Note that the I/S standard deviations control for differences in firm size.
( ( Note ( that ( ( the ( I/S ( standard deviations ) ) ) ( control ( for ( differences ( in ( firm size ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (NN Note) (SBAR (IN that) (S (NP (DT the) (NNP I/S) (JJ standard) (NNS deviations)) (VP (VBP control) (PP (IN for) (NP (NP (NNS differences)) (PP (IN in) (NP (NN firm) (NN size))))))))) (. .)))
I/S standard deviations account for variety in firm size.
( ( I/S ( standard deviations ) ) ( ( account ( for ( variety ( in ( firm size ) ) ) ) ) . ) )
(ROOT (S (NP (NNP I/S) (NN standard) (NNS deviations)) (VP (VBP account) (PP (IN for) (NP (NP (NN variety)) (PP (IN in) (NP (NN firm) (NN size)))))) (. .)))