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st: weird ROC curve


From   Arnold Kester <arnold.kester@stat.unimaas.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: weird ROC curve
Date   06 Dec 2002 12:20:41 +0100

Dear listers,

I just produced the weirdest ROC curve I've ever seen, and I suspect
there's a bug in roctab. The curve jumps up and down which is by
definition not possible. For your amusement and curiosity I append the
data. I am aware that as a diagnostic, x is worthless to predict y.

what I did was

insheet using roc_data.out
roctab y x, graph

Thanks,
Arnold Kester

----------- roc_data.out ------------
y	x
0	7
0	81
0	7
0	36
0	7
0	207
0	7
0	6
0	2
0	19
0	94
0	213
0	66
0	60
0	130
0	131
0	30
0	111
0	18
0	9
0	210
0	16
0	87
0	30
0	154
0	18
0	8
0	212
0	106
0	108
0	176
0	87
0	207
0	23
0	50
0	20
0	22.5
0	143
0	37
0	130
0	70
0	17
0	10
0	7
0	134
0	134
0	51
0	2
0	19
1	30
1	114
1	35
1	6
1	2
1	2
1	20
1	58
1	14
1	12
1	26
1	140
1	13
1	255
1	6
1	18
1	234
1	128
1	9
1	161
1	100
1	16
1	18
1	48
1	225
1	50
1	91
1	41
1	7
1	82
1	22
1	10
1	312
1	22.5
1	6
1	145
1	122
1	228
1	9
1	6
1	34
1	85
1	24
1	11
1	93
1	57
1	178
1	134
1	7
1	128
1	88
1	95
1	119
1	2
1	14
1	171
1	216
1	79
1	96
1	17
1	6
1	8
1	6



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