Brilliant, thanks very much!! Works fine.

Dan
On 6 Dec 2012, at 18:25, arun kirshna [via R] wrote:

> Hi, 
> Your question is not very clear.  I hope you are not looking for the subset option in summary(lm()). 
> If you want just the summary(),  then use '&' or '|' 
> For e.g. 
> dat1<-read.table(text=" 
> opcorn   Oilamt   Batch        Yield 
> plain	      little	      large	         8.2 
> gourmet     little	      large	         8.6 
> plain	      lots	      large	       10.4 
> gourmet     lots	      large	         9.2 
> plain	      little	      small         9.9 
> gourmet    little	      small	       12.1 
> plain	      lots	      small       10.6 
> gourmet    lots	      small	       18.0 
> plain	      little	      large	       8.8 
> gourmet    little	      large        8.2 
> plain	      lots	      large	       8.8 
> gourmet    lots	      large        9.8 
> plain	     little	      small	      10.1 
> gourmet   little	     small	     15.9 
> plain	    lots	     small        7.4 
> gourmet   lots	     small	     16.0 
> ",sep="",header=TRUE) 
> dat1$Yield[dat1$opcorn=="gourmet"&dat1$Oilamt=="lots"] 
> #[1]  9.2 18.0  9.8 16.0 
>  summary(dat1$Yield[dat1$opcorn=="gourmet"&dat1$Oilamt=="lots"]) 
> #   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
> #   9.20    9.65   12.90   13.25   16.50   18.00 
>  summary(dat1$Yield[dat1$opcorn=="gourmet"|dat1$Oilamt=="lots"]) 
> #   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
>   # 7.40    8.75   10.10   11.25   13.05   18.00 
> A.K. 
> 
> 
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