( ( As ( grade increased ) ) ( , ( ( the ( scale scores ) ) ( ( had ( ( ( decreasing ( ( ( standard deviations ) and ) ( ( corresponding ( decreasing ( standard errors ) ) ) ( of measurement ) ) ) ) and ) ( increasing ( ( item - ) discriminations ) ) ) ) ... ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NN grade)) (VP (VBD increased)))) (, ,) (NP (DT the) (NN scale) (NNS scores)) (VP (VBD had) (S (VP (VP (VBG decreasing) (NP (NP (JJ standard) (NNS deviations)) (CC and) (NP (NP (JJ corresponding) (VBG decreasing) (JJ standard) (NNS errors)) (PP (IN of) (NP (NN measurement)))))) (CC and) (VP (VBG increasing) (NP (NP (NN item)) (: -) (NP (NNS discriminations))))))) (: ...)))
As grade increased, the scale scores had decreasing standard deviations and corresponding decreasing standard errors of measurement and increasing item- discriminations....
(ROOT (S (NP (PRP You)) (ADVP (NP (NP (NN decrease) (NNS errors)) (PP (IN in) (NP (DT an) (NN experiment)))) (IN by)) (VP (VBP take) (NP (JJ many) (NNS measurements))) (. .)))