[R] sorting means for plot in descending order

[peter dalgaard]

> On 09 Apr 2015, at 08:11 , Luis Fernando García <luysgarcia at gmail.com> wrote:
> 
> Dear R experts,
> 
> I am newbie on the R use, now I want to sort my data by mean in a
> descending and not acending order (like I have done so far).  If any of you
> could help me with this, it would be really appreciated!

How about replacing "mean" with "function(x) -mean(x)" ?

-pd 

> 
> Thanks!
> 
> 
> Please find the script attached with the summary of the dat object
> 
> 
> pt<-summarySE(dat, measurevar="Time", groupvars=("Prey"))#
> 
> pt
> 
>   Prey  N     Time       sd       se       ci
> 1 cochinilla 10 351.6000 99.34103 31.41439 71.06429
> 2    hormiga 17 193.2353 92.50014 22.43458 47.55918
> 3      larva 18 259.0667 93.84009 22.11832 46.66558
> 4    termita 19 144.6316 65.30895 14.98290 31.47791
> 
> pt$Prey=c("Isopoda","Formicidae","Lepidoptera","Isoptera")
> 
> bymean <- with(pt, reorder(Prey, Time, mean))# REordenar por promedio
> 
> 
> library(ggplot2)
> 
> png(filename = "plotloxo1.png", width = 500, height = 500)
> 
> e <- qplot(bymean, pt$Time,size=3)+theme(panel.grid.major =
> element_blank(), panel.grid.minor = element_blank(),
>                                           panel.background =
> element_blank(), axis.line = element_line(colour = "black"))#
> 
> 
> e<-e+theme(legend.position="none")#
> e+  geom_errorbar(data = pt, aes(x = pt$Prey, y = pt$Time, ymin = pt$Time -
> pt$ci, ymax = pt$Time + pt$ci),
>                  colour = "black", width = 0.4, size=0.5)+ #Añadir barras
> de error
>  xlab("Prey") +
>  ylab("Time (Seconds)") +
>  ggtitle("Total PM25 emissions")
> 
> dev.off()#
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com