Displaying 3 results from an estimated 3 matches for "odnorm".
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2023 Oct 24
2
How to Calculate the Mean by Multiple Groups in R
...which set of variables go on either
side of the formula.
Is this what you're looking for?
> aggregate(OD ~ Time + Target + Conc, data = df, FUN = "mean")
Time Target Conc OD
1 1 BACT 1 765.3333
2 1 BACT 2 745.3333
3 1 BACT 3 675.0000
> aggregate(ODnorm ~ Time + Target + Conc, data = df, FUN = "mean")
Time Target Conc ODnorm
1 1 BACT 1 108.33333
2 1 BACT 2 88.33333
3 1 BACT 3 18.00000
Or using a different form, that might be more straightforward to you:
> aggregate(df[, c("OD", "ODnorm&q...
2023 Oct 24
2
How to Calculate the Mean by Multiple Groups in R
Hello,
I have a data frame with different groups (Time, Target, Conc) and
each entry has a triplicate value of the measurements OD and ODnorm.
How can I merge the triplicates into a single mean value?
I tried the following:
```
df = data.frame(Time=rep(1, 9), Well=paste("A", 1:9, sep=""),
OD=c(666, 815, 815, 702, 739, 795, 657, 705, 663),
Target=rep("BACT", 9),...
2023 Oct 24
1
How to Calculate the Mean by Multiple Groups in R
Also,
> aggregate(cbind(OD, ODnorm) ~ Time + Target + Conc, data = df, FUN = "mean")
Time Target Conc OD ODnorm
1 1 BACT 1 765.3333 108.33333
2 1 BACT 2 745.3333 88.33333
3 1 BACT 3 675.0000 18.00000
(You might wish for "cbind(OD,ODnorm) ~ . - Well", but aggregate.formula is...