Thanks to David's help I subset my large data set and produced a smaller
one for a single stream and 7 factors of interest. The structure of this
data frame is:
str(burns.tds.anal)
'data.frame': 718 obs. of 4 variables:
$ site : Factor w/ 143 levels "BC-0.5","BC-1",..: 1 1 4 6 4 4 4 5 5 5
$ sampdate: Date, format: "1996-06-02" "1996-06-02" ...
$ param : Factor w/ 7 levels "Ca","Cl","Cond",..: 6 7 3 6 3 3 3 3 3 3
$ quant : num 194 530 826 36 848 ...
and a summary of it shows:
summary(burns.tds.anal)
site sampdate param quant
BC-3 :460 Min. :1992-03-27 Ca : 65 Min. : 1.00
BC-2 :107 1st Qu.:1994-09-21 Cl :148 1st Qu.: 14.03
BC-1 : 62 Median :1996-05-21 Cond: 94 Median : 64.40
BC-4 : 38 Mean :1998-11-19 Mg : 65 Mean : 189.47
BC-1.5 : 28 3rd Qu.:2002-10-31 Na : 34 3rd Qu.: 285.75
BC-0.5 : 12 Max. :2011-05-18 SO4 :155 Max. :2058.00
(Other): 11 TDS :157 NA's : 8.00
a sample of the data in burns.tds.anal is:
burns.tds.anal
site sampdate param quant
82 BC-0.5 1996-06-02 SO4 194.00
83 BC-0.5 1996-06-02 TDS 530.00
6903 BC-2 1994-07-25 Cond 826.00
6905 BC-4 1996-08-23 SO4 36.00
6977 BC-2 1994-10-19 Cond 848.00
6980 BC-2 1995-03-16 Cond 1795.00
6983 BC-2 1995-06-21 Cond 640.00
7833 BC-3 1994-01-20 Cond 406.00
7838 BC-3 1994-02-17 Cond 401.00
7847 BC-3 1994-03-24 Cond 441.00
7854 BC-3 1994-06-13 Cond 400.00
7866 BC-3 1994-07-25 Cond 393.00
7871 BC-3 1994-08-18 Cond 420.00
7877 BC-3 1994-10-20 Cond 438.00
Perhaps because it's Monday I'm not successfully writing the xyplot()
command to show the quant, for example, for TDS by site. What I need to do
is plot the quant values for TDS vs. Cond, TDS vs. SO4, etc.
Have I incorrectly subset the data? I know that I've missed something but
cannot determine what it is.
Rich
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