[R] problem in WRS2

[greg holly]

I got the following error message after running  t2way(y ~ Grup*Time, data
= cp)
  Error in x[[grp[i]]] :
  attempt to select less than one element in get1index

a part of the data is given below. Your help is highly appreciated.

Greg

> head(cp)
  Birey Grup Time         y
1     1    1  Cp1 0.7916386
2     1    1  Cp3 1.7463777
3     1    1  Cp7 1.2008390
4     1    1 Cp14 0.6311380
5     1    1 Cp21 2.1563557
6     1    1 Cp28 1.2008390

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