Hi, R-users,
data is a matrix like this
AMR BS GE HR MO UK SP500
1974 -0.3505 -0.1154 -0.4246 -0.2107 -0.0758 0.2331 -0.2647
1975 0.7083 0.2472 0.3719 0.2227 0.0213 0.3569 0.3720
1976 0.7329 0.3665 0.2550 0.5815 0.1276 0.0781 0.2384
1977 -0.2034 -0.4271 -0.0490 -0.0938 0.0712 -0.2721 -0.0718
1978 0.1663 -0.0452 -0.0573 0.2751 0.1372 -0.1346 0.0656
1979 -0.2659 0.0158 0.0898 0.0793 0.0215 0.2254 0.1844
1980 0.0124 0.4751 0.3350 -0.1894 0.2002 0.3657 0.3242
1981 -0.0264 -0.2042 -0.0275 -0.7427 0.0913 0.0479 -0.0491
1982 1.0642 -0.1493 0.6968 -0.2615 0.2243 0.0456 0.2141
1983 0.1942 0.3680 0.3110 1.8682 0.2066 0.2640 0.2251
I want to calculate the return say AMR,so I use
re=numeric(10)
for (i in 2:nrow(data))
re[1]=0
re[i]=log(data[i]/data[i-1])
to my surprise, the result is
> re
[1] 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
[9] 0.00000 -1.70109
I don't know what's wrong with my code, and is there alternative way
to do the same?
thanks
Denver
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