R help - Mar 2011 - displaying label meeting condition (i.e. significant, i..e p value less than 005) in plot function

Dear R users,
 
Here is my problem:
 
# example data
name <- c(paste ("M", 1:1000, sep = ""))
xvar <- seq(1, 10000, 10)
set.seed(134)
p <- rnorm(1000, 0.15,0.05)
dataf <- data.frame(name,xvar, p)
plot (dataf$xvar,p)
abline(h=0.05)
 
# I can know which observation number is less than 0.05 
which (dataf$p < 0.05) 
[1]  12  20  80 269 272 338 366 368 397 403 432 453 494 543 592 691 723 789
811
[20] 854 891 931 955
 
I want to display (label) corresponding names on the plot above: 
means that 12th observation M12, 20th observation M20 and so on. Please note
that I have names not in numerical sequience (rather different names), just
provided for this example to create dataset easily.
 
Thanks in advance
 
Umesh R
 

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Hi Umesh,

You can try something along the lines of:

d <- dataf[dataf$p < 0.05, ]   # p < 0.05
with(d, plot(xvar, p, col = 'white'))
with(d, text(xvar, p, name, cex = .7))

HTH,
Jorge



On Sat, Mar 5, 2011 at 12:29 PM, Umesh Rosyara <> wrote:
> Dear R users,
>
> Here is my problem:
>
> # example data
> name <- c(paste ("M", 1:1000, sep = ""))
> xvar <- seq(1, 10000, 10)
> set.seed(134)
> p <- rnorm(1000, 0.15,0.05)
> dataf <- data.frame(name,xvar, p)
> plot (dataf$xvar,p)
> abline(h=0.05)
>
> # I can know which observation number is less than 0.05
> which (dataf$p < 0.05)
> [1]  12  20  80 269 272 338 366 368 397 403 432 453 494 543 592 691 723 789
> 811
> [20] 854 891 931 955
>
> I want to display (label) corresponding names on the plot above:
> means that 12th observation M12, 20th observation M20 and so on. Please
> note
> that I have names not in numerical sequience (rather different names), just
> provided for this example to create dataset easily.
>
> Thanks in advance
>
> Umesh R
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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