Regression Problems / Mediation

Question 1

Mediation concept

Answer 1

How does the effect of core PV on OV take place? Is this relation there only because of the mediator?

Question 2

Moderation vs mediation

Answer 2

Mod: effect of PV on OV different for different levels of ModV?
Med: is the relation there only because of MedV?

Question 3

Assumptions / requirements of regression

Answer 3

1) independence of sample
2) linear relationship between OV and PV
3) no influential outliers
4) homoscedasticity (error variances the same)
5) no multicollinearity
6) normality

Question 4

Multicollinearity

Answer 4

Presence of correlation among PVs
PVs no totally independent

Question 5

Rule of tolerance statistic

Answer 5

Must be GREATER > than 0.20

Question 6

Variance Inflation Factor (VIF) rule

Answer 6

Must be LESS < than 5

Question 7

Why create dummy variables?

Answer 7

SPSS treats categorical variables as numerical
Create dummies

Question 8

Recode these codes:
Dutch = 0
German = 1
English = 2

Answer 8

Recoded:
Dutch = German (0), English (0)
German = German (1), English (0)
English = German (0), English (1)

Question 9

Total effect

Answer 9

C - path
Effect of PV on OV

Question 10

A - path

Answer 10

Effect of PV on MedV

Question 11

B - path

Answer 11

Effect of MedV on OV

Question 12

Direct effect

Answer 12

C’ - path
Remaining effect of PV on OV

Question 13

Indirect effect

Answer 13

A x b

Question 14

Partial mediation

Answer 14

Both direct and indirect

Question 15

Full mediation

Answer 15

Only indirect effect