search for: bigshopdata

Hello everybody, I've got a problem concerning the function unique. I have got a data.frame "shopdata" with 1000 shop which were evaluated at different points in time. With function subset I chose those shops with more then 10 employee and store it in data.frame "bigshopdata" with 700 shops. bigshopdata=subset(shopdata, shopdata$employee>10) Now I use unique(bigshopdata$name) to ensure that each shop name is only listed ones and not two or three times because of an evaluation at different dates. What happens is that unique eliminates also those shops nam...