The value of 100r
2is a measure of the percentage of the data that can
satisfactorily explained by the regression analysis. For example, a value of
r¼ 0 :90 indicates that 81 per cent of the results can be satisfactorily explained
by regression analysis using the parameters specified. It indicates that 19 per
cent of the data is not satisfactorily explained by these parameters and so
indicates that the use of an additional parameter(s) might give a more acceptable
account of the results. Suppose, for example, regression analysis using an extra
parameter gave a regression constant of 0.98. This shows that 96.04 per cent of
the data is now satisfactorily accounted for by the chosen parameters.
APPENDIX 6 REGRESSION ANALYSIS 251