[R] Data Manipulation

[dfong]

Hi,

I just started using R and need some guidance.

I need to create a time series chart in R, but the problem is the data is
not numeric.
The data is in the following format

Study     
A
A
B
B
B
A
C
C
D

Then there is also another column with dates. How can I manipulate this in
order to have something that will count the number of unique entries and
group them.
Say A = 3 B= 3 C=2 D=1

Thanks
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