subject:"\[R\] Indexing Grouped Data"

Re: [R] Indexing Grouped Data

2012-06-13 Thread William Dunlap

> Behalf > Of Peter Maclean > Sent: Wednesday, June 13, 2012 7:15 AM > To: R mailing list > Subject: Re: [R] Indexing Grouped Data > > I need help in indexing grouped data. In this excample (df1 data), the first > child had a > first immunization at age 2. The second c

Re: [R] Indexing Grouped Data

2012-06-13 Thread Peter Maclean

I need help in indexing grouped data. In this excample (df1 data), the first child had a first immunization at age 2. The second child had the first, second and third immunization at age 5,10, and 12, the third child had first and second immunization at age 4 and 6 and the fourth child had the f