Eintrag |
Autor |
Akamine, T. |
Titel |
Expansion of growth curves using a periodic function and BASIC programs by Marquardt's method |
Typ |
Zeitschrift, Artikel |
Jahr |
1986 |
Publikation |
Bull. Japan Sea Reg. Fish. Res. Lab. Nissuiken Hokoku |
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Ausgabe |
36 |
Seiten |
77-107 |
Schlüsselwörter |
Wachstum, modell, methode, listing, basic, fischerei, statistik, algorithmus |
Zusammenfassung |
The growth curves of von Bertalanffy, logistic and Gompertz models were expanded using a periodic function, f (t + 1) = f (t). Each model was expanded into l = l infinity (1-exph sub(1)), l = l infinity /(1 + exph sub(1)) and l = l infinity exp(-exph sub(1)) where h sub(1) = -K(F(t)-F(t sub(0))), F' = f, f = (1 + a)/2 + (1-a)/2 multiplied by cos 2 pi (t-t sub(1)) : a less than or equal to f less than or equal to 1. BASIC programs for each model were written by Marquardt's method. The following subjects were also considered : an expansion into another type, a parameter-error analysis, a comparison with the original model and with Walford's graphical method, and a calculation to determine the extreme points of the growth rate. This expansion of the growth curves is useful and the programs are easily applied to other curves. |
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Rufnummer |
207 |
Signatur |
2095 |
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