1. A method of automatically generating statistical models for a dataset, comprising: at a computer system having one or more processors and memory storing programs executed by the one or more processors: receiving a user description of a graphical view of a dataset, wherein the user description specifies a graphical relationship between a first field and a second field of the dataset in the graphical view; determining a set of data properties for each of the first and second fields; with no further user input, generating one or more statistical models of the dataset in accordance with the data properties of the first and second fields and data values associated with the first and second fields in the dataset, wherein the one or more statistical models are derived from the data values and are expressed in one or more mathematical equations for describing and predicting a respective trend of one of the first and second fields that varies as a function of the other of the first and second fields; and displaying at least one graphical representation of the one or more statistical models in the graphical view of the dataset.