search for: timet2

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2008 Apr 14
1
Formula with no intercept
...nd female), and other is Time with four levels (T1, T2, T3 and T4). And for the convenience of post-hoc testing I wanted to consider a model with no intercept for factor Time, so I tried formula Group*(Time-1) However this seems to give me the following terms in the model GroupMale, GroupFemale, TimeT2, TimeT3, TimeT4, GroupMale:TimeT2, GroupMale:TimeT3, GroupMale:TimeT4, GroupFemale:TimeT2, GroupFemale:TimeT3, GroupFemale:TimeT4 which is not exactly what I wanted. Also it seems (Group-1)*Time and (Group-1)*(Time-1) also give me exactly the same set of terms as Group*(Time-1). So I have some co...
2010 Jun 01
1
using the design matrix to correctly configure contrasts
...y interaction (written for convenience to # build on previous 2-way ANOVA design <- model.matrix(~Time + Tissue + Pperiod + Time:Tissue + Time:Pperiod + Tissue:Pperiod) fit <- lmFit(rma.pp, design) #how does this design look: > colnames(design) [1] "(Intercept)" "Timet2" [3] "Timet3" "Timet4" [5] "Timet5" "Timet6" [7] "Timet7" "Timet8" [9] "Timet9" "Timet10" [11] "Timet11" "Timet12" [13] "Timet13&quo...