trend README
============
`trend` is a unix-style command line tool which can calculate linear, quadratic
and exponential regressions on incoming data. It uses least squares method to
calculate regressions coefficients. It can also select regressions type
automatically for best fit.
Usage: trend [OPTIONS...] [FILE]
-c --coefs only print coeffs of regression (default)
-t --add add column with trend values
-s --sub substract trend from input data
-p[N] --predict[=N] predict values for N periods
-r[N] --random[=N] randomize predicted values; implies -p
-L --linear use linear regression (default)
-S --square use square regression
-E --exponent use exponential regression
-A --auto try to guess type of regression
Example:
$ trend --square
1 8
2 6
3 5
4 2
5 2
6 1
7 2
9 4
10 5
11 7
12 9
0.23395990844142445 -2.9293889158632327 10.814247069431962
In this example, the last line represents coefficients A, B, C in equation
Y = A*X^2 + B*X +C,
which are most suitable for input data.