There is uncertainty associated with all of the numbers presented in this paper due to sampling error and estimation error in econometric estimation procedure used to recover household-level demand functions
( There ( is ( uncertainty ( associated ( with ( all ( of ( ( the numbers ) ( presented ( in ( ( this paper ) ( due ( to ( ( sampling ( error ( and ( estimation error ) ) ) ) ( in ( ( econometric ( estimation procedure ) ) ( used ( to ( recover ( household-level ( demand functions ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (NN uncertainty)) (VP (VBN associated) (PP (IN with) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NNS numbers)) (VP (VBN presented) (PP (IN in) (NP (NP (DT this) (NN paper)) (ADJP (JJ due) (PP (TO to) (S (VP (VBG sampling) (NP (NN error) (CC and) (NN estimation) (NN error)) (PP (IN in) (NP (NP (JJ econometric) (NN estimation) (NN procedure)) (VP (VBN used) (S (VP (TO to) (VP (VB recover) (NP (JJ household-level) (NN demand) (NNS functions))))))))))))))))))))))))
Instead of sampling humans for this data, researchers sampled pet rocks.
( ( Instead ( of ( ( sampling humans ) ( for ( this data ) ) ) ) ) ( , ( researchers ( ( sampled ( pet rocks ) ) . ) ) ) )
(ROOT (S (PP (RB Instead) (IN of) (S (VP (VBG sampling) (NP (NNS humans)) (PP (IN for) (NP (DT this) (NNS data)))))) (, ,) (NP (NNS researchers)) (VP (VBN sampled) (NP (JJ pet) (NNS rocks))) (. .)))