[R-br] Criação de data.frame com valores médios de variaveis

[Gilenio Borges Fernandes]

Prezados(as)


Tenho um banco de dados com as seguintes variáveis (colunas):

Tipo Trat Tempo Triplicata acidezKOH e acidezOLEIC

Segue o CMR com a estrutura do meu banco de dados:
d1=structure(list(Tipo = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L,
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L,
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("TI1", "TI2",
"TI3"), class = "factor"), Trat = structure(c(1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L,
3L, 3L, 3L, 3L, 3L, 3L, 3L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L,
3L, 3L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("TR1",
"TR2", "TR3"), class = "factor"), Tempo = c(0L, 0L, 0L, 3L, 3L,
3L, 6L, 6L, 6L, 0L, 0L, 0L, 3L, 3L, 3L, 6L, 6L, 6L, 0L, 0L, 0L,
3L, 3L, 3L, 6L, 6L, 6L, 0L, 0L, 0L, 3L, 3L, 3L, 6L, 6L, 6L, 0L,
0L, 0L, 3L, 3L, 3L, 6L, 6L, 6L, 0L, 0L, 0L, 3L, 3L, 3L, 6L, 6L,
6L, 0L, 0L, 0L, 3L, 3L, 3L, 6L, 6L, 6L, 0L, 0L, 0L, 3L, 3L, 3L,
6L, 6L, 6L, 0L, 0L, 0L, 3L, 3L, 3L, 6L, 6L, 6L), Triplicata = c(1L,
2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L,
3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L,
1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L,
2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L,
3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L
), acidezKOH = c(2.29, 2.29, 2.38, 6.16, 6.16, 5.92, 4.82, 5.04,
5.04, 3.37, 3.54, 3.69, 5.92, 5.92, 5.71, 5.8, 5.75, 5.72, 3.16,
3.02, 3.22, 5.33, 5.33, 5.3, 5.66, 5.75, 5.7, 0.23, 0.23, 0.23,
0.3, 0.3, 0.3, 0.34, 0.31, 0.31, 0.26, 0.29, 0.26, 0.33, 0.36,
0.33, 0.43, 0.4, 0.43, 0.26, 0.26, 0.29, 0.3, 0.33, 0.3, 0.34,
0.31, 0.31, 0.09, 0.09, 0.09, 0.33, 0.33, 0.33, 0.37, 0.37, 0.34,
0.14, 0.14, 0.14, 0.3, 0.3, 0.3, 0.31, 0.34, 0.34, 0.57, 0.57,
0.57, 0.33, 0.33, 0.33, 0.8, 0.77, 0.8), acidezOLEIC = c(1.15,
1.15, 1.2, 3.1, 3.1, 2.97, 2.42, 2.54, 2.54, 1.69, 1.78, 1.85,
2.98, 2.98, 2.87, 2.92, 2.89, 2.87, 1.59, 1.52, 1.62, 2.68, 2.68,
2.66, 2.85, 2.89, 2.86, 0.11, 0.11, 0.11, 0.15, 0.15, 0.15, 0.17,
0.16, 0.16, 0.13, 0.14, 0.13, 0.17, 0.18, 0.17, 0.22, 0.2, 0.21,
0.13, 0.13, 0.14, 0.15, 0.17, 0.15, 0.17, 0.16, 0.16, 0.04, 0.04,
0.04, 0.17, 0.17, 0.17, 0.19, 0.19, 0.17, 0.07, 0.07, 0.07, 0.15,
0.15, 0.15, 0.17, 0.16, 0.16, 0.29, 0.29, 0.29, 0.17, 0.17, 0.17,
0.4, 0.39, 0.4)), .Names = c("Tipo", "Trat", "Tempo", "Triplicata",
"acidezKOH", "acidezOLEIC"), class = "data.frame", row.names = c(NA,
-81L))


Preciso criar um banco de dados (data.frame) com as colunas: Tipo Trat
Tempo e mais as colunas acidezKOH e acidezOLEIC com a média das três
Triplicatas. Tentei fazer com a função tapply, mas, não resolve porque não
cria uma estrutura de data.frame. Gostaria de ter auxilio da lista para
este problema.

Desde já agradeço.

Cordialmente,
-- 
Gilenio Borges Fernandes
Professor Associado IV (Aposentado)
Universidade Federal da Bahia
Instituto de Matemática
Departamento de Estatística
Av. Adhemar de Barros, s/n – Ondina.
40.170-110 - Salvador - BA, Brasil
Tel.: (071)3283-6340/6341/6337  Fax:  (071)3283-6336
URL: http://lattes.cnpq.br/6764860618464860
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