Hello Listers,
I am tracking home ranges of herbivorous reef fish and I have an extremely
large data set that includes 300,000 time-stamped lat/long coordinates. I
would like to assign a rank number to date/time in order to test position
of fish versus tidal level. I only have only taken tide level 4x/day so I
would like to create a function that ranks my temporal lat/long data as
presence/absence (0/1) of high tide or low tide to see if this
environmental factor significantly affects movement by using T-testing. I
am not sure how I would go about making a loop or incrementing an "i" value
to represent this in R. Should I first assign a numerical value to the
date/time before I try to quantify this?
I included headers of the data I am looking at below if this helps.
Stacy Bierwagen
TIDE DATA
date time tidal height
days since day 0 time as 24h fraction h since day 0
days since day 0 tidal height
6/1/2013 4:13 0.33
0 0.175694444 4.216666667
0.175694444 0.33
6/1/2013 11:05 1.31
0 0.461805556 11.08333333
0.461805556 1.31
6/1/2013 14:31 1.04
0 0.604861111 14.51666667
0.604861111 1.04
6/1/2013 21:25 1.66
0 0.892361111 21.41666667
0.892361111 1.66
6/2/2013 4:49 0.1
TEMPORAL DATA:
Date TimeGMT DTHI DTConvertHI TConvertHI Frequency Signal Gain (dB)
Latitude Longitude 6/14/2013 23:52:52.336 06142013 23:52:52.336 06142013
13:52:52.336 13:52:52.000 63 86 0 21.43267 -157.791 6/14/2013
23:52:50.295 06142013
23:52:50.295 06142013 13:52:50.295 13:52:50.000 63 90 0 21.43267 -157.791
6/14/2013 23:52:38.051 06142013 23:52:38.051 06142013 13:52:38.051
13:52:38.000 63 88 0 21.43267 -157.791 6/14/2013 23:52:37.032 06142013
23:52:37.032 06142013 13:52:37.032 13:52:37.000 63 86 0 21.43267 -157.791
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