Testing for One-Factor Models versus Stochastic Volatility Models



process ft (resp. Xt) around point a, over the period [0,1]. Thus,
_ L(n-1)rj

--X~ Σ (g ( fi∕n ) - g (Xi/n ))
n
г =1

diverges (to either -∞ or to ), at rate m, provided that Lχ(r, a) Lf (r, a) = 0 (almost
surely) for all
a A, with A having non-zero Lebesgue measure, that is provided that ft and
Xt have different occupation densities over a non-negligible set.

Finally, Un,m,r can be written as

_ I (n-1)rj / 1 Vn-11                   n (r(j+1)/n ( ( f ) — ( X ))d sʌ

1            nξn <xj=1 {Xj∕n-Xi∕n<ξn} Jn∕n     g Js) 9 s)) J

(28)


n “ I                  Lx (1 ,Xi/n) + oP(1)

Expanding the sums, (28) can be rewritten as

1  /nɪ/n( g( fs )- g( Xs ))d s)

n I     Lχ (1 ,X 1 /n) + oP (1)
+1
£IX/-X/|<jn}nj71/(g(fS)g(Xs))ds)

LX (1 ,X 2/n ) + oP (1)

1{|x/-X[(n-i)r/n]|<n}nj71/n(g(fs^g(Xs))ds)

LX (1, x(n-1)/n) + oP (1)

l 1 /1 {χj∕nι∕nn}n (j∕χ+1 // (g (fs)   g (Xs))ds)

n I               LX(1 ,x 1 /n) + oP(1)

ι 1 {χjn2∕nn}nj/n+1)/n (g (fs)   g (Xs))ds)

LX (1 ,X 2 /n ) + oP (1)

1rr x fn (f(j+1) /n ( g ( fs ) —g ( Xs ))d s ^
      {χj∕n[(n-1)r∕n] <ξn} \/n/n      si''1' s

LX (1, x(n-1)/n) + oP (1)

+...

+ ɪ / ' χ χ . n '■          .g fS     .g Xs ds

n I                LX (1 ,X 1 /n)+ oP (1)

. X n ʃ ■ 's g - -

LX (1 ,x2/n ) + oP (1)

1                   ^ʃ         '    ■ '   ■'

LX (1 ,x ( n-1) /n ) + oP (1)

26



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