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Provedor de dados:  AgEcon
País:  United States
Título:  Generalized power calculations for generalized linear models and more
Autores:  Newson, Roger
Data:  2011-10-05
Ano:  2004
Palavras-chave:  Powercal
Significance level
Detectable difference
Detectable ratio
Sample number
Standard deviation
Influence function
Sample design
Generalized linear model
Arithmetic mean
Algebraic mean
Geometric mean
Research Methods/ Statistical Methods
Resumo:  The powercal command can compute any one of the five quantities involved in power calculations from the other four. These quantities are power, significance level, detectable difference, sample number, and the standard deviation (SD) of the influence function, which is equal to the standard error multiplied by the square root of the sample number. powercal can take arbitrary expressions (involving constants, scalars, or variables) as input and calculate the output as a new variable. The user can therefore plot input variables against output variables, and this often communicates the tradeoffs involved better than a point calculation as output by the sampsi command. General formulas are given for calculating the SD of the influence function when the detectable difference is a linear combination of link functions of subpopulation means for an outcome variable distributed according to a generalized linear model (GLM). This general case includes a very broad range of special cases, where the parameters to be estimated are differences between subpopulation proportions, arithmetic means and algebraic means, or ratios between subpopulation proportions, arithmetic means, geometric means, and odds. However, powercal is not limited to GLMs and can even be used with rank methods.
Tipo:  Journal Article
Idioma:  Inglês
Identificador:  st0074
Relação:  Stata Journal>Volume 4, Number 4, 4th Quarter 2004
Formato:  23

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