The Trending feature takes as input several periods of traffic data or other data. It then performs a “trending” by extrapolating future growth of the data based on a number of user-supplied parameters such as the type of regression to use, the number of points to extrapolate, and so on. The Trending data input file can be any one of four different Network Files. Alternatively, you can specify a separate input file by choosing Trending > Other Files. The file formats for all these input files are described briefly below.