"Write a model" ?? I have a data set which i am analysing using MINITAB, i have a question which asks me to write a model, and to define all non-arithmetic peices in your model. I have NO idea where to start or what i am supposed to be doing, the data is basically the rainfall (inches) over a period of 6 years. When i graph it using a scatter plot i see no relation or anything, this is what the data looks like (ATTACHED FILE). The periods are months, i have no idea what i am supposed to do, can you please give me some ideas, or if you need more info don't hesitate to ask NWC is the land area being measured for rain fall.