Hi,

The lab in which I send my samples return the results in a format that
is difficult for me to run my analysis.  The lab outputs the results
where each parameter is its own row and it’s not consistently in the
same order (and not each sample is tested for the same suite of
variables).

e.g.

>dataset

site    parameter  value
a       e2      3
a       e1      1
a       e3      5
b       e3      1
b       e1      2
c       e5      4
c       e4      5
c       e2      2
d       e2      4
d       e4      3
e       e1      2

How would I go about transforming the above table to the one below,
where each parameter has its own column and there is only 1 row of data
for each site?

site    e1      e2      e3      e4      e5
a       1       3       5       NA      NA
b       2       NA      3       NA      NA
c       NA      2       NA      5       4
d       NA      4       NA      3       NA
e       2       NA      NA      NA      NA

I have attempted to write a loop and use the “match” function, but
it kept getting more and more complicated.  I have a feeling that there
is simple solution, but I just don’t see it.

Any insight would be helpful.

Thanks,
Krista

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