Hi
I have a data frame with values in following format.


param       case1
1               a
2               b
2               c
2               d
3               e
4               f


how to use aggregate so that it I only one row for each 'param' value.

the output for the above input should be

param     case1
1      a
2      b,c,d
3      e
4      f

Thanks
M



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Mary Kindall
Yorktown Heights, NY
USA

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