( ( ( ( ( ( Some physicians ) ( have ( indicated ( that ( ( ( 25 % ) ( of ( such tests ) ) ) ( ( ( are negative ) , ) ( when ( they ( should ( be positive ) ) ) ) ) ) ) ) ) ) , ) and ) ( ( 25 % ) ( are ( positive ( when ( they ( should ( be negative ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT Some) (NNS physicians)) (VP (VBP have) (VP (VBN indicated) (SBAR (IN that) (S (NP (NP (CD 25) (NN %)) (PP (IN of) (NP (JJ such) (NNS tests)))) (VP (VBP are) (ADJP (JJ negative)) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (MD should) (VP (VB be) (ADJP (JJ positive)))))))))))) (, ,) (CC and) (S (NP (CD 25) (NN %)) (VP (VBP are) (ADJP (JJ positive) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (MD should) (VP (VB be) (ADJP (JJ negative))))))))) (. .)))
Some physicians have indicated that 25% of such tests are negative, when they should be positive, and 25% are positive when they should be negative.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT an) (JJ incorrect) (NN test) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive) (NP (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADJP (JJ false) (JJ negative))))))))))) (. .)))