R help - Jul 2007 - the table function

Hello all,

I want to use the "table" function, but for every id I have a
different no.
of rows (obs.).

If I write:

table(x$class, x$infec)

I don't get the right frequencies because I should count every id once, if
id 1 has 20 observations It should count as one.

can I use unique func. here?

Hope it's clear.

thank you,

Sigalit.

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