That is because you have 47.1 at the last record.
DATA MUSSELS;
INPUT Y X;
YB = -LOG(47.1 - Y);
CARDS;
29.2 4
28.6 4
29.4 5
33.0 5
28.2 6
33.9 6
33.1 6
33.2 7
31.4 7
37.8 7
36.9 8
40.2 8
39.2 9
40.6 9
35.2 10
43.3 10
42.3 13
41.4 13
45.2 14
47.1 18
;
LOG(47.1-47.1) ==> LOG(0) ,that is not right, it should be greater than zero.
You need to change it.
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