I have a data frame with date/times represented as charaacter strings
and and a value at that date/time. I want to get the mean value for
each time of day, across days, and then plot time of day on the x-axis
and means on the y-axis. R doesn't appear to have a built-in time of
day time type (independent of a date), unless I have missed something.
What is the best way to create a time variable so that I can aggregate
and plot by time of day, with time labelled in HH:MM format. My current
approach is to convert all date/times to the same date. I can then
manage the rest of what I want with ggplot2. But I am wondering if
there is an easier/better way to do deal with time of day.
Here is a sample data frame.
df <- structure(list(date = structure(1:8, .Label = c("2015-10-29
00:50:00",
"2015-10-29 09:30:00", "2015-10-29 21:10:00", "2015-10-30 00:50:00",
"2015-10-30 09:30:00", "2015-10-30 21:10:00", "2015-10-31 00:50:00",
"2015-10-31 10:30:00"), class = "factor"), value = c(88L, 17L,
80L, 28L, 23L, 39L, 82L, 79L)), .Names = c("date", "value"), row.names =
c(NA,
-8L), class = "data.frame")
Any suggestions appreciated.
Dan
--
Daniel Nordlund
Bothell, WA USA
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