A ESCOLHA DO MÃƒÂ‰TODO ESTATÃƒÂSTICO - SBPqO

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“We have discussed the practice of using different data transformations within a 2-way ANOVA with our statistical adviser and he stated that this is not valid, since the comparisons are not then between data of the same type. Transformation is performed to deal with 1 or more of 3 problems: non-normality, non-homogeneity of variance and non-additivity. To my understanding, in a 2-way analysis, 'individualized' transformations, while solving the first two problems, would work against the third requirement of ANOVA, that treatment effects are additive. For instance, data in which treatment effect was multiplicative rather than additive are appropriately transformed to logs, since the treatment effects then become additive. But these could not then be compared with data that had not been transformed because they already fulfilled the ANOVA requirements. You would be comparing oranges and bananas.” “Sorry about the confusion induced by my last set of comments on the statistics. I think there might be still some sort of problem there, in that your comparison of the 30-min plaque solid data is on a somewhat different basis from the other comparisons. But I will discuss it when I next see our statistical advisor. I suspect that I put the question to him in a misleading way, combined with a misinterpretation of your analysis.” 46
Obrigada pela atenção!!! litenuta@fop.unicamp.br 47
Page 1 and 2: Universidade Estadual de Campinas F
Page 3 and 4: Figueira CV, 2006 Para outros...
Page 5 and 6: Testes estatísticos mais comuns N
Page 7 and 8: Estatística experimental Desminera
Page 9 and 10: Variação do acaso: toda variaçã
Page 11 and 12: Concentração de F no fluido do bi
Page 13 and 14: Transformação sugerida pelo pacot
Page 15 and 16: Controle 70 ppm F 140 ppm F 280 ppm
Page 17 and 18: “In relation to any experiment we
Page 19 and 20: Repetição Proporciona uma estimat
Page 21 and 22: Repetição n=3 Tratamento A: 20 24
Page 23 and 24: Delineamento inteiramente aleatoriz
Page 25 and 26: Aleatorização = sorteio! Aleatori
Page 27 and 28: Ao classificar por um número aleat
Page 29 and 30: Realizando-se a aleatorização sem
Page 31 and 32: Delineamento aleatorizado em blocos
Page 33 and 34: Delineamento aleatorizado em blocos
Page 35 and 36: Experimentos fatoriais Derivam do i
Page 37 and 38: Delineamento fatorial Hipóteses: (
Page 39 and 40: Variável resposta B1 B2 Interaçã
Page 41 and 42: Experimentos em parcelas subdividid
Page 43: Delineamento fatorial Esquema da an

A ESCOLHA DO MÃƒÂ‰TODO ESTATÃƒÂSTICO - SBPqO

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A ESCOLHA DO MÃƒÂ‰TODO ESTATÃƒÂSTICO - SBPqO