dataset = salinity
begin description 
salinty data  from  Rousseeuw and Leroy p. 82
Y is salinity, x1 ia lagged salinity, x2 is trend, and x3 is the
volume of river discharge
it seems that the textbook's x1 has some typo's in it             
observations 1, 4, 8, 9, 10, 11, 16, 23 and 24 are lms outliers
least squares coefs:
      int      x1        x2          x3
  9.590239 0.7771027 -0.02551128 -0.2950337
end description
begin variables
Col 0 = Obs
Col 1 = y = salinity
Col 2 = x1 = laggedsalinity
Col 3 = x2 = trend
Col 4 = x3 = volume
end variables
begin data
 1  7.6  8.2    4 23.005
 2  7.7  7.6    5 23.873
 3  4.3  4.6    0 26.417
 4  5.9  4.3    1 24.868
 5  5.0  5.9    2 29.895
 6  6.5  5.0    3 24.200
 7  8.3  6.5    4 23.215
 8  8.2  8.3    5 21.862
 9 13.2 10.1    0 22.274
10 12.6 13.2    1 23.830
11 10.4 12.6    2 25.144
12 10.8 10.4    3 22.430
13 13.1 10.8    4 21.785
14 12.3 13.1    5 22.380
15 10.4 13.3    0 23.927
16 10.5 10.4    1 33.443
17  7.7 10.5    2 24.859
18  9.5  7.7    3 22.686
19 12.0 10.0    0 21.789
20 12.6 12.0    1 22.041
21 13.6 12.1    4 21.033
22 14.1 13.6    5 21.005
23 13.5 15.0    0 25.865
24 11.5 13.5    1 26.290
25 12.0 11.5    2 22.932
26 13.0 12.0    3 21.313
27 14.1 13.0    4 20.769
28 15.1 14.1    5 21.393