3. Simple linear regression Flashcards
What is a recursive model?
A path diagram where all arrows go in one direction
What are two types of recursive models?
saturated
unsaturated
What does a saturated path model include?
All possible paths
Is not parsimonious (everything is explored - not simple)
What does a unsaturated path model include?
Only some causal paths
What are non-recursive models analysed using?
SEM
or
Two stage least squares regression
What is the difference between recursive and non-recursive models?
Recursive (successive) Non Recursive (reciprocal)
What does it mean if Pearson r = 0?
No linear relationship
What does a large gap in a scattergram suggest?
2 different groups of scores
Calculation of Pearson r can be done on what sort of variables?
Interval
or
Dichotomous (point biserial correlation)
What is p hacking?
Using a one-tailed test to get a sig. result
What is the difference between correlation and regression?
Correlation: presence of relationship between X and Y (don’t know how much)
Regression: How much effect X has on Y
What is represented in an OLS regression?
the regression line (of best fit)
Which do you report out of r sq and adj r sq and why?
Adj R sq
It is a better estimate in population
What does the ANOVA table tell you?
The goodness of fit
SST is a sum of squared differences between the?
Observed values on DV
and
The mean
