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Asked: 2026-05-25T14:06:17+00:00

I have a sorted list of descending dates. How do I get a probability

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I have a sorted list of descending dates. How do I get a probability history of the difference between the date on the current line and the date on the next line? I want to visualize the frequency of how often requests come in.

09/11/2011 13:46:39
09/11/2011 13:45:18
09/11/2011 13:44:58
09/11/2011 13:40:02
09/11/2011 13:37:58
09/11/2011 13:36:09
09/11/2011 13:32:31
09/11/2011 13:25:29
09/11/2011 13:24:40
09/11/2011 13:23:48

p.s. I’ve never used R before, so the more code the better. Thanks.

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1 Answer

  1. Editorial Team

    Read the data

    df <- read.table(textConnection("
09/11/2011 13:46:39
09/11/2011 13:45:18
09/11/2011 13:44:58
09/11/2011 13:40:02
09/11/2011 13:37:58
09/11/2011 13:36:09
09/11/2011 13:32:31
09/11/2011 13:25:29
09/11/2011 13:24:40
09/11/2011 13:23:48
"), sep="\n")

    Convert to POSIXct date

    df$V1 <- as.POSIXct(df$V1, format="%d/%m/%Y %H:%M:%S")

    Load lattice and plot with the time differences with histogram.

    The function diff is very handy to calculate lagged differences. You will notice that I also use unclass this is because there is no histogram method for class difftime.

    library(lattice)

histogram(unclass(-diff(df$V1)), xlab="Time difference")

    enter image description here

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