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Overfitting
Plot.plot({
x:{domain:[0,10]},
y:{domain:[0,10]},
marks:[
Plot.ruleX([0]),
Plot.ruleY([0]),
Plot.line(x,{x:x,y:y,stroke:'red'}),
Plot.dot(X,{x:X,y:Y,fill:'black',r:5}),
Plot.dot(X2,{x:X2,y:Y2,fill:'blue',r:5})
]
})
x = {
const x = []
for(let i = 0; i <= 10; i = i + .01){
x.push(i)
}
return x
}
y = x.map(x => a*x+b)
X = [2,7]
Y = [5-3.09,5+3.19]
X2 = [4,6]
Y2 = [5+1.17,5+.8]
f = (a,b)=>(2*a+b - 1.91)**2+(7*a+b - 8.19)**2
fprimea = (a,b) => 106*(-1.15377 + a + 0.169811*b)
fprimeb = (a,b) => 18*(-1.12222 + a + 0.222222*b)
d3.randomNormal(0,3)()
f(a,b)
(4*a+b - 6.17)**2+(6*a+b - 5.8)**2
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