Model yields an estimate of the percentage change in a household's demand for postage as a result of owning a computer
( Model ( ( yields ( ( an estimate ) ( of ( ( the ( percentage change ) ) ( in ( ( ( a ( household 's ) ) demand ) ( for postage ) ) ) ) ) ) ) ( as ( ( a result ) ( of ( owning ( a computer ) ) ) ) ) ) )
(ROOT (S (NP (NNP Model)) (VP (VBZ yields) (NP (NP (DT an) (NN estimate)) (PP (IN of) (NP (NP (DT the) (NN percentage) (NN change)) (PP (IN in) (NP (NP (NP (DT a) (NN household) (POS 's)) (NN demand)) (PP (IN for) (NP (NN postage)))))))) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (S (VP (VBG owning) (NP (DT a) (NN computer))))))))))
Owning a computer doesn't change the usage of postage for a household.
( ( Owning ( a computer ) ) ( ( ( does n't ) ( ( change ( ( the usage ) ( of postage ) ) ) ( for ( a household ) ) ) ) . ) )
(ROOT (S (S (VP (VBG Owning) (NP (DT a) (NN computer)))) (VP (VBZ does) (RB n't) (VP (VB change) (NP (NP (DT the) (NN usage)) (PP (IN of) (NP (NN postage)))) (PP (IN for) (NP (DT a) (NN household))))) (. .)))