[R] Qurey : How to add trendline( st. line) in Graph

[Petr Pikal]

Hi

maybe
abline(0,1)

HTH
Petr

On 19 Jun 2006 at 16:22, priti desai wrote:

Date sent:      	Mon, 19 Jun 2006 16:22:24 +0530
From:           	"priti desai" <priti.desai at kalyptorisk.com>
To:             	<r-help at stat.math.ethz.ch>
Subject:        	[R] Qurey : How to add trendline( st. line)  in Graph

> How to add trendline (i.e. straight line passing through maximum
> points) in graph. I have worked on the data given below. Please tell
> me how to add trendline in the graph.
> 
> The script is as follows
> 
> =================================== start
> ====================================================
> 
> # The data is as follows
> 
> data <- c( 0.01,  0.02, 0.04, 0.13,  0.17 , 0.19 , 0.21 , 0.27 , 0.27
> , 0.28,  0.29,  0.37,
>            0.41,  0.49,  0.51,  0.52,  0.54,  0.57,  0.62,  0.63, 
>            0.68,
> 0.73,  0.74, 0.79,
>            0.81,  0.81,  0.82,  0.86,  0.94,  0.96,  1.02,  1.10, 
>            1.10,
> 1.20,  1.29,  1.36,
>            1.40,  1.41,  1.44,  1.45,  1.62,  1.67,  1.69,  1.78, 
>            1.82,
> 2.11,  2.13,  2.14,
>            2.24,  2.29,  2.34, 2.40,  2.46,  2.70,  2.83,  2.98, 
>            3.00,
> 3.30,  3.53,  3.70,
>            3.86,  3.90,  3.91,  3.98,  5.01,  5.23,  6.05,  6.12,
>            10.41,
> 10.73)
> 
> # P-P plot
> average       <- mean(data)  
> lambda        <- (1/average)
> e             <- c(1:70)
> f             <- c((e-.5)/70)
> Fx            <- c(1 - exp(-lambda*data))
> g             <- sort(Fx)
> plot(f,g)
> 
> ===================================== end
> ====================================================
> 
> Awaiting your positive reply.
> 
> Regards.
> Priti.
> 
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Petr Pikal
petr.pikal at precheza.cz