On Tue, 1 Apr 2014, Marlin Keith Cox wrote:

A simplified ask is:  when I use the time series plot function, R treats
each time on 9/19/13 as an individual day, when clearly it isn't.

The "ts" class can handle only regular time series. See the "zoo" or "xts" packages for dealing with time series that have an irregular time index. Here, you could use POSIXct or chron time stamps.

Thank you ahead of time.  Keith

ts(chum)
with(chum,plot.ts(Time,PA))

Chum<-

 Time PA  9/18/13 18:29 16  9/19/13 13:29 14  9/19/13 16:29 13.2  9/19/13
17:29 13.1  9/19/13 18:29 13  9/20/13 18:29 12  9/21/13 18:29 10  9/22/13
18:29 9  9/23/13 18:29 7  9/24/13 18:29 5  9/25/13 18:29 3  9/26/13
18:29 2  9/27/13
18:29 1


M. Keith Cox, Ph.D.
Principal
MKConsulting
17105 Glacier Hwy
Juneau, AK 99801
U.S. 907.957.4606

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