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Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases...

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Inf. Stats Two Variables We often wish to compare two different variables Examples: different tests results, age and ability, education (in years) and income, speed and accuracy,... Methods to compare two (or more) variables: correlation coefficient regression analysis Notate bene! numeric variables 1
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Page 1: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsTw

oV

aria

ble

s

We

ofte

nw

ish

toco

mpa

retw

odi

ffere

ntva

riabl

es

Exa

mpl

es:

diffe

rent

test

sre

sults

,age

and

abili

ty,e

duca

tion

(inye

ars)

and

inco

me,

spee

dan

dac

cura

cy,..

.

Met

hods

toco

mpa

retw

o(o

rm

ore)

varia

bles

:

corr

elat

ion

coef

ficie

nt

regr

essi

onan

alys

is

Not

ate

bene

!

num

eric

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bles

1

Page 2: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsB

ackg

roun

d

Term

inol

ogy:

we

spea

kof

CA

SE

S,e

.g.,

Joe,

Sam

,

���

and

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RIA

BL

ES

,e.g

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ight

(

� )an

dw

eigh

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hen

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ble

has

aV

AL

UE

for

each

case

,

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e’s

heig

ht,

and

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ght.

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pare

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varia

bles

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ring

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rva

lues

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ase

tofc

ases

,

� � vs.

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2

Page 3: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsTa

bula

rP

rese

ntat

ion

Exa

mpl

e:

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penb

rouw

ers

mea

sure

dpr

onun

ciat

ion

diffe

renc

esam

ong

pairs

ofdi

alec

ts.

We

com

pare

thes

eto

the

geog

raph

icdi

stan

cebe

twee

npl

aces

they

’resp

oken

.

Dia

lect

Pai

rP

hon.

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t.G

eo.D

ist.

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elo/

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rlem

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elo/

Ker

krad

e

� ���

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kum

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st

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ade

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. . .. . .

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krad

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akku

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oode

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ol

���

�� M

akku

m/S

oest

� �

���R

oode

scho

ol/S

oest

����

���Tw

ova

riabl

es—

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etic

and

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raph

icdi

stan

ce,a

nd

�� case

s(h

ere,

each

pair

isa

sepa

rate

CA

SE

).

3

Page 4: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsS

catte

rplo

ts

One

usef

ulte

chni

que

isto

visu

aliz

eth

ere

latio

nby

grap

hing

it.

G E

O _

D S

T

4 0

0 3

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. 9

. 8

. 7

. 6

. 5

4

Page 5: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsS

catte

rplo

ts

Eac

hdo

tis

aca

se,w

hose

� -val

ueis

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dist

ance

,and

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ueph

on.

dist

ance

.

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O _

D S

T

4 0

0 3

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. 8

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. 5

Inge

nera

l,w

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e

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PE

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EN

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riabl

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entia

lly)

DE

PE

N-

DE

NT

ones

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ther

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cede

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son

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ance

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tit

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ht(w

hile

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isim

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5

Page 6: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsLe

ast

Squ

ares

Reg

ress

ion

The

sim

ples

tfor

mof

depe

nden

ceis

LIN

EA

R—

the

inde

pend

entv

aria

ble

dete

rmin

esa

port

ion

ofth

ede

pend

entv

alue

.

We

can

visu

aliz

eth

isas

fittin

ga

stra

ight

line

toth

esc

atte

rplo

t.

G E

O _

D S

T

4 0

0 3

0 0

2 0 0

1

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0

P H O N _ D S T

1 . 3

1 . 2

1 . 1

1 . 0

. 9

. 8

. 7

. 6

. 5

6

Page 7: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsLe

ast

Squ

ares

Reg

ress

ion

G E

O _

D S

T

4 0

0 3

0 0

2 0 0

1

0 0

0

P H O N _ D S T

1 . 3

1 . 2

1 . 1

1 . 0

. 9

. 8

. 7

. 6

. 5

Like

ever

yst

raig

htlin

e,th

isha

san

equa

tion

ofth

efo

rm:

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epo

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ses

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s,th

e

� -IN

TE

RC

EP

T,a

nd

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SL

OP

E.

7

Page 8: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsP

redi

cted

vs.

Obs

erve

dV

alue

s

The

inde

pend

ent

varia

ble

dete

rmin

esth

ede

pend

ent

valu

e(s

omew

hat)

;th

isis

the

pred

icte

dva

lue

� � —th

eva

lue

onth

elin

e.

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eal

soth

eac

tual

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eda

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ays

the

sam

e.

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O _

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T

4 0

0 3

0 0

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1

0 0

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1 . 3

1 . 2

1 . 1

1 . 0

. 9

. 8

. 7

. 6

. 5

8

Page 9: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsR

esid

uals

The

diffe

renc

ebe

twee

npr

edic

ted

and

actu

alva

lues

�� �!� � � " is

the

RE

SID

UA

L—

wha

tthe

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rm

odel

does

not

pred

ict.

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vert

ical

dist

ance

betw

een

the

dota

ndth

elin

e.

LE

AS

T-S

QA

RE

SR

EG

RE

SS

ION

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the

line

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chm

inim

izes

the

squa

red

resi

dual

s—fo

ral

lthe

data

.

� � � ! � � � "�

9

Page 10: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsS

PS

SR

egre

ssio

n

Leas

t-sq

ares

regr

essi

onfin

dsth

ebe

stst

raig

htlin

ew

hich

mod

els

the

data

(min

imi-

zes

the

squa

red

erro

r).

**

MUL

TI

PL

ERE

GRE

SS

IO

N*

*

Equation

Number1

Dependent

Variable..

PHON_DST

Block

Number

1.

Method:

Enter

GEO_DST

Analysis

ofVariance

[ignore!]

-----------Variables

intheEquation

-------------

Variable

BSEB

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(Constant)

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.104898

� �# �$��# �##�$ �

10

Page 11: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsR

esid

uals

Reg

ress

ion

finds

best

line,

buti

sse

nsiti

veto

extr

eme

valu

es.

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min

ere

sidu

als.

R e

s i d

u a

l s o

f L

e a

s t

S q

u a

r e s

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g r e

s s

i o n

G E

O _

D S

T

4 0

0 3

0 0

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1

0 0

0

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. 3

0 . 0

- . 3

11

Page 12: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsS

PS

SP

lot

ofR

esid

uals

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s i d

u a

l s o

f L

e a

s t

S q

u a

r e s

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g r e

s s

i o n

G E

O _

D S

T

4 0

0 3

0 0

2 0 0

1

0 0

0

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. 3

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- . 3

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ere

sidu

als

asne

wva

riabl

e,th

engr

aph

vs.

orig

inal

� valu

e.

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chou

tfo

rex

trem

e

� valu

es—

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entia

l,th

ough

resi

dual

may

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all.

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exam

ple

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inM

oore

and

McC

abe.

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oex

amin

eO

UT

LIE

RS

—la

rge

resi

dual

s.

12

Page 13: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsLe

ast

Squ

ares

Reg

ress

ion

(opt

iona

l)

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does

regr

essi

onw

ork?

We

expr

ess

the

squa

red

resi

dual

sas

afu

nctio

nof

the

line.

Thi

sis

afu

nctio

nin

two

varia

bles

:

� ,the

inte

rcep

t,an

d

� ,the

slop

e.

%! �'&�"� �� �

� ! � � � "�

� !! �

�� � "� "�

� ! �

�� � �( "�

� �

� �) ��� ) ��( ���� �)� � �( ��( �

Tom

inim

ize

this

func

tion,

find

whe

reits

deriv

ativ

e

%*�# .

13

Page 14: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsLe

ast

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ares

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ress

ion

%! �'&�"� �

� �) ��� ) ��( ���� �)� � �( ��( �

Tom

inim

ize

afu

nctio

nin

two

varia

bles

,loo

kat

part

iald

eriv

ativ

esin

%,+* ,

%�-*

%.+* ! �'&�"� ) �

�)�� ) �

%�-* ! �'&�"� ) ��

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then

sete

ach

part

iald

eriv

ativ

eto

zero

,and

solv

e(t

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irof

linea

req

uatio

ns).

14

Page 15: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsR

egre

ssio

n—T

iny

Exa

mpl

e

Dia

lect

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rP

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t.G

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ist.

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elo/

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rlem

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elo/

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krad

e

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krad

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oode

scho

ol

� ����

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�)�� ) �

�) ��)�! �##")# ��/�

) ��)�! )##")� ��/�

) ��)�! 0##")� �)1

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Page 16: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsR

egre

ssio

n—T

iny

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ese

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req

uatio

ns(s

etto

zero

).

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Page 17: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Sta

tsE

xam

ple

,Con

t.

��# �0)�# �##03� �

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g r e

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i o n

w i t

h 3

C a

s e

s

G E

O _

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T X

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0 0

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1 . 0

. 9

. 8

. 7

. 6

. 5

17

Page 18: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsE

xam

ple

,Con

t.

**

MULTIP

LE

REGR

ESSION

**

Equation

Number1

DependentVariable..

PH_DISTX

Variable(s)

Entered

onStepNumber

1..

GEO_DSTX

-----------

Variables

intheEquation

----------

Variable

BSE

B

GEO_DSTX

.003450

.001472

(Constant)

.320000

.318041

18

Page 19: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsLi

near

Reg

ress

ion

Asy

mm

etri

c—ap

prop

riat

ew

hen

one

varia

ble

mig

htbe

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lain

ed”

bya

seco

nd–

Rea

ctio

ntim

eon

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culty

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gativ

e!–

Chi

ld’s

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tyon

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ain

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RE

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ric

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icte

ach

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wer

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ww

elld

oes

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ain

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ssio

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ate

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est

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ight

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mat

ions

).

19

Page 20: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsC

orre

latio

nC

oeffi

cien

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rson

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veco

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atio

n

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ectn

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ive

corr

elat

ion

none

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ary

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ce!

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tyco

rrel

ate—

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ton

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Page 21: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Inf.

Sta

tsC

orre

latio

nC

oeffi

cien

t

--

Correlation

Coefficients

--

GEO_DST

PHON_DST

GEO_DST

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.6584

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ogra

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Page 22: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 23: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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23

Page 24: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 26: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 27: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 28: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 29: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 30: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

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Page 31: Stats Inf - University of Groningennerbonne/teach/rema-stats-meth...geog r aphic distance, and cases (here, each pair is a separ ate C A S E). 3. Inf. Stats Scatterplots One useful

K LInf. Stats

Next: Multiple Regression

M31


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