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Autor  |
Castro, M.; Erzini, K. |
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Titel |
Comparison of two length-frequency based packages for estimating growth and mortality parameters using simulated samples with varying recruitment patterns |
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Jahr |
1988 |
Publikation |
FISH. BULL. |
Kurztitel der Zeitschrift |
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86 |
Ausgabe |
4 |
Seiten |
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Schlüsselwörter |
Methode, wachstum, mortalitÄt, lÄngenfrequenz, vergleich, statistik, fisch |
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Zusammenfassung |
Length-frequency distributions were simulated for species with recruitment patterns characteristic of many tropical fish: 1) one recruitment peak per year, fast growth and very high mortality, 2) one recruitment peak per year, slow growth and moderate to high mortality 3) two recruitment peaks per year, slow growth and moderate to high mortality, and 4) random recruitment, slow growth and moderate to high mortality. Two microcomputer program packages – one incorporating the ELEFAN I & II programs and the other implementing a form of Modal Progression Analysis – were used to estimate growth and mortality parameters, and these were compared with the initial parameters used to generate the simulated samples. The results, while generally encouraging, suggest that multiple recruitments per year make it difficult to estimate growth and mortality parameters using these two packages. |
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nein |
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Rufnummer |
188 |
Signatur |
2077 |
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Autor |
Dahlberg, M. L. |
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Titel |
Computer program for analysis of the homogeneity and goodness of fit of frequency distributions, FORTRAN 4 |
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Zeitschrift, Artikel |
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Jahr |
1978 |
Publikation |
Fish. Bull. |
Kurztitel der Zeitschrift |
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76 |
Ausgabe |
1 |
Seiten |
285 |
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Schlüsselwörter |
computer-programmes; population-structure |
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Zusammenfassung |
A computer program was developed which forms frequency distributions from length measurements and then calculates a chi-square statistic which is used to test the homogeneity of the frequencies for the purpose of pooling. Output includes listing of arithmetic mean, variance, standard deviation, standard error of the mean, total sample size, and chi-square statistic of goodness of fit for individual groups and for the pooled frequency distribution. Histograms of all frequency distributions are produced as full-page printer charts, scaled if necessary to 50 units by up to 100 class intervals. The pooled frequencies and class midpoints are punched on cards to facilitate additional analyses. The program was developed on an IBM 360/65 OS System and required 56,811 bytes of storage. |
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321 |
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