Regresion Lineal Flashcards

1
Q

En una regresión de mínimos cuadrados, los residuos siempre suman _____

A

0

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2
Q

En una regresión de mínimos cuadrados, la linea siempre pasa por

A

el punto (x̅, y̅)

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3
Q

La pendiente también recibe el nombre de _____

A

Densidad (Density)

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4
Q

SSₓₓ corresponde a

A

∑(xᵢ − x̅)²

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5
Q

SSᵧᵧ corresponde a

A

∑(yᵢ − y̅)²

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6
Q

SPₓᵧ corresponde a

A

∑((xᵢ − x̅)² ⋅ ∑(yᵢ − y̅)²)

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7
Q

La varianza de x corresponde a… (suma de cuadrados)

A

SSₓₓ / (n − 1)

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8
Q

Cov(x, y) corresponde a

A

SPₓᵧ / (n - 1)

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9
Q

β̂₁ es igual a…

A

SPₓᵧ / SSₓₓ = Cov(x,y) / Var(x)

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10
Q

Que se debe asumir para una regresión lineal

A

Que ε ≈ Normal(0, σ) iid, con una varianza constante a cada valor de X (homocedasticidad).

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11
Q

La distribución de muestreo de β̂₁ es

A

Normal(β₁, σ / √(SSₓₓ))

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12
Q

β̂₁ es un estimador ______ de β₁

A

no sesgado

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13
Q

El error estándar de β̂₁ es…

A

s / √(SSₓₓ)

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14
Q

El intervalo de confianza (1 - α)% de β₁ es…1

A

β̂₁ ± t_α_/₂ + SE(β̂₁)

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15
Q

La varianza tras calcular β̂₁ y β̂₂ es…

A

n - 2

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16
Q

En test de hipótesis de β₁, t es…

A

(β̂₁ - H_0)/SE(β̂₁)