R version 3.0.1 (2013-05-16) -- "Good Sport"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: i686-pc-linux-gnu (32-bit)

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> x <- c(468,467,463,460,462,461,476,476,471,453,443,442,444,438,427,424,416,406,431,434,418,412,404,409,412,406,398,397,385,390,413,413,401,397,397,409,419,424,428,430,424,433,456,459,446,441,439,454,460,457,451,444,437,443,471,469,454,444,436,442,446,442,438,433,428,426,452,455,439,434,431,435,450,449,442,437,431,433,460,465,451,447,446,449)
> par4 = '12'
> par3 = 'Werkloosheid brutogegevens, ouder dan 25 jaar, '06-'12'
Error: unexpected numeric constant in "par3 = 'Werkloosheid brutogegevens, ouder dan 25 jaar, '06"
Execution halted