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spanel: le package R pour l’estimation des données de panel spatiale

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Munich Personal RePEc Archive

spanel: an R package to estimate the

spatial panel data

Zaghdoudi, Taha

Université de Jendouba, Faculté des Scieneces Juridiques

Économiques et de Gestion de Jendouba

June 2016

(2)

s♣❛♥❡❧✿ ▲❡ ♣❛❝❦❛❣❡ ❘ ♣♦✉r ❧✬❡st✐♠❛t✐♦♥

❞❡s ❉♦♥♥é❡s ❞❡ P❛♥❡❧ ❙♣❛t✐❛❧❡

❚❛❤❛ ❩❛❣❤❞♦✉❞✐

❯♥✐✈❡rs✐té ❞❡ ❏❡♥❞♦✉❜❛

❋❛❝✉❧té ❞❡s ❙❝✐❡♥❡❝❡s ❏✉r✐❞✐q✉❡s ➱❝♦♥♦♠✐q✉❡s ❡t ❞❡ ●❡st✐♦♥ ❞❡ ❏❡♥❞♦✉❜❛

❏✉✐♥ ✷✵✶✺

❘és✉♠é

❈❡ ♣❛♣✐❡r ✐♥tr♦❞✉✐t ❧❡ ♣❛❝❦❛❣❡s♣❛♥❡❧ ❞é✈❡❧♦♣♣é s♦✉s ❧❡ ❧❛♥❣❛❣❡ ❞❡ ♣r♦❣r❛♠♠❛✲ t✐♦♥ st❛t✐st✐q✉❡ ❘✳s♣❛♥❡❧♣❡r♠❡t ❧✬❡st✐♠❛t✐♦♥ ❞❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ❛✉t♦r❡✲ ❣r❡ss✐✈❡s ♦♥ ✉t✐❧✐s❛♥t ❧❛ ♠ét❤♦❞❡ ❞❡s ❞♦✉❜❧❡s ♠♦✐♥❞r❡s ❝❛rré❡s ♣r♦♣♦sé ♣❛r❑❡❧❡❥✐❛♥ ❛♥❞ Pr✉❝❤❛ ❬✶✾✾✽❪✱▲❡❡❬✷✵✵✸❪ ❡t❇❛❧t❛❣✐ ❛♥❞ ▲✐✉✱✷✵✶✶✳

▼♦ts ❝❧és ✿ ❉♦♥♥é❡s ❞❡ P❛♥❡❧ ❀ ▼♦❞è❧❡s ❙♣❛t✐❛❧❡s ❀ ❉♦✉❜❧❡s ▼♦✐♥❞r❡s ❈❛r✲ rés

❏❊▲ ✿❈✶✸✱❈✷✶

s♣❛♥❡❧✿ ❆♥ ❘ ♣❛❝❦❛❣❡ t♦ ❡st✐♠❛t❡ t❤❡

❙♣❛t✐❛❧ P❛♥❡❧ ❉❛t❛

❆❜str❛❝t

❚❤✐s ♣❛♣❡r ✐♥tr♦❞✉❝❡s t❤❡s♣❛♥❡❧♣❛❝❛❦❣❡ ❞❡✈❡❧♦♣♣❡❞ ✉♥❞❡r t❤❡ ❘ st❛t✐st✐❝❛❧ ♣r♦✲ ❣r❛♠♠✐♥❣ ❧❛♥❣✉❛❣❡✳s♣❛♥❡❧ ❡st✐♠❛t❡s t❤❡ s♣❛t✐❛❧ ❛✉t♦r❡❣r❡ss✐✈❡ ♣❛♥❡❧ ♠♦❞❡❧s ✉s✐♥❣ t❤❡ t✇♦ st❛❣❡ ❧❡❛st sq✉❛r❡s ♠❡t❤♦❞ ♣r♦♣♦s❡❞ ❜②❑❡❧❡❥✐❛♥ ❛♥❞ Pr✉❝❤❛❬✶✾✾✽❪ ❛♥❞▲❡❡

❬✷✵✵✸❪ ❛♥❞ ❇❛❧t❛❣✐ ❛♥❞ ▲✐✉✱✷✵✶✶✳

❑❡②✇♦r❞s✿ P❛♥❡❧ ❉❛t❛❀ ❙♣❛t✐❛❧ ▼♦❞❡❧❀ ❚✇♦ ❙t❛❣❡ ▲❡❛st ❙q✉❛r❡s❀ ❏❊▲ ❈❧❛ss✐✜❝❛t✐♦♥✿❈✶✸✱❈✷✶

✶ ▼ét❤♦❞❡ ❞✬❡st✐♠❛t✐♦♥

❈♦♥❝è❞❡r♦♥s ❧❡ ♠♦❞è❧❡ ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡ ❛✉t♦r❡❣r❡ss✐✈❡ s✉✐✈❛♥t✿

y =λW y+Xβ+µ ✭✶✮

µ=Zµµ+ν ✭✷✮

(3)

❖ù ② ❡st ❧❛ ✈❛r✐❛❜❧❡ ❞é♣❡♥❞❛♥t❡ ❛✈❡❝ ✉♥❡ ❞✐♠❡♥s✐♦♥ N T ×1 ✱❳ ❡st ❧❛ ♠❛tr✐❝❡ ❞❡s

✈❛r✐❛❜❧❡s ❡①♣❧✐❝❛t✐✈❡s ❛✈❡❝ ✉♥❡ ❞✐♠❡♥s✐♦♥ N T ×k✱ β ❡st ❧❡ ✈❡❝t❡✉r ❞❡s ♣❛r❛♠ètr❡s ❞❡

❞✐♠❡♥s✐♦♥ k×1 ❡tµ❡st ❧❡ ✈❡❝t❡✉r ❞❡s t❡r♠❡s ❞✬❡rr❡✉r ❞❡ ❞✐♠❡♥s✐♦♥ N T ×1✳

W =IT ⊗WN ❡st ✉♥❡ ♠❛tr✐❝❡ ❝❛rré❡ ❛✈❡❝ WN ❞❡ ❞✐♠❡♥s✐♦♥ N×N q✉✐ r❡♣rés❡♥t❡ ❧❛

♠❛tr✐❝❡ ❞❡ ♣♦✐❞s s♣❛t✐❛❧❡✳

❆✈❡❝ N ❡st ❧❡ ♥♦♠❜r❡ ❞❡s ♦❜s❡r✈❛t✐♦♥s ❡t T ❧❡ ♥♦♠❜r❡ ❞❡ ❝♦✉♣❡s tr❛♥s✈❡rs❛❧❡s✳ ▲❡s

❞♦♥♥é❡s s♦♥t ❛rr❛♥❣és ❞✬❛❜♦r❞ ♣❛r t❡♠♣s ♦ù t= 1...T ❡♥s✉✐t❡ ♣❛r ✉♥✐tés ✐♥❞✐✈✐❞✉❡❧❧❡ ♦ù i= 1....N✳

▲❛ str✉❝t✉r❡ ❞❡s ❡rr❡✉rs ❡st ❞♦♥♥é❡ ♣❛r ❧✬éq✉❛t✐♦♥ ✭✷✮ ❛✈❡❝ Zµ = νT ⊗IN q✉✐ ❡st

❧❛ ♠❛tr✐❝❡ ❞✉ ✈❡❝t❡✉r ❛❧é❛t♦✐r❡ ❞❡ ❧✬❡✛❡t ✐♥❞✐✈✐❞✉❡❧ µ q✉✐ s♦♥t s✉♣♣♦sés ✐♥❞é♣❡♥❞❛♥ts ❡t

✐❞❡♥t✐q✉❡♠❡♥t ❞✐str✐❜✉és ✭✐✐❞✮✱(0, σ2

µIN)✳ νT ❡st ✉♥ ✈❡❝t❡✉r ❞❡s ♣❡rt✉r❜❛t✐♦♥s ❞❡ ❞✐♠❡♥s✐♦♥

N T ×1 q✉✐ ❡st s✉♣♣♦sé ✐♥❞é♣❡♥❞❛♥ts ❡t ✐❞❡♥t✐q✉❡♠❡♥t ❞✐str✐❜✉és✱ (0, σ2

νIN T)✳ ❆✉ss✐✱ µ

❡t ν s♦♥t ✐♥❞é♣❡♥❞❛♥ts ❡♥tr❡ ❡✉① ❡t ♣❛r r❛♣♣♦rt à ❧❛ ♠❛tr✐❝❡ ❞❡s ✈❛r✐❛❜❧❡s ❡①♣❧✐❝❛t✐✈❡ X✳

❙✉♣♣♦s♦♥s ♠❛✐♥t❡♥❛♥t q✉❡ A = IT ⊗AN ❛✈❡❝ AN = IN −λWN✱ ❞♦♥❝ ❧✬éq✉❛t✐♦♥ ✭✶✮

❞❡✈✐❡♥t✿

y=A−1

(Xβ+µ)

❛✈❡❝✿

E[W′

yµ] =E[W A−

1

(Xβ+µ)µ′

] =W A−1 Ω6= 0

❖ù ω=E[µµ′

]✳ ▲❛ ✈❛r✐❛❜❧❡ ❞é♣❡♥❞❛♥t❡ s♣❛t✐❛❧❡♠❡♥t r❡t❛r❞é❡Wy ❡st ❝♦rré❧é❡ ❛✈❡❝ ❧❛

♣❡rt✉r❜❛t✐♦♥ µ✳ ❉♦♥❝✱ ❧❛ ♠ét❤♦❞❡ ❞❡s ♠♦✐♥❞r❡s ❝❛rré❡s ♦r❞✐♥❛✐r❡s s❡r❛✐t ✐♥❡✣❝❛❝❡✳

❙✉♣♣♦s♦♥s ❛❧♦rs q✉❡Z = (X, Wy)❡tδ= (β, λ)

✱ ❝✬❡st✲à✲❞✐r❡ q✉❡ ❧✬éq✉❛t✐♦♥ ✭✶✮ ❞❡✈✐❡♥t✿

y=Zδ+µ

P♦✉r ❧❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ❛✉t♦r❡❣r❡ss✐✈❡s à ❝♦✉♣❡s tr❛♥s✈❡rs❛❧❡s✱ ❑❡❧❡❥✐❛♥ ❛♥❞ Pr✉❝❤❛ ❬✶✾✾✽❪ s✉❣❣èr❡♥t ❞❡s ❡st✐♠❛t❡✉rs ❞❡ ❧❛ ♠ét❤♦❞❡ ❞❡s ❞♦✉❜❧❡s ♠♦✐♥❞r❡s ❝❛rré❡s ✭✷s❧s✮ ❜❛sés s✉r ❞❡s ✐♥str✉♠❡♥ts ❢❛✐s❛❜❧❡s ❝♦♠♠❡ H = (X, W X, W2

X) q✉✐ ❞♦♥♥❡♥t✿

d

δ2sls = [Z′PHZ]− 1

Z′P

Hy ✭✸✮

❆✈❡❝PH =H(H′H)−1H′❡st ❧❛ ♠❛tr✐❝❡ ❞❡ ♣r♦❥❡❝t✐♦♥ ❞❛♥sH✳ H ♣❡✉t ♣♦✉r ❧❡ ♠♦♠❡♥t

✐♥❝❧✉r❡ ❞❡s t❡r♠❡s à ♦r❞r❡ s✉♣ér✐❡✉r ❝♦♠♠❡W3

X✱W4

X✱✳✳✳ ❑❡❧❡❥✐❛♥ ❡t ❛❧✳✱✷✵✵✹✳ ❑❡❧❡❥✐❛♥

❛♥❞ Pr✉❝❤❛ ❬✶✾✾✽❪ ♠♦♥tr❡♥t q✉❡ ❧❡s ❡st✐♠❛t❡✉rs ❞❡ ❧❛ ♠ét❤♦❞❡ ✷s❧s s♦♥t ❡✣❝❛❝❡s ❡♥ ❝♦♥s✐❞ér❛♥t q✉❡❧q✉❡s ❝♦♥❞✐t✐♦♥ ❞❡ ré❣✉❧❛r✐té ❣é♥ér❛❧❡✳

❙♦✐t J¯T =JT/T ❡st ✉♥❡ ♠❛tr✐❝❡ ✉♥✐t❛✐r❡ ❞❡ ❞✐♠❡♥s✐♦♥ T✳ ❆✉ss✐ s♦✐t✱ ET = IT J¯T

❡♥ s✉✐t❡ ♦♥ ❞é✜♥✐❡ P ❝♦♠♠❡ ❧❛ ♣r♦❥❡❝t✐♦♥ ❞❛♥s Zµ✱ ❝✬❡st✲à✲❞✐r❡ q✉❡ P = ¯JT ⊗IN ❡t

Q=IN T −P =ET ⊗IN ✳ ❖♥ ♠✉❧t✐♣❧✐❡ ❧✬éq✉❛t✐♦♥ ✭✸✮ ♣❛rQ ♦♥ ♦❜t✐❡♥t✿

˜

y=λWy˜+ ˜Xβ+ ˜µ ✭✹✮

❈❡❝✐ ❡st ♦❜t❡♥✉ ♣❛r ❧❡ ❢❛✐t q✉❡ QW = (ET ⊗ IN)(IT ⊗ WN) = (ET ⊗ WN) =

(IT ⊗ WN)(ET ⊗ IN) = W Q✳ ❖♥ ❛♣♣❧✐q✉❛♥t ❧❛ ♠ét❤♦❞❡ ✷s❧s ❞❡ ❑❡❧❡❥✐❛♥ ❡t Pr✉❝❤❛

✭✶✾✾✽✮ ❛ ❝❡ Q tr❛♥s❢♦r♠é ❞❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ❛✉t♦r❡❣r❡ss✐✈❡s✱ ♦♥ ♦❜t✐❡♥t ❧❡s

❡st✐♠❛t❡✉rs δ ❞✉ ✷s❧s ❡✛❡t ✜①❡ s♣❛t✐❛❧❡ ✭❋❊✲❙✷❙▲❙✮ ❜❛sé s✉r H˜ = ( ˜X, WX, W˜ 2 ˜

X) = (QX, QW X, QW2

X) =QH✳

❘❡♠❛rq✉❡✿ ▲❡ s2 ❞❡ ❋❊✲❙✷❙▲❙ ❢♦✉r♥✐t ❞❡s ❡st✐♠❛t❡✉rs ❡✣❝❛❝❡s ˆ

σv

2

❞❡ σ2

v✳

P♦✉r ♦❜t❡♥✐r ❧✬❡st✐♠❛t❡✉r ❞❡ ✷s❧s ❡✛❡t ❜❡t✇❡❡♥ ♦♥ ♠✉❧t✐♣❧✐❡ ❧✬éq✉❛t✐♦♥ ✭✸✮ ♣❛r P ♦♥

❛✉r❛✿

(4)

¯

y=λWy¯+ ¯Xβ+ ¯µ

❈❡❝✐ ❡st ♦❜t❡♥✉ ♣❛r ❧❡ ❢❛✐t q✉❡ P W = ( ¯JT ⊗IN)(IT ⊗WN) = ( ¯JT ⊗WN) = (IT ⊗

WN)( ¯JT ⊗IN) = W P✳ ❖♥ ❛♣♣❧✐q✉❛♥t ❧❛ ♠ét❤♦❞❡ ✷s❧s ❞❡ ❑❡❧❡❥✐❛♥ ❡t Pr✉❝❤❛ ✭✶✾✾✽✮

❛ ❝❡ P tr❛♥s❢♦r♠é ❞❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ❛✉t♦r❡❣r❡ss✐✈❡s✱ ♦♥ ♦❜t✐❡♥t ❧❡s ❡st✐♠✲

❛t❡✉rs δ ❞✉ ✷s❧s ❡✛❡t ❜❡t✇❡❡♥ s♣❛t✐❛❧❡ ✭❇❊✲❙✷❙▲❙✮ ❜❛sé s✉r H¯ = ( ¯X, WX, W¯ 2 ¯

X) = (P X, P W X, P W2

X) = P H✳

❘❡♠❛rq✉❡✿ ▲❡s2

❞❡ ❇❊✲❙✷❙▲❙ ❢♦✉r♥✐t ❞❡s ❡st✐♠❛t❡✉rs ❡✣❝❛❝❡sσˆ1 2

❞❡σ2 1 =T σ

2

µ+σ

2

ν✳

❇❛❧t❛❣✐ ✭✷✵✵✽✮✱ ♠♦♥tr❡ q✉❡ ❧❛ ♠❛tr✐❝❡ ✈❛r✐❛♥❝❡✲❝♦✈❛r✐❛♥❝❡ ❞❡ µ ❡st Ω = E(µ′µ) = σ2

1P +σ 2

vQ✱ ❡t Ω−

1/2

= (σ−1

1 P +σ− 1

v Q)✳ ❙✐ ♦♥ ♠✉❧t✐♣❧✐❡ à ❣❛✉❝❤❡ ❧✬éq✉❛t✐♦♥ ✭✸✮ ♣❛rΩ−

1/2

♦♥ ❛✉r❛✿

˙

y= ˙Zδ+ ˙µ ✭✺✮

❖ù y˙ = Ω−1/2

y✱ µ˙ = Ω−1/2

µ ❡t Z˙ = Ω−1/2

Z = Ω−1/2

(X, WN) = ( ˙X,W˙ )✳ ❈❡❝✐ ❡st

♦❜t❡♥✉ ♣❛r Ω−1/2

WN = (σ−

1

1 P W +σ− 1

v QW) = (σ−

1

1 W P +σ− 1

v W Q) = WNΩ−1/2✳ P❛r ❧❛

s✉✐t❡ ❧✬éq✉❛t✐♦♥ ✭✺✮ ❞❡✈✐❡♥t✿

˙

y=λWy˙ + ˙Xβ+ ˙µ

❖♥ ❛♣♣❧✐q✉❛♥t ❧❛ ♠ét❤♦❞❡ ✷s❧s ❞❡ ❑❡❧❡❥✐❛♥ ❛♥❞ Pr✉❝❤❛ ❬✶✾✾✽❪ à ❧❛ tr❛♥s❢♦r♠❛t✐♦♥

Ω−1/2

❞❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ❛✉t♦r❡❣r❡ss✐✈❡ ♦♥ ♦❜t✐❡♥t ❧❡s ❡st✐♠❛t❡✉rs δ ❞❡ ❧✬❡✛❡t

❛❧é❛t♦✐r❡ ❞❡s ❞♦✉❜❧❡s ♠♦✐♥❞r❡s ❝❛rré❡s ✭❘❊✲✷❙▲❙✮ ❞♦♥♥é❡s ♣❛r✿

\

δRE−2sls= [ ˙Z′PHZ˙]− 1 ˙

Z′P

Hy˙

❛✈❡❝H˙ = ( ˙X, WX, W˙ 2 ˙

X) = (Ω−1/2

X, WΩ−1/2

X, W2 Ω−1/2

X) = (Ω−1/2

X,Ω−1/2

W X,Ω−1/2

W2

X) = Ω−1/2

H

✷ ❊①❡♠♣❧❡

❉❛♥s ❝❡tt❡ s❡❝t✐♦♥ ♦♥ ❞♦♥♥❡ ✉♥ ❡①❡♠♣❧❡ ♣r❛t✐q✉❡ ❞❡ ❧✬✉t✐❧✐s❛t✐♦♥ ❞✉ ♣❛❝❦❛❣❡ s♣❛♥❡❧✳

★ ❖✉✈r✐r ❧❡ ♣❛❝❛❦❣❡

❧✐❜r❛r②✭s♣❛♥❡❧✮

★ ■♠♣♦rt❡r ❧❡s ❞♦♥♥é❡s

❞❛t❛✭Pr♦❞✉❝✮

★❊①tr❛✐r❡ ❧❛ ♠❛tr✐❝❡ ❞❡ ♣♦✐❞s s♣❛t✐❛❧❡s

❞❛t❛✭✧✉s❛✇✇✧✮

★ ❊st✐♠❛t✐♦♥ ❞❡ ❧✬❡❢❢❡t ❢✐①❡

❢①❁✲s♣❛♥✭❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣✱Pr♦❞✉❝✱ ✉s❛✇✇✱♥❂✹✽✱t❂✶✼✱♠♦❞❡❧❂✧❢❡✧✮

s✉♠♠❛r②✭❢①✮

(5)

★★ ❋♦r♠✉❧❛✿❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣ ★★

★★ ❇❛❧❛♥❝❡❞ P❛♥❡❧✿ ♥✿ ✹✽ t✿ ✶✼ ◆✿ ✽✶✻ ★★ ❘sq✉❛r❡❞ ✿ ✵✳✵✷✵✵✺✼✸✻

★★ ❊st✐♠❛t❡s ❙t❞✳❊rr ❚✲✈❛❧✉❡ P✲❱❛❧✉❡

★★ ❧♦❣✭♣❝❛♣✮ ✲✵✳✵✹✵✵✼✸✹✸ ✵✳✵✷✻✻✼✽✹✽ ✲✶✳✺✵✷✶ ✵✳✶✸✸✺ ★★ ❧♦❣✭♣❝✮ ✵✳✷✷✵✼✹✸✺✺ ✵✳✵✷✺✵✻✹✵✾ ✽✳✽✵✼✷ ❁ ✷✳✷❡✲✶✻ ✯✯✯ ★★ ❧♦❣✭❡♠♣✮ ✵✳✻✼✵✻✻✸✸✸ ✵✳✵✸✵✼✷✷✻✹ ✷✶✳✽✷✾✻ ❁ ✷✳✷❡✲✶✻ ✯✯✯ ★★ ✉♥❡♠♣ ✲✵✳✵✵✹✼✹✶✺✼ ✵✳✵✵✵✾✶✵✹✶ ✲✺✳✷✵✽✷ ✷✳✹✷✵❡✲✵✼ ✯✯✯ ★★ ✵✳✶✽✼✶✽✾✻✸ ✵✳✵✷✺✽✼✹✷✽ ✼✳✷✸✹✻ ✶✳✵✽✸❡✲✶✷ ✯✯✯ ★★ ✲✲✲

★★ ❙✐❣♥✐❢✳ ❝♦❞❡s✿ ✵ ✬✯✯✯✬ ✵✳✵✵✶ ✬✯✯✬ ✵✳✵✶ ✬✯✬ ✵✳✵✺ ✬✳✬ ✵✳✶ ✬ ✬ ✶

★ ▲❡ ♠♦❞è❧❡ ❜❡t✇❡❡♥

❜❡❁✲s♣❛♥✭❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣✱Pr♦❞✉❝✱ ✉s❛✇✇✱♥❂✹✽✱t❂✶✼✱♠♦❞❡❧❂✧❜❡✧✮

s✉♠♠❛r②✭❜❡✮

★★ ❋♦r♠✉❧❛✿❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣ ★★

★★ ❇❛❧❛♥❝❡❞ P❛♥❡❧✿ ♥✿ ✹✽ t✿ ✶✼ ◆✿ ✽✶✻ ★★ ❘sq✉❛r❡❞ ✿ ✵✳✾✾✸✾✷✸✷

★★ ❊st✐♠❛t❡s ❙t❞✳❊rr ❚✲✈❛❧✉❡ P✲❱❛❧✉❡

★★ ✭■♥t❡r❝❡♣t✮ ✶✳✻✾✷✽✾✵✶ ✵✳✼✼✽✶✸✺✽ ✷✳✶✼✺✻ ✵✳✵✷✾✽✼✺✹ ✯ ★★ ❧♦❣✭♣❝❛♣✮ ✵✳✶✼✷✸✾✹✺ ✵✳✶✻✶✻✻✺✾ ✶✳✵✻✻✹ ✵✳✷✽✻✺✼✼✶ ★★ ❧♦❣✭♣❝✮ ✵✳✸✵✶✻✼✶✼ ✵✳✵✾✶✵✻✾✹ ✸✳✸✶✷✺ ✵✳✵✵✵✾✻✺✺ ✯✯✯ ★★ ❧♦❣✭❡♠♣✮ ✵✳✺✽✹✸✶✼✺ ✵✳✶✸✶✸✸✶✷ ✹✳✹✹✾✷ ✾✳✽✷✸❡✲✵✻ ✯✯✯ ★★ ✉♥❡♠♣ ✲✵✳✵✵✷✻✶✽✸ ✵✳✵✷✷✼✻✵✸ ✲✵✳✶✶✺✵ ✵✳✾✵✽✹✹✸✾ ★★ ✲✵✳✵✵✾✸✻✹✻ ✵✳✵✺✸✹✶✼✻ ✲✵✳✶✼✺✸ ✵✳✽✻✵✽✽✶✵ ★★ ✲✲✲

★★ ❙✐❣♥✐❢✳ ❝♦❞❡s✿ ✵ ✬✯✯✯✬ ✵✳✵✵✶ ✬✯✯✬ ✵✳✵✶ ✬✯✬ ✵✳✵✺ ✬✳✬ ✵✳✶ ✬ ✬ ✶

★ ❊st✐♠❛t✐♦♥ ❧✬❡❢❢❡t ❛❧é❛t♦✐r❡

r❛♥❁✲s♣❛♥✭❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣✱Pr♦❞✉❝✱ ✉s❛✇✇✱♥❂✹✽✱t❂✶✼✱♠♦❞❡❧❂✧r❡✧✮

s✉♠♠❛r②✭r❛♥✮

★★ ❋♦r♠✉❧❛✿❧♦❣✭❣s♣✮ ⑦ ❧♦❣✭♣❝❛♣✮ ✰ ❧♦❣✭♣❝✮ ✰ ❧♦❣✭❡♠♣✮ ✰ ✉♥❡♠♣ ★★

★★ ❇❛❧❛♥❝❡❞ P❛♥❡❧✿ ♥✿ ✹✽ t✿ ✶✼ ◆✿ ✽✶✻ ★★ ❘sq✉❛r❡❞ ✿ ✵✳✾✺✵✺✷✽

★★ ❊st✐♠❛t❡s ❙t❞✳❊rr ❚✲✈❛❧✉❡ P✲❱❛❧✉❡

★★ ✭■♥t❡r❝❡♣t✮ ✶✳✾✷✼✶✾✽✺✶ ✵✳✶✼✶✵✷✼✾✾ ✶✶✳✷✻✽✸ ❁ ✷✳✷❡✲✶✻ ✯✯✯ ★★ ❧♦❣✭♣❝❛♣✮ ✲✵✳✵✵✸✾✷✻✺✸ ✵✳✵✷✺✻✹✼✺✻ ✲✵✳✶✺✸✶ ✵✳✽✼✽✹ ★★ ❧♦❣✭♣❝✮ ✵✳✷✺✶✸✾✷✷✷ ✵✳✵✷✸✽✶✾✸✷ ✶✵✳✺✺✹✶ ❁ ✷✳✷❡✲✶✻ ✯✯✯ ★★ ❧♦❣✭❡♠♣✮ ✵✳✼✵✹✼✶✾✵✹ ✵✳✵✷✽✾✽✵✻✼ ✷✹✳✸✶✻✾ ❁ ✷✳✷❡✲✶✻ ✯✯✯

(6)

★★ ✉♥❡♠♣ ✲✵✳✵✵✺✺✽✹✸✽ ✵✳✵✵✵✾✵✹✵✸ ✲✻✳✶✼✼✷ ✶✳✵✸✷❡✲✵✾ ✯✯✯ ★★ ✵✳✶✵✸✵✶✽✷✸ ✵✳✵✷✵✷✺✽✽✾ ✺✳✵✽✺✶ ✹✳✺✻✻❡✲✵✼ ✯✯✯ ★★ ✲✲✲

★★ ❙✐❣♥✐❢✳ ❝♦❞❡s✿ ✵ ✬✯✯✯✬ ✵✳✵✵✶ ✬✯✯✬ ✵✳✵✶ ✬✯✬ ✵✳✵✺ ✬✳✬ ✵✳✶ ✬ ✬ ✶

❘❡♠❛rq✉❡✿ ❧❛ ❞❡r♥✐èr❡ ❧✐❣♥❡ ❞❡s rés✉❧❛ts ❞✬❡st✐♠❛t✐♦♥s r❡♣rés❡♥t❡ ❲✯r❤♦✳

★ ▲❡ t❡st ❞❡ ❍❛✉s♠❛♥

❤❛✉s♠❛♥✭❢①✱ r❛♥✮

★★

★★ ❍❛✉s♠❛♥ ❚❡st ★★ ❈❤✐sq✿ ✷✽✳✺✶✾✹✹

★★ P✲✈❛❧✉❡✿ ✷✳✽✽✵✸✽✹❡✲✵✺ ★★ ❞❢✿ ✺

✸ ❝♦♥❝❧✉s✐♦♥

▲❛ ♠ét❤♦❞❡ ❞❡s ❞♦✉❜❧❡s ♠♦✐♥❞r❡s ❝❛rré❡s ✉t✐❧✐sé❡ ❞❛♥s ❝❡ ♣❛❝❦❛❣❡ ❡st ❧❛ ♣❧✉s ❢❛❝✐❧❡ à ❛♣♣❧✐q✉❡r✳ ❊♥ ❡✛❡t✱ ❞✬❛✉tr❡ ♠ét❤♦❞❡s s♦♥t ❛✉ss✐ ✉t✐❧✐sé❡s ♣♦✉r ❡st✐♠❡r ❧❡s ❞♦♥♥é❡s ❞❡ ♣❛♥❡❧ s♣❛t✐❛❧❡s ♣r✐♥❝✐♣❛❧❡♠❡♥t ❝❡❧❧❡ ❞❡s ♠❛①✐♠✉♠s ❞❡ ✈r❛✐s✲s❡♠❜❧❛♥❝❡s ❡t ❞❡s ♠♦♠❡♥ts ❣é♥ér❛❧✐sés ❡♥ ♣❛rt✐❝✉❧✐❡r ❞❛♥s ❧❡ ♣❛❝❦❛❣❡ s♣❧♠ s✉r ❘ ❡t ①s♠❧❡ s✉r ❙❚❆❚❆✳

❘❡❢❡r❡♥❝❡s

❇❛❞✐ ❍ ❇❛❧t❛❣✐ ❛♥❞ ▲♦♥❣ ▲✐✉✳ ■♥str✉♠❡♥t❛❧ ✈❛r✐❛❜❧❡ ❡st✐♠❛t✐♦♥ ♦❢ ❛ s♣❛t✐❛❧ ❛✉t♦r❡❣r❡ss✐✈❡ ♣❛♥❡❧ ♠♦❞❡❧ ✇✐t❤ r❛♥❞♦♠ ❡✛❡❝ts✳ ❊❝♦♥♦♠✐❝s ▲❡tt❡rs✱ ✶✶✶✭✷✮✿✶✸✺✕✶✸✼✱ ✷✵✶✶✳

❍❛rr② ❍ ❑❡❧❡❥✐❛♥ ❛♥❞ ■♥❣♠❛r ❘ Pr✉❝❤❛✳ ❆ ❣❡♥❡r❛❧✐③❡❞ s♣❛t✐❛❧ t✇♦✲st❛❣❡ ❧❡❛st sq✉❛r❡s ♣r♦✲ ❝❡❞✉r❡ ❢♦r ❡st✐♠❛t✐♥❣ ❛ s♣❛t✐❛❧ ❛✉t♦r❡❣r❡ss✐✈❡ ♠♦❞❡❧ ✇✐t❤ ❛✉t♦r❡❣r❡ss✐✈❡ ❞✐st✉r❜❛♥❝❡s✳ ❚❤❡ ❏♦✉r♥❛❧ ♦❢ ❘❡❛❧ ❊st❛t❡ ❋✐♥❛♥❝❡ ❛♥❞ ❊❝♦♥♦♠✐❝s✱ ✶✼✭✶✮✿✾✾✕✶✷✶✱ ✶✾✾✽✳

❍❛rr② ❍ ❑❡❧❡❥✐❛♥✱ ■♥❣♠❛r ❘ Pr✉❝❤❛✱ ❛♥❞ ❨❡✈❣❡♥② ❨✉③❡❢♦✈✐❝❤✳ ■♥str✉♠❡♥t❛❧ ✈❛r✐❛❜❧❡ ❡st✐♠❛t✐♦♥ ♦❢ ❛ s♣❛t✐❛❧ ❛✉t♦r❡❣r❡ss✐✈❡ ♠♦❞❡❧ ✇✐t❤ ❛✉t♦r❡❣r❡ss✐✈❡ ❞✐st✉r❜❛♥❝❡s✿ ▲❛r❣❡ ❛♥❞ s♠❛❧❧ s❛♠♣❧❡ r❡s✉❧ts✳ ❆❞✈❛♥❝❡s ✐♥ ❊❝♦♥♦♠❡tr✐❝s✿ ❙♣❛t✐❛❧ ❛♥❞ ❙♣❛t✐♦✲❚❡♠♣♦r❛❧ ❡❝♦♥♦♠❡tr✐❝s✱ ♣❛❣❡s ✶✻✸✕✶✾✽✱ ✷✵✵✹✳

▲✉♥❣✲❢❡✐ ▲❡❡✳ ❇❡st s♣❛t✐❛❧ t✇♦✲st❛❣❡ ❧❡❛st sq✉❛r❡s ❡st✐♠❛t♦rs ❢♦r ❛ s♣❛t✐❛❧ ❛✉t♦r❡❣r❡ss✐✈❡ ♠♦❞❡❧ ✇✐t❤ ❛✉t♦r❡❣r❡ss✐✈❡ ❞✐st✉r❜❛♥❝❡s✳ ❊❝♦♥♦♠❡tr✐❝ ❘❡✈✐❡✇s✱ ✷✷✭✹✮✿✸✵✼✕✸✸✺✱ ✷✵✵✸✳

References

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