Dear Colleagues,

 

As a novice I was trying to calculate Shannon diversity index using
diversity function in vegan package and kept having same error message.

 

Error in sum(..., na.rm = na.rm) : invalid 'mode' of argument

 

My dataset is from microarray and have abundant missing values, so I
tried labeling them as NA and 0, but still same error message.

 

Shannon index is negative sum of proportion times log of proportion, so
I put 1 for missing values to avoid log 0, but still same error message.

 

What do you think I'm missing here?

 

Many thanks in advance.

 

Sanghoon Kang.

 


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