answers2009final

answers2009final - Answer key for the final in 2009 1.) a.)...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

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

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

Unformatted text preview: Answer key for the final in 2009 1.) a.) v b.) v-vi c.) v-vi d.) vii e.) none f.) none 2.) a.) = T t =1 x t x t- 1 T t =1 x t y t for x t = (1 ,x t ) . b.) = S xy /S xx c.) T X t =1 e 2 t = T X t =1 [( y t- y )- ( x t- x )] 2 = T X t =1 ( y t- y ) 2 + T X t =1 2 ( x t- x ) 2- 2 T X t =1 ( x t- x )( y t- y ) T- 1 T X t =1 e 2 t = S yy + S 2 xy S 2 xx S xx- 2 S 2 xy S xx = S yy- S 2 xy S xx Therefore, R 2 = 1- S yy- S 2 xy S xx S yy = 1- 1 + S 2 xy S xx S yy = r 2 xy d.) F = 2 TS xx s 2 = TS 2 xy S xx ( S yy- S 2 xy /S xx ) T T- 2 = ( T- 2) S 2 xy S xx S yy- S 2 xy 1 e.) F = ( T- 2) 1- 1 + S xx S yy S 2 xy = ( T- 2) 1- 1 + 1 /R 2 = ( T- 2) R 2 1- R 2 3.) a.) Factors in i such as an economic shock might be positively corre- lated with s i . This is expected to result in 2 being biased upward because if cov ( s i , i ) > 2 = 2 + n i =1 ( s i- s )( i- ) n i =1 ( s i- s ) 2...
View Full Document

Page1 / 3

answers2009final - Answer key for the final in 2009 1.) a.)...

This preview shows document pages 1 - 3. Sign up to view the full document.

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