sum_w2 - SUMMARY OF WEEK 2 [STAT4610 Applied Regression...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
SUMMARY!OF!WEEK!2 ! [ STAT4610!Applied!Regression!Analysis ] 1 FALL!10,!DR.!NEDRET!BILLOR|!!Auburn!University! CHAPTER!1!! ! A) Covariance!and!Correlation!! ! !Descriptive!Measures!for!Association!Between !Two!Quantitative!Variables! ! ! ! Covariance:!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!! !!!!!!!!!!!!!! !!!!!!!!!!!!!!! !!!depends!on!the!units!of!m easurement!!for!X!and!Y!!! ! ! ! Correlation :!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!! !!!!!!!!unitless, !and!Always!! $1! ± !!r xy !! ± 1!,!! ! ! s x :!standard!deviation!of!X! s y :!standard!deviation!of!Y! ! If!r xy !=1! ² !perfect!POSITIVE!! linear !relationship!! !!If!r xy !=$1! ² !perfect!NEGATIVE!! linear !relationship!! ! Correlation!!vs.!Regression! ! a)!r xy! is!only!a!measure!of!direction!and!strength!of !linear!relationships,!can !not!be!used!for! prediction!purposes.!Regression!analysis!can!be!used!for!prediction.! b)!r xy! measures!only!pairwise!relationships.!Regression!analysis!can !be!used!to!relate!one!or!more!response! variable!to!one!or!more!predictor!variables.! ! B)Simple!Linear!Regression!(SLR)!Model! ! i) Formal!Statement!of!SLR!Model ! Y i! =!# 0! +!# 1! X i +!" i! ,!i=1,2,….,n! (Linear!in!parameters,!linear!in!predictor!(1st!order!model)!
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

sum_w2 - SUMMARY OF WEEK 2 [STAT4610 Applied Regression...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online