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Verweise |
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Autor |
Shoesmith, E. |
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Titel |
A comparison of methods for estimating mean fecundity |
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Zeitschrift, Artikel |
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Jahr |
1990 |
Publikation |
J. FISH BIOL. |
Kurztitel der Zeitschrift |
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36 |
Ausgabe |
1 |
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Schlüsselwörter |
LÄngenfrequenz, normalverteilung, methode, theorie, mathematik, vergleich, statistik |
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Zusammenfassung |
This paper is concerned with certain computational aspects of estimating the mean fecundity of a single age-class of a population of fish. Four computational methods for estimating mean fecundity are compared by Monte Carlo simulation. One of the four methods is the simple expedient of estimating fecundity at sample mean length, a method known to be downwardly biased. The Monte Carlo study shows that the other three methods reduce bias and provide worthwhile efficiency gains. For small samples, the most efficient of the four methods is a “bias adjustment”, proposed here, that uses easily calculated sample statistics. For large samples, a numerical integration method has the highest efficiency. The fourth method, a “direct summation” procedure which can be done easily in many statistical or spreadsheet programs, performs well for all sample sizes. |
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Rufnummer |
212 |
Signatur  |
2100 |
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Autor |
Gayanilo, F. C.; Soriano, M.; Pauly, D. |
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Titel |
A Draft Gruide to the Compleat ELEFAN |
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Zeitschrift, Artikel |
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Jahr |
1988 |
Publikation |
International Center for Living Aquatic Resources Management |
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62 |
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Schlüsselwörter |
Fischerei, statistik, software, dokumentation, methode |
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Rufnummer |
211 |
Signatur |
2099 |
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Autor |
Misra, R. K. |
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Titel |
Statistical Comparisons of Several Growth Curves of the von Bertalanffy Type |
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Zeitschrift, Artikel |
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Jahr |
1980 |
Publikation |
Can. J. Fish. Aquat. Sci. |
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37 |
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920-926 |
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Schlüsselwörter |
Wachstum, theorie, vergleich, mathematik, statistik, modell |
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Rufnummer |
210 |
Signatur |
2098 |
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Autor |
Kaufmann, K. W. |
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Titel |
Fitting and Using Growth Curves |
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Zeitschrift, Artikel |
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Jahr |
1981 |
Publikation |
Oecologia |
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49 |
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293-299 |
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Schlüsselwörter |
Wachstum, methode, vergleich, statistik, modell |
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Rufnummer |
209 |
Signatur |
2097 |
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Autor |
Cryer, M.; Peirson, G.; Townsend, C. R. |
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Titel |
Reciprocal interactions between roach, Rutilus rutilus, and zooplankton in a small lake: Prey dynamics and fish growth and recruitment |
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Jahr |
1986 |
Publikation |
LIMNOL. OCEANOGR. |
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31 |
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3 |
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Schlüsselwörter |
Population, wachstum, methode, nahrung, interaktion |
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Rufnummer |
208 |
Signatur |
2096 |
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Autor |
Akamine, T. |
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Titel |
Expansion of growth curves using a periodic function and BASIC programs by Marquardt's method |
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Zeitschrift, Artikel |
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Jahr |
1986 |
Publikation |
Bull. Japan Sea Reg. Fish. Res. Lab. Nissuiken Hokoku |
Kurztitel der Zeitschrift |
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Ausgabe |
36 |
Seiten |
77-107 |
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Schlüsselwörter |
Wachstum, modell, methode, listing, basic, fischerei, statistik, algorithmus |
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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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Autor |
Akamine, T. |
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Titel |
Estimation of parameter for Richards model |
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Zeitschrift, Artikel |
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Jahr |
1988 |
Publikation |
Bull. Japan Sea Reg. Fish. Res. Lab. Nissuiken Hokoku |
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Ausgabe |
38 |
Seiten |
187-200 |
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Schlüsselwörter |
Wachstum, theorie, methode, statistik, listing, basic, modell |
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Zusammenfassung |
Akamine's (1986) BASIC program by Marquardt's method was rewritten for Richards model and its expanded model by the periodic function. For 0.9 similar to 1.1 the “LOG” function is corrected by Taylor series. Data estimated to be negative are cut off. AIC judges the effect of adding n to the parameters. Richards model is not so important in practice but it is important theoretically. |
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Rufnummer |
206 |
Signatur |
2094 |
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Autor |
Akamine, T. |
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Titel |
Consideration of the BASIC programs to analyse the polymodal frequency distribution into normal distributions |
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Zeitschrift, Artikel |
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Jahr |
1985 |
Publikation |
Bull. Japan Sea. Reg. Fish. Res. Lab. Nissuiken Hokoku |
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35 |
Seiten |
129-150 |
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Schlüsselwörter |
LÄngenfrequenz, methode, fischerei, basic, listing, statistik, mathematik, normalverteilung, modell, algorithmus |
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Zusammenfassung |
BASIC programs to analyse the polymodal frequency distribution into normal distributions were studied and a Maximum-Likelihood program was compared with a Least-Squares program and its variations. The Maximum-Likehood method is the most suitable procedure for the problem. The X super(2) minimum method is more suitable than the Least-Squares method for normal data, but the latter is more suitable than the former for abnormal data which have a few separate parts at the end of a distribution. These methods are easy to apply for a good estimation. Parameters are stable where an obvious minimal value is recognized between neighboring distributions, but the confidence intervals of the parameters are larger than for the parts where it is not recognized. |
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205 |
Signatur |
2093 |
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Autor |
Akamine, T. |
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Titel |
Comparison of Algorithms of Several Methods for Estimating Parameters of a Mixture of Normal Distributions |
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Zeitschrift, Artikel |
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Jahr |
1987 |
Publikation |
Bull. Jap. Sea Reg. Fish. Res. Lab |
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37 |
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Seiten |
259-277 |
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Schlüsselwörter |
Normalverteilung, modell, lÄngenfrequenz, vergleich, methode, listing, basic, statistik, fischerei, algorithmus |
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Rufnummer |
203 |
Signatur |
2092 |
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Autor |
Yamagishi, H.; Ishioka, K. |
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Titel |
Simulation study on the growth variation of fish with special reference to the sexual dimorphism in growth |
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Zeitschrift, Artikel |
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Jahr |
1989 |
Publikation |
Bull. Tokai Reg. Fish. Res. Lab. Tokaisuikenho. |
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127 |
Seiten |
1-16 |
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Schlüsselwörter |
Sex, wachstum, simulation, methode, theorie, mathematik, statistik |
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Zusammenfassung |
With respect to the sexual dimorphism in growth of fish, computer simulation of individual growth variation was made in terms of coefficient of variation (CV) and skewness (sk) of frequency distribution. Normal distributions of initial body length, specific growth rate in exponential growth coefficient in asymptotic growth and asymptotic value (each consisting of 500 monosexual distributions) were supposed. In exponential growth both CV and sk of the bisexual distributions increased more quickly than the two monosexual distributions. In asymptotic growth (Bertalanffy and Logistic) CV of the bisexual distribution was always greater than the monosexual distributions, and sk of the former was greater in positive value and smaller in negative value than those of the latter all the time. |
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Rufnummer |
202 |
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2091 |
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