Even after controlling for the independent effects of firm size, product mix, and distribution channel on performance, we found that the most innovative firms were significantly more profitable than those that had adopted fewer of the key practices.
( ( Even ( after ( ( controlling ( for ( ( the ( independent effects ) ) ( of ( ( ( ( ( ( firm size ) , ) ( product mix ) ) , ) and ) ( distribution channel ) ) ) ) ) ) ( on performance ) ) ) ) ( , ( we ( ( found ( that ( ( the ( most ( innovative firms ) ) ) ( ( were ( significantly ( more profitable ) ) ) ( than ( those ( that ( had ( adopted ( fewer ( of ( the ( key practices ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (RB Even) (IN after) (S (VP (VBG controlling) (PP (IN for) (NP (NP (DT the) (JJ independent) (NNS effects)) (PP (IN of) (NP (NP (NN firm) (NN size)) (, ,) (NP (NN product) (NN mix)) (, ,) (CC and) (NP (NN distribution) (NN channel)))))) (PP (IN on) (NP (NN performance)))))) (, ,) (NP (PRP we)) (VP (VBD found) (SBAR (IN that) (S (NP (DT the) (RBS most) (JJ innovative) (NNS firms)) (VP (VBD were) (ADJP (RB significantly) (RBR more) (JJ profitable)) (PP (IN than) (NP (NP (DT those)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (VP (VBN adopted) (NP (NP (JJR fewer)) (PP (IN of) (NP (DT the) (JJ key) (NNS practices)))))))))))))) (. .)))
Firms track a number of control variables to measure performance.
( Firms ( ( track ( ( ( a number ) ( of ( control variables ) ) ) ( to ( measure performance ) ) ) ) . ) )
(ROOT (S (NP (NNS Firms)) (VP (VBP track) (S (NP (NP (DT a) (NN number)) (PP (IN of) (NP (NN control) (NNS variables)))) (VP (TO to) (VP (VB measure) (NP (NN performance)))))) (. .)))