摘要

授權條款

此作品已由其作者，Qef，釋出至公有領域。此授權條款在全世界均適用。 這可能在某些國家不合法，如果是的話： Qef授予任何人有權利使用此作品於任何用途，除受法律約束外，不受任何限制。

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