Question

I’m pretty new to R and programming itself,and right now I have an issue with my data.frame that is not allowing me to continue my work.

I have a set of data as follows

Table 1

    Individual             Score
    Tim                      45
    Tim                      77
    Tim                      32
    Clare                    92
    Clare                    70
    Clare                    88

Let me explain the table 1 above, I have several individuals (TIm and Clare in the example above) and I have their score in a test they presented in 3 different occasions (2009, 2010, 2011) I am trying to figure out a way to turn that above into something like this:

Table2

    Individual             Score09             Score10             Score11
    Tim                      45                   77                  32
    Clare                    92                   70                  88

I used ddply to obtain the Table 1, since I originally had the information of the subsets of the test (the variable score is just the sum of all the subset)

Please let me know if there a way to actually end up with Table 2 instead of Table 1, Since I have over 10000 observations and the Table 1 set up wont let me move forward with the intended propose.

EDIT:

The original df from where Table 1 was generated is:

The data frame is as follows

    Base          Individual     score_math    score_bio     score_chem
    SB1120091       Tim              12            23             10
    SB1120092       Tim              30            25             22
    SB1120101       Tim              17             5             10
    SB1120091       Clare            50            20             22
    SB1120092       Clare            40            10             20
    SB1120101       Clare            47            20             21

And the code was:

>Table1 <-ddply(x, .(Indivual), summarise, Score=(score_math*score_bio*score_chem))

EDIT2:

The original data set has no Year variable but a base variable that provides information about when the test was taken.

Also The Score variable is calculated with as a product of all the subsets scores.

Answer 1

The data:

df <- structure(list(Individual = structure(c(2L, 2L, 2L, 1L, 1L, 1L), 
                     .Label = c("Clare", "Tim"), class = "factor"), 
                     Score = c(45, 77, 32, 92, 70, 88), 
                     count = c(1L, 2L, 3L, 1L, 2L, 3L)), 
                     .Names = c("Individual", "Score", "count"), 
                     row.names = c(NA, -6L), class = "data.frame")
df$count <- rep(c("09", "10", "11"), 2)

• Using reshape from base stat:

  > reshape(df, idvar="Individual", timevar="count", direction="wide", sep="")
  
  #   Individual Score09 Score10 Score11
  # 1        Tim      45      77      32
  # 4      Clare      92      70      88