Documentation for NWTS dataset with continuous covariate
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FIELD	VARIABLE	RANGE/CODES 	DESCRIPTION
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1	seqno		1-4088		Sequential ID number

2	instit		1 = Favorable	Histology assigned by
			2 = Unfavorable`institutional pathologist

3	histol		1 = Favorable	Histolology assigned by
			2 = Unfavorable	NWTS (central) pathologist

4	stage		1 = I		Stage of disease
			2 = II
			3 = III
			4 = IV

5	study		3 = NWTS-3	Study number
			4 = NWTS-4

6	rel		0 = No		Relapse indicator
			1 = Yes

7 	edrel		0 - 6209	Elapsed days from WT diagnosis
					to relapse or last report

8	age		0 - 191		Age (months) at WT diagnosis
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