Hello everybody, I search a test for compare the k means but I have one quantitative variable and two groups date, traitement. And I suppose my samples are dependant with the date. What the statistical test would I use? Thank you. my data: date EU DW wk1 EU1 5,324547829 wk1 EU1 7,321253265 wk1 EU1 4,431712065 wk1 EU2 8,230322407 wk1 EU2 8,546873269 wk1 EU2 5,657332069 wk1 EU3 3,165508618 wk1 EU3 4,431712065 wk1 EU3 1,899305171 wk2 EU1 2,163097556 wk2 EU1 17,61379438 wk2 EU1 15,82754309 wk2 EU2 16,46064481 wk2 EU2 19,30960257 wk2 EU2 13,92823792 wk2 EU3 6,014466374 wk2 EU3 7,280669822 wk2 EU3 5,064813789 wk4 EU1 11,03179753 wk4 EU1 29,75578101 wk4 EU1 22,71252433 wk4 EU2 27,85647584 wk4 EU2 36,71989997 wk4 EU2 20,11680727 wk4 EU3 13,59661321 wk4 EU3 13,2951362 wk4 EU3 14,56133964 wk6 EU1 30,73875474 wk6 EU1 33,27842393 wk6 EU1 35,27512937 wk6 EU2 31,2817185 wk6 EU2 41,53147307 wk6 EU2 35,57093758 wk6 EU3 8,652390223 wk6 EU3 18,6359174 wk6 EU3 15,30807501 _________________________________________________________________ Avec Windows Live OneCare ?liminez tous les virus de votre PC !