On Mon, 23 Apr 2012, Vikram Bahure wrote:
Dear R users,
I want to subset a daily zoo series according to its month, find % of "NA"
in each month.
I am finding it difficult to subset the daily dataset into monthly for the
given operation.I am planning to do this for a huge dataset.
Use aggregate(z, as.yearmon, ...) for aggregation to a monthly series. A
simple artificial example is:
## data with NAs
set.seed(1)
x <- rnorm(50)
x[sample(1:50, 10)] <- NA
## as zoo
z <- zoo(x, as.Date("2012-01-01") + 0:49)
## proportion of NAs
aggregate(z, as.yearmon, function(x) mean(is.na(x)))
hth,
Z
Thanks in advance.
Regards
Vikram
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