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48                Compact numerical methods for computers
                            some analysis or prediction. To underline the difficulty of this task, merely
                            consider the alternative model
                                                    income = x  + x  (phosphate)               (3.53)
                                                              1
                                                                  3
                            for which the singular values are computed as 1471·19 and 0·87188, again quite
                                                                                          2
                            collinear. The solutions are (e) and (f) in table 3.2 and the values of R  speak for
                            themselves.
                              A sample driver program DR0102.PAS is included on the program diskette.
                            Appendix 4 describes the sample driver programs and supporting procedures and
                            functions.
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