The Xamarin.Forms Charts control provides different types of trendlines: linear, exponential, power, logarithmic, and polynomial. Trendlines are used to analyze and display trends in data graphically.
A linear trendline is a straight line used with simple linear data sets. It usually shows that something is increasing or decreasing at a steady rate.
An exponential trendline is a curved line used when data values rise or fall at increasingly higher rates. If your data contains zero or negative values, you can not create an exponential trendline.
A power trendline is a curved line that is best used with data sets comparing measurements that increase at a specific rate.
A logarithmic trendline is a curved line that is most useful when the rate of change in the data increases or decreases rapidly and then levels out. It can use negative or positive values.
A polynomial trendline is a curved line that is used when data fluctuates. The polynomial order can be determined by the number of fluctuations in the data or by how many bends in the curve appear.