I am sorry but I am at a loss here. According to your sample data you have 3 Species : Buzz, Ptedav, Ptemes, but you say that "Buzz" indicates that the bat is feeding. What has that to do with feeding?
Assuming Buzz is feeding activity, are all incidents of feeding activity a single point in time? Likewise the data has multiple entries such as Ptedav 7717 7/3/2000 20:15 Ptedav 7717 7/3/2000 20:15 Ptedav 7717 7/3/2000 20:15 Ptedav 7717 7/3/2000 20:15 What does that represent? On Wed, 25 Dec 2019 at 07:29, Neotropical bat risk assessments <neotropical.b...@gmail.com> wrote: > > Hi all, > > It seems R has gotten better/more packages in dealing with time data. > > I want to create "simple" summaries of time for bat activity. > Data is all in an Access relational database and exported as a CSV file > with 4 columns in this format: > Species = a 6 letter code or "Buzz" to indicated when bats are feeding > Location = a 4 digit number > Date= MMDDYYYY > Time=HH:MM (24 hr format) > > Species Location Date Time > Buzz 7716 1/25/2000 0:05 > Buzz 7716 1/25/2000 0:05 > Buzz 7716 1/25/2000 0:05 > Buzz 7716 1/25/2000 0:47 > Buzz 7716 1/25/2000 0:47 > Buzz 7716 1/25/2000 0:47 > Buzz 7716 1/25/2000 0:47 > Buzz 7717 7/3/2000 20:17 > Buzz 7717 7/3/2000 20:17 > Buzz 7717 7/3/2000 20:17 > Buzz 7717 7/3/2000 20:17 > Buzz 7717 7/3/2000 20:30 > Buzz 7717 7/3/2000 20:30 > Buzz 7717 7/3/2000 20:30 > Buzz 7717 7/3/2000 20:30 > Ptedav 7717 7/3/2000 20:14 > Ptedav 7717 7/3/2000 20:15 > Ptedav 7717 7/3/2000 20:15 > Ptedav 7717 7/3/2000 20:15 > Ptedav 7717 7/3/2000 20:15 > Ptedav 7717 7/3/2000 20:15 > Ptedav 7717 7/3/2000 20:17 > Ptedav 7717 7/3/2000 20:17 > Ptedav 7717 7/3/2000 20:17 > Ptedav 7717 7/3/2000 20:18 > Ptedav 7717 7/3/2000 20:18 > Ptedav 7717 7/3/2000 20:18 > Ptedav 7717 7/3/2000 20:18 > Ptedav 7717 7/3/2000 20:18 > Ptemes 7717 7/3/2000 23:15 > Ptemes 7717 7/3/2000 23:21 > Ptemes 7717 7/3/2000 23:22 > Ptemes 7717 7/3/2000 23:23 > Ptemes 7717 7/3/2000 23:25 > Ptemes 7717 7/3/2000 23:26 > Ptemes 7717 7/3/2000 23:27 > Ptemes 7717 7/3/2000 23:28 > Ptemes 7717 7/3/2000 23:29 > Ptemes 7717 7/3/2000 23:33 > Ptemes 7717 7/3/2000 23:35 > Ptemes 7717 7/3/2000 23:36 > Ptemes 7717 7/3/2000 23:37 > > The above is clearly not a complete DF but only a format sample. Data > begins when the first bat was recorded and ends when the last bat was > recorded. So all are times from sunset to sunrise. Dates roll over so > for example one night of data would begin at 18:00 1/1/2000 and end > 06:00 1/2/2000. > > What I need to do is have a summary of Buzz events (feeding) and > calculate the percentage of total time bats were active and have a > summary of time feeding buzz was recorded and total bat activity to > determine what percentage of time was spent with feeding attempts over > the active period. > > This by all bats by survey night and by single species by survey night. > Any suggestions welcomed. > > Happy holidays all > > > -- > Bruce W. Miller, PhD. > Neotropical bat risk assessments > Conservation Fellow - Wildlife Conservation Society > > If we lose the bats, we may lose much of the tropical vegetation and the > lungs of the planet > > Using acoustic sampling to identify and map species distributions > and pioneering acoustic tools for ecology and conservation of bats for >25 > years. > > Key projects include providing free interactive identification keys and call > fact sheets for the vocal signatures of New World Bats > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- John Kane Kingston ON Canada ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
