[R] Descriptive Stats from Data Frame

[David Winsemius]

On Aug 30, 2011, at 5:38 PM, Rich Shepard wrote:

> On Tue, 30 Aug 2011, David Winsemius wrote:
>
>> I think you need to go back and do your input operations again with
>> sep="|"
>
> David,
>
>  Yes, that's better. I did not know of the sep option. The new  
> results:
>
>> str(chemdata)
> 'data.frame':   14886 obs. of  4 variables:
> $ site_id    : Factor w/ 148 levels "BC-0.5","BC-1",..: 104 145 126  
> 115 114
> 128 124 2 3 3 ...
> $ sample_date: Factor w/ 1012 levels "1980-03-01","1980-05-01",..:  
> 432 410
> 423 405 398 408 401 360 366 407 ...
> $ param      : Factor w/ 8 levels "Arsenic","Calcium",..: 1 1 1 1 1  
> 1 1 1 1
> 1 ...
> $ quant      : num  0.06 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01  
> 0.01 ...
>
>  Now I can work on the commands I need.

That does look more workable. You might consider changing the dates  
with:

chemadata$samp_date <- as.Date(as.character(chemdata$sample_date) )


>
> Many thanks,
>
> Rich
>
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David Winsemius, MD
West Hartford, CT