( Rarely ( , ( ( a ( test result ) ) ( ( is ( neither ( ( negative nor ) positive ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Rarely)) (, ,) (NP (DT a) (NN test) (NN result)) (VP (VBZ is) (ADJP (DT neither) (JJ negative) (CC nor) (JJ positive))) (. .)))
Rarely, a test result is neither negative nor positive.
(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))))))))))) (. .)))