R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: i686-pc-linux-gnu (32-bit)

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> x <- c(280190,280408,276836,275216,274352,271311,289802,290726,292300,278506,269826,265861,269034,264176,255198,253353,246057,235372,258556,260993,254663,250643,243422,247105,248541,245039,237080,237085,225554,226839,247934,248333,246969,245098,246263,255765,264319,268347,273046,273963,267430,271993,292710,295881,293299,288576,286445,297584,300431,298522,292213,285383,277537,277891,302686,300653,296369,287224,279998,283495,285775,282329,277799,271980,266730,262433,285378,286692,282917,277686,274371,277466,290604,290770,283654,278601,274405,272817,294292,300562,298982,296917,295008,297295)
> par4 = '12'
> par3 = 'Aantal NWWZ mannen '06-'12'
Error: unexpected numeric constant in "par3 = 'Aantal NWWZ mannen '06"
Execution halted