For many scientific fields, however, there is no central listing of all tenure-track faculty, making it difficult to define a rigorous sample frame for analysis.
1	For	for	ADP	IN	_	4	case	4:case	Discourse=adversative-antithesis:20->19:0
2	many	many	ADJ	JJ	Degree=Pos	4	amod	4:amod	Entity=(49-abstract-new-cf4-3-sgl
3	scientific	scientific	ADJ	JJ	Degree=Pos	4	amod	4:amod	_
4	fields	field	NOUN	NNS	Number=Plur	9	obl	9:obl:for	Entity=49)|SpaceAfter=No
5	,	,	PUNCT	,	_	4	punct	4:punct	_
6	however	however	ADV	RB	_	9	advmod	9:advmod	SpaceAfter=No
7	,	,	PUNCT	,	_	6	punct	6:punct	_
8	there	there	PRON	EX	PronType=Dem	9	expl	9:expl	_
9	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
10	no	no	DET	DT	Polarity=Neg|PronType=Art	12	det	12:det	_
11	central	central	ADJ	JJ	Degree=Pos	12	amod	12:amod	Entity=(50-abstract-new-cf2-2-sgl
12	listing	listing	NOUN	NN	Number=Sing	9	nsubj	9:nsubj	_
13	of	of	ADP	IN	_	18	case	18:case	_
14	all	all	DET	DT	PronType=Tot	18	det	18:det	Entity=(51-person-new-cf3-5-coref
15	tenure	tenure	NOUN	NN	Number=Sing	17	compound	17:compound	SpaceAfter=No|XML=<w>
16	-	-	PUNCT	HYPH	_	15	punct	15:punct	SpaceAfter=No
17	track	track	NOUN	NN	Number=Sing	18	compound	18:compound	XML=</w>
18	faculty	faculty	NOUN	NN	Number=Sing	12	nmod	12:nmod:of	Entity=51)50)|SpaceAfter=No
19	,	,	PUNCT	,	_	20	punct	20:punct	_
20	making	make	VERB	VBG	VerbForm=Ger	9	advcl	9:advcl	Discourse=causal-result:21->20:0
21	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	20	obj	20:obj|22:nsubj:xsubj	Entity=(52-event-new-cf1-1-cata)
22	difficult	difficult	ADJ	JJ	Degree=Pos	20	xcomp	20:xcomp	_
23	to	to	PART	TO	_	24	mark	24:mark	Entity=(52-event-acc:com-cf1-2-coref
24	define	define	VERB	VB	VerbForm=Inf	22	xcomp	22:xcomp	_
25	a	a	DET	DT	Definite=Ind|PronType=Art	28	det	28:det	Entity=(53-abstract-new-cf5-6-sgl
26	rigorous	rigorous	ADJ	JJ	Degree=Pos	28	amod	28:amod	_
27	sample	sample	NOUN	NN	Number=Sing	28	compound	28:compound	_
28	frame	frame	NOUN	NN	Number=Sing	24	obj	24:obj	_
29	for	for	ADP	IN	_	30	case	30:case	_
30	analysis	analysis	NOUN	NN	Number=Sing	24	obl	24:obl:for	Entity=(54-abstract-new-cf6-1-sgl)53)52)|SpaceAfter=No
31	.	.	PUNCT	.	_	9	punct	9:punct	_
