![]() |
![]() |
The MI Procedure |
The Fish data described in the STEPDISC procedure are measurements of 159 fish of seven species caught in Finland’s lake Laengelmavesi. For each fish, the length, height, and width are measured. Three different length measurements are recorded: from the nose of the fish to the beginning of its tail (Length1), from the nose to the notch of its tail (Length2), and from the nose to the end of its tail (Length3). See Chapter 82, The STEPDISC Procedure, for more information.
The Fish1 data set is constructed from the Fish data set and contains only one species of the fish and the three length measurements. Some values have been set to missing, and the resulting data set has a monotone missing pattern in the variables Length1, Length2, and Length3. The Fish1 data set is used in Example 54.2 with the propensity score method and in Example 54.3 with the regression method.
The Fish2 data set is also constructed from the Fish data set and contains two species of fish. Some values have been set to missing, and the resulting data set has a monotone missing pattern in the variables Length3, Height, Width, and Species. The Fish2 data set is used in Example 54.4 with the logistic regression method and in Example 54.5 with the discriminant function method. Note that some values of the variable Species have also been altered in the data set.
The FitMiss data set created in the section Getting Started: MI Procedure is used in other examples. The following statements create the Fish1 data set:
/*----------- Fish of Species Bream ----------*/ data Fish1; title 'Fish Measurement Data'; input Length1 Length2 Length3 @@; datalines; 23.2 25.4 30.0 24.0 26.3 31.2 23.9 26.5 31.1 26.3 29.0 33.5 26.5 29.0 . 26.8 29.7 34.7 26.8 . . 27.6 30.0 35.0 27.6 30.0 35.1 28.5 30.7 36.2 28.4 31.0 36.2 28.7 . . 29.1 31.5 . 29.5 32.0 37.3 29.4 32.0 37.2 29.4 32.0 37.2 30.4 33.0 38.3 30.4 33.0 38.5 30.9 33.5 38.6 31.0 33.5 38.7 31.3 34.0 39.5 31.4 34.0 39.2 31.5 34.5 . 31.8 35.0 40.6 31.9 35.0 40.5 31.8 35.0 40.9 32.0 35.0 40.6 32.7 36.0 41.5 32.8 36.0 41.6 33.5 37.0 42.6 35.0 38.5 44.1 35.0 38.5 44.0 36.2 39.5 45.3 37.4 41.0 45.9 38.0 41.0 46.5 ;
The Fish2 data set contains two of the seven species in the Fish data set. For each of the two species (Bream and Roach), the length from the nose of the fish to the end of its tail, the height, and the width of each fish are measured. The height and width are recorded as percentages of the length variable.
The following statements create the Fish2 data set:
/*-------- Fish of Species Bream and Roach --------*/ data Fish2 (drop=HtPct WidthPct); title 'Fish Measurement Data'; input Species $ Length3 HtPct WidthPct @@; Height= HtPct*Length3/100; Width= WidthPct*Length3/100; datalines; Gp1 30.0 38.4 13.4 Gp1 31.2 40.0 13.8 Gp1 31.1 39.8 15.1 . 33.5 38.0 . . 34.0 36.6 15.1 Gp1 34.7 39.2 14.2 Gp1 34.5 41.1 15.3 Gp1 35.0 36.2 13.4 Gp1 35.1 39.9 13.8 . 36.2 39.3 13.7 Gp1 36.2 39.4 14.1 . 36.2 39.7 13.3 Gp1 36.4 37.8 12.0 . 37.3 37.3 13.6 Gp1 37.2 40.2 13.9 Gp1 37.2 41.5 15.0 Gp1 38.3 38.8 13.8 Gp1 38.5 38.8 13.5 Gp1 38.6 40.5 13.3 Gp1 38.7 37.4 14.8 Gp1 39.5 38.3 14.1 Gp1 39.2 40.8 13.7 . 39.7 39.1 . Gp1 40.6 38.1 15.1 Gp1 40.5 40.1 13.8 Gp1 40.9 40.0 14.8 Gp1 40.6 40.3 15.0 Gp1 41.5 39.8 14.1 Gp2 41.6 40.6 14.9 Gp1 42.6 44.5 15.5 Gp1 44.1 40.9 14.3 Gp1 44.0 41.1 14.3 Gp1 45.3 41.4 14.9 Gp1 45.9 40.6 14.7 Gp1 46.5 37.9 13.7 Gp2 16.2 25.6 14.0 Gp2 20.3 26.1 13.9 Gp2 21.2 26.3 13.7 Gp2 22.2 25.3 14.3 Gp2 22.2 28.0 16.1 Gp2 22.8 28.4 14.7 Gp2 23.1 26.7 14.7 . 23.7 25.8 13.9 Gp2 24.7 23.5 15.2 Gp2 24.3 27.3 14.6 Gp2 25.3 27.8 15.1 Gp2 25.0 26.2 13.3 Gp2 25.0 25.6 15.2 Gp2 27.2 27.7 14.1 Gp2 26.7 25.9 13.6 . 26.8 27.6 15.4 Gp2 27.9 25.4 14.0 Gp2 29.2 30.4 15.4 Gp2 30.6 28.0 15.6 Gp2 35.0 27.1 15.3 ;
![]() |
![]() |
Copyright © 2009 by SAS Institute Inc., Cary, NC, USA. All rights reserved.