摘要

许可协议

本作品已被作者Qef释出到公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： Qef无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。

Gnuplot source

Created with the following Gnuplot file:

set terminal svg font "Bitstream Vera Sans,24"
set output "Linear-regression.svg"

set xrange [0:1]
set yrange [2:6]
set xzeroaxis linetype -1
set yzeroaxis linetype -1
set xtics border nomirror 0.5
set ytics border nomirror 2
set key off
set border 15
set samples 2  # duh, straight line

plot '-' with points pointtype 6 pointsize 1.5 linecolor 6
0.84018771715471	5.0920721752254
0.78309922375861	5.4993770054934
0.91164735793678	5.0219594480046
0.33522275571489	3.663139781769
0.27777471080319	3.2292176040979
0.47739705186216	4.0677809238643
0.36478447279184	3.5137723092023
0.95222972517471	6.3816035819077
0.6357117279599	4.7956233221396
0.1416025553558	2.7597376235082
0.01630057162433	2.0398219692681
0.13723157678602	2.9002851883054
0.15667908925408	2.6485946288034
0.12979044678146	2.3215484331961
0.99892451800356	5.3518979261186
0.5129323944044	4.4596524827421
0.61263983259566	4.1465031113153
0.63755226770302	4.5417962600388
e
plot 3.7*x+2.15 with lines linewidth 3 linecolor 1

The actual data is just randomly choosen points along the line, randomly displaced from it, created with a small Lua program:

function f (x) return 3.7 * x + 2.15 end

for _ = 1, 18 do
    local x = math.random()
    print(x, f(x) * (0.85 + 0.3 * math.random()))
end