-
1 1,2 1
1 , 2
1.
1920 1940 1)Flesch Reading Ease Kincaid Grade Level 2) 3 3)
2.
2.1 Reading-age 1 312 13
2.2 13 4) 1 1111167 728,002 16311345,261
3.
3.1 Collins-Thompson 5) N Gi(i = 1, 2, ..., N)N Mi Mi Gi unigram
T Mi
L(Mi|T ) =wT
C(w)logP (w|Mi) (1)
w T C(w)
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-
T w P (w|Mi)Mi w N Mi Gi
3.2 unigram unigram 3) 2( 1 )
unigram unigram
( 2 ) 1
4.
1 T 1 13 Gi(i = 1, 2, ..., 13) 1
4.1 213 unigramMi x P (x|Mi)
P (x|Mi) = C(x, Di)zDi C(z, Di)
(2)
Di Gi zDi C(z, Di) Di z
4.2 T
Gi Mi
L(Mi|T ) =zT
C(z, T )logP (z|Mi) (3)
13Mi Gi
4.3 Mi T Mi 0 (3) 2 1 13
2 2 2 1 xP (x|Mi)
0
2 1 0
P (x|Mi) = P (x|Mi1) + P (x|Mi+1)2
(4)
P (x|Mi) 0 P (x|Mi1) P (x|Mi+1) 0 Mi (4) 0
4.4 P (x|Mi) L(Mi|T )2 1 1 P (x|Mi)Gaussian-kernel P (x|Mi)
P (x|Mi) =
jAi K(i, j)P (x|Mi)jAi K(i, j)
(5)
(Ai = {k : | k i | h, 1 k N})
hN K(i, j)
K(i, j) = exp
(i j)222
(6)
2 2 L(Mi|T ) 2 3
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-
GT
T
G1
M1
G1
G2
GN
G2
M2
GN
MN
zC(z,T) L(Mi |T)
P(x|Mi)
1
1 RMSE RMSE 0.895 1.638
Gaussian-kernel 0.915 1.482 0.900 1.626
2 0.886 1.7943 0.898 1.701
-0.793 - -0.783 -
13 1 P (x|Mi)2 L(Mi|T )
5.
5.1 Leave-one-out RMSE(Root Mean Square Error) 1 100 12 h 2
10RMSE (h = 2, = 0.9) 1 5 2)
2 3 RMSE 3 RMSE
, +2 , 3 0.920 1.413, GK , 2 0.919 1.412
+GK , 2 , 3 0.919 1.436
2 0.8 5 0.95 1 1RMSE 3 3 3 2 1+GK 1 1 +2 2 22+3 2 23
5.2 4 12 4
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-
3
() Web 4 0 0 0 0 4 0 0 0 0 4 0 0 0 3 1
16 3
6.
2) 6) 14 7)
7.
unigram 0.92
(A) ( 16200009
1) : ,Vol.1, pp. 6685 (1991).
2) , , : , 1988-HI-018, pp.18 (1988).
3) , : , 13 , pp. 534537(2007).
4) , , , : , 14,D3-2 (2008).
5) Collins-Thompson, K. and Callan, J.: Predicting
Reading Difficulty with Statistical Language Mod-
els, Journal of the American Society for Informa-
tion Science and Technology , Vol. 56, No. 13, pp.
14481462 (2005).
6) : , , 34, pp. 122 (1998).
7) , : , NLC2007-32(2007-10), pp. 1924 (2007).
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