File:LinearRegression.svg

Summary[edit]

Gnuplot source code[edit]

set terminal svg fname "Helvetica" fsize 25
set output "LinearRegression.svg"
set key left
set xtics axis 4.0,0.5
set ytics nomirror 1
set border 2
f(x) = a*x + b
fit f(x) 'randpts' using 1:2 via a,b
set yrange [-0.9:4]
plot 'randpts' with points pointtype 7 pointsize 0.3 title 'Datapoints', \
	f(x) with lines linetype 3 linewidth 3 title 'Regression',  \
	0 with lines linetype -1 notitle

The datafile 'randpts' was made in GNU Octave using the commands

f = fopen('randpts', 'w');
for i=1:200; 
   x=rand(1); 
   y=0.2*randn(1) + 3*x + 0.35; 
   fprintf(f, '%g %g\n', x, y); 
end
fclose(f)

(identical code also works in Matlab.)

Licensing[edit]

This work has been released into the public domain by its author, I, Berland. This applies worldwide. In some countries this may not be legally possible; if so: I, Berland grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.