Hello. I have a file with 480 lines but each 6 lines corresponding just one sample. How can can work out the linear regression to each 6 lines? I use the model: model=lm(y~x) Sueli Rodrigues Agronomy Eng. - UNESP Master Degree - USP/ESALQ PPG-Soils and Plants Nutrition Phones(19)93442981 (19)33719762