It is important to make sure that we are working with only the complete data; otherwise we have to have a model for the missing values.

[Minitab:] Select Copy > Columns to Columns. . . from the Data menu. Enter c1-c7 in the Copy from columns: text box. Click on the Subset the data... button. Click on the Specify rows to include and Rows that match radio buttons. Click on the Condition. . . button. Enter the following condition into the Condition text box:

The nrow function will tell you how many (complete) cases are left in the data after the subsetting operation.

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bwt 999 And gestation 999 And parity 9 And height 99 And weight 999 And smoke 9 Finally click OK on each of the three dialogue boxes. This will produce a new worksheet with the 1,175 complete cases. [R:] Type bw.df = subset (bw.df, bwt != 999 & gestation != 999 & parity != 9 & height != 99 & weight! 999 & smoke != 9) nrow(bw.df)