By William Feller
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Extra resources for An introduction to probability theory and its applications
8 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 1 1 1 1 1 t 1 0 0 1 and we see that both 8, and 8, must be negative. Experience with exponential models suggests that what is important is to get the algebraic signs of the starting values of t$ and 8, correct and that, within reason, getting the correct magnitudes is not that important. Accordingly, take - 1 as the 32 UNIVARIATE NONLINEAR REGRESSION starting value of both e, and 0,. Again, experience indicates that the starting values for parameters that enter the model linearly such as 8, and 8, are almost irrelevant, within reason, so take zero as the starting value of S,.
Hence, there is a A, (8’ = 8, + A,D,l minimizing Q(8, + XDd over A,. Now 8‘ is either an interior point of S or a boundary eoint of S. 1 of Blackwell and Girshick (1954, p. 32) S and S have the same interior points and boundary points. In 8‘ were a boundary point of S , we would have Q s QV’) Q@,) c which is not possible. Then 8‘ is an interior point of S. Since 8,+, = 8’, we have established conclusion 1. We establish conclusions 2, 3. By construction 0 5 Q ( 8 , + , ) 5 Q(8,); hence Q(8,) -+ Q* as a + 00.
An appropriate question is how accurate are probability statements based on the asymptotic properties of nonlinear least squares estimators in applications. Specifically one might ask: How accurate are probability statements obtained by using the critical points of the r-distribution with n - p degrees of freedom to approximate the sampling distribution of Monte Carlo evidence on this point is presented below using Example 1. We shall accumulate such information as we progress. EXAMPLE I (Continued).