To whom it may concern: I am trying a factorial design a system of mine that has two factors. Each factor was set at four different levels, with one replication for each of the combinations. My data is as follows:
A B Response 1 600 2.5 0.0257 2 600 2.5 0.0254 3 600 5 0.0217 4 600 5 0.0204 5 600 10 0.0191 6 600 10 0.0210 7 600 20 0.0133 8 600 20 0.0139 9 800 2.5 0.0312 10 800 2.5 0.0317 11 800 5 0.0307 12 800 5 0.0309 13 800 10 0.0330 14 800 10 0.0318 15 800 20 0.0225 16 800 20 0.0234 17 1000 2.5 0.0350 18 1000 2.5 0.0352 19 1000 5 0.0373 20 1000 5 0.0361 21 1000 10 0.0432 22 1000 10 0.0402 23 1000 20 0.0297 24 1000 20 0.0306 25 1200 2.5 0.0324 26 1200 2.5 0.0326 27 1200 5 0.0353 28 1200 5 0.0353 29 1200 10 0.0453 30 1200 10 0.0436 31 1200 20 0.0348 32 1200 20 0.0357 I am able to enter my data into R and obtain an ANOVA table (which I have been able to verify as correct using an excel spreadsheet), using the following syntax: >Factorial<-data.frame(A=c(rep(c("600", "600", "600", "600", "800", "800", "800", "800", "1000", "1000", "1000", "1000", "1200", "1200", "1200", "1200"), each=2)), B=c(rep(c("2.5", "5", "10", "20", "2.5", "5", "10", "20", "2.5", "5", "10", "20", "2.5", "5", "10", "20"), each=2)), Response = c(0.0257, 0.0254, 0.0217, 0.0204, 0.0191, 0.021, 0.0133, 0.0139, 0.0312, 0.0317, 0.0307, 0.0309, 0.033, 0.0318, 0.0225, 0.0234, 0.035, 0.0352, 0.0373, 0.0361, 0.0432, 0.0402, 0.0297, 0.0306, 0.0324, 0.0326, 0.0353, 0.0353, 0.0453, 0.0436, 0.0348, 0.0357)) > anova(aov(Response~A*B, data=Factorial)) However, this is as far as I am able to go. I would like to obtain the coefficients of my model, but am unable. I would also like to use other non-linear models as these factors are not linear. Also would like to add A^2 and B^2 into the ANOVA and modeling. Please can you help with regard and offer some advice. Your help is much appreciated. Yours sincerely, Leslie Correia ------------------------------------------------ Department of Process Engineering University of Stellenbosch Private Bag X1 Matieland, 7602 Stellenbosch Tel: 0837012017 E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ------------------------------------------------ [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.