Just had a look at one of my Wikifolios: the overall performance is positive but the annualized one is negative. Sorry guys (and gals): it is impossible, since the total performance is calculated according to , where is the annual[ized] return, an is the [fractional] number of years (and the latter is obviously positive). Even if you use the formula of continuous rate (which you definitely do not understand since it is slightly beyond the school math), it still cannot be so that is negative but the overall performance is positive.
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