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The paper discusses how Normal, Lognormal, and logPearson type 3 distributions were investigated as distributions for modelling atsite annual maximum flood flows using the Hazen, Weibull, and California plotting positions at OgunOshun river basin in Nigeria. All the probability distributions when matched with Weibull plotting position gave similar values near the center of the distribution but varied considerably in the tails. The Weibull plotting position when matched with Normal, Lognormal and Log Pearson Type III probability distributions gave the highest coefficient of determinations of 0.967, 0.987, and 0.986 respectively. Hazen plotting position gave minimal errors with the RMSE of 6.988, 6.390, and 6.011 for Normal, Lognormal, and... 

Palavraschave: Probability distributions; Plotting positions; Maximum flood; Estimation; Statistical modelling; Nigeria. 
Ano: 2011 
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1380 
 


Lorance, Pascal; Souissi, Sami; Uiblein, Franz. 
The catch from bottom longline stations sampled from a series of research cruises around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was analysed in terms of fish distribution, density and diversity. The distribution of the number of species and individuals caught per station appeared to fit well the Poisson and Exponential distribution function, respectively. In particular, the parameter of the Poisson's distribution appeared to provide an index of the point (at station scale) diversity, and its confidence interval, allowing for statistical comparisons. The relationships between point diversity, the alpha diversity (in the depth strata) and the beta diversity (along the depth gradient) were investigated. Around the islands, the density and... 
Tipo: Text 
Palavraschave: Canary Islands; Probability distributions; Density; Diversity; Demersal fishes; Longline. 
Ano: 2002 
URL: http://archimer.ifremer.fr/doc/2002/publication566.pdf 
 


Costa,Marilia Gregolin; Barbosa,José Carlos; Yamamoto,Pedro Takao; Leal,Renata Moreira. 
The psyllid Diaphorina citri Kuwayama is one of the most important pests of citrus, mainly because it is the vector of the bacterium that causes huanglongbing (HLB) or 'Greening' disease. To study the spatial distribution of nymphs and adults of this pest, an experiment was carried out in two 'Valencia' sweet orange orchards, four and 12 years of age, established in Matão, central area of São Paulo state, Brazil. The following dispersion indices were used to study pest aggregation in the citrus plants: variance/mean relationship (I), index of Morisita (Iδ), coefficient of Green (Cx), the <img border=0 width=16 height=16 src="../../../../../img/revistas/sa/v67n5/a08form10.gif" align=absmiddle>exponent of negative binomial distribution, common k... 
Tipo: Info:eurepo/semantics/article 
Palavraschave: Citrus sinensis; Psyllid; Probability distributions; Negative binomial distribution. 
Ano: 2010 
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S010390162010000500008 
 

 


