Quite agree with Jeff Newmiller and Bert Gunter.
The error you get (" 'by' must specify a uniquely valid column") is a
very common mistake when the function merge is misused. Although, the
function merge is the good choice. Have you read the manual of the
function sending the command `?merge`.
Hi Sasha,
I'll take a wild guess that your column names have periods (.)
replacing the spaces in the names you use:
species occurrence -> species.occurrence
The error message means that R can't find the variable name you have
used in the "by" argument. The second wild guess is that your column
na
Show us your code! (as the posting guide below requests. Please read the
posting guide).
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Feb 5, 2019 at 10
There are many examples of how to do this properly on the web, and many ways
you could have failed to follow those examples. You need to be much more
specific (using actual R code) about what you did in order for us to help you
get past your specific error. [1][2][3]
You will also avoid the wha
Dear All,
I would like to merge two data sets however I am doing something wrong...
1 data set contains 2 columns of 'species occurrence'(1 column) in Germany
and 'species names' (2 column).
and the second one names of 'Red list species'(1 column) and 'species
status' (2 column).
so I would like
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