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I wanted to analyse my stable isotope data using stable isotope analysis in R (SIAR). When running the model using the command:

model1 <- siarmcmcdirichletv4(data, sources, tef, concdep=0, 500000, 50000)

as advised in the SIAR Manual for Ecologists, I got this message:

Error in Summary.factor(c(1L, 1L, 2L, 2L, 6L, 6L, 7L, 7L, 3L, 3L, 4L,  : max not meaningful for factors.

Can you please advise me how to proceed from here?

durron597
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user3129499
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  • try and make this [reproducible](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) – user1317221_G Dec 23 '13 at 12:45
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    I guess there is a variable in your data that is supposed to be numeric, but is actually a factor (due to a typo in the file or something like that). Check `str(data)`, `str(sources)` and `str(tef)`. – Roland Dec 23 '13 at 14:01

2 Answers2

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SIAR only works with numerical group names, and as far as I remember, they have to start at 1 and run in sequential order in the data file.

FishBoy
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I just had a similar error message using SIAR in R. My problem was caused by the fact that my files were saved as .csv, whereas they need to be in .txt.

shanta
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