Linear regerssion by Gnumeric:

Start program by command gnumeric
In File menu, Open hiiri.csv
Active data part of data which contains independent (explatory) variables 
(e.g. keep caps key pressed, and use arrow keys)
Select in Tools menu, Statistical analysis, and Linear regression
Define dependent Y variable (by activating the column or typing $C$3:$C$16)
By default, the results appear in a new window called Regression
Intercept, column 1 and column 2 tell the linear regression coefficients