Displaying 2 results from an estimated 2 matches for "rdbisch".
2006 Sep 11
2
faster way?
Hi,
Is there a faster way to do this? It takes forever, even on a
moderately sized dataset.
n <- dim(dsn)[1]
dsn2 <- dsn[order(-dsn$xhat),]
dsn2[1, "cumx"] <- dsn2[1, "xhat"]
for (i in 2:n) {
dsn2[i, "cumx"] <- dsn2[i - 1, "cumx"] + dsn2[i, "xhat"]
}
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2006 Aug 30
5
working with summarized data
The data sets I am working with all have a weight variable--e.g.,
each row doesn't mean 1 observation.
With that in mind, nearly all of the graphs and summary statistics
are incorrect for my data, because they don't take into account the
weight.
****
For example "median" is incorrect, as the quantiles aren't calculated
with weights:
sum( weights[X < median(X)] )