·
qualitative variable -- nominal , ordinal
·
quantitative -> interval / ratio
qualitative variables >
-
categorical
nominal different categories
·
:
S c o re and space no
meaning
↳ hair colour : brown/blond , red
·
Ordinal : Space no meaning but categories are ordered
↳ Low ,
medium , high
quantitative variables -
>continuous
interval difference between scores have a
meaning
· :
↳ ordered
e -0 and 200
.
giq
·
razio :
absolute zero
↳ discrete
↳ space
meaning
ratio
↳ of scores
meaning Ful
e age
.
g
scheme of different types of variables
, 1 . 2 Summarizing data
Frequency table
rows
horizontally
·
columns
vertically
·
·
no
missing scores - valid percentage
·
cumulative percentage
bar chart
vertical axis
frequency
·
·
horizontal - > Scores
· used fo r qualitative
·
also nominal i
~
↳ no
meaning distance
outco
histogram
·
qualizative
no space between bars- > width has a
meaning
·
↳ each bar equal to 1
Sur face
frequency
↳ =
234567
1 .
3 theoretic distribution symmetric distribution
·
very large sample -
> theoretic distribution ·
mode= medium =
averag
·
population distribution - > whole population ·
variance -
> how peaked
a b ↳ measure of spr
1 &
↳ how much subje
1
I
Positive skewed negative sicewed
crights CLeft)
