Dear R-finance list,

Why is the Monthly Return function from the Quantmod packge showing a return
for the month december 1998. When my data begins at 1999-01-04 (YYYY-MM-DD)

> getSymbols("^AEX", from ="1999-01-01")
[1] "AEX"
> head(monthlyReturn(AEX))
         monthly.returns
dec 1998    -0.024654471
jan 1999     0.007573907
feb 1999     0.001510856
mrt 1999     0.068146686
apr 1999    -0.033930813
mei 1999     0.012868642

Greetings,

Werner

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