[R] Syntax Help for xyplot()

[B77S]

Why not format the data like this:
site sampledate SO4 TDS NA Mg Cond Cl Ca
 
i.e. with a column for each parameter?

It seems to me that you summary doesn't make any sense.  Those quantiles are
meaningless as they encompass all the parameters.  Am I missing something?




Rich Shepard wrote:
> 
> 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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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
> 


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