y2 ch1 - regression and correlation Flashcards
1
Q
why is extrapolation unreliable
A
as the trend may not continue outside the given range
2
Q
what is the product moment correlation coefficient (pmcc)
A
- denoted by r
- describes the linear correlation between 2 variables
- can take values from -1 to 1
3
Q
pmcc numbers
A
- 1 is perfectly negative linear correlation
1 is a perfectly positive linear correlation
