[R] Using which function with xts

[Wu Gong]

Let's say your "data" has 2 columns: one is "date" and another is "price",
then

avg = mean(data$price, na.rm=T)
std = sd(data$price, na.rm=T)

The data after those unwanted removed should be:

data[data$price-avg<=3*std,]

-----
A R learner.
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