Adding a bit of formatting
Where your data is dat1
dat1$reference <- factor(dat1$reference, levels =
dat1$reference[order(dat1$year)])
pp2 <- ggplot(dat1, aes( reference, size)) + geom_bar( stat = "identity") +
coord_flip()
pp2 <- pp2 + ggtitle("Studies with Cross-sectional estimates") +
xlab("") + ylab("Total Number of Subjects")
pp2
John Kane
Kingston ON Canada
> -----Original Message-----
> From: antovi...@gmail.com
> Sent: Sat, 30 May 2015 14:01:28 +0200
> To: r-help@r-project.org
> Subject: [R] metagen - plotStudySizes: order by year and not alphabetical
>
> HI everybody.
> I'm using the package 'metagen' to plot sample size in meta-analysis.
> The plot function of the package reorders the studies by alphabetcial
> order.
> However, I would like to have the studies listed by year.
> How can I force the plotting function to order the study by the variable
> 'year' rather than by the first initial of the variable 'reference'?
>
> Thank you in advance,
> Antonello
>
> Here my sample code:
>
>
> ### the data
>
> df <- structure(list(reference = structure(c(3L, 6L, 9L, 2L, 8L, 5L,
> 7L, 10L, 4L, 1L), .Label = c("Bellani et al. 2012 ",
> "Bocco et al. 2004 ", "Costa 1998 ",
> "Dalla Volta et al. 2011 ", "Manzanere et al. 2006
> ",
> "McEnty et al. 2001 ", "Ossian et al. 2006 ",
> "Simone et al. 2004 ", "Tanter et al. 2002 ",
> "Zimmian et al. 2006 "), class = "factor"), size = c(20,
> 288, 70, 138, 475, 191, 918, 80, 508, 205), year = c(1998, 2001,
> 2002, 2004, 2004, 2006, 2006, 2006, 2011, 2012)), .Names = c("reference",
> "size", "year"), class = "data.frame", row.names = c(NA, -10L
> ))
>
> ### a quick look at the data
>
> head(df)
> str(df)
>
> ### the library
>
> library(metagen); library(ggplot2)
>
> ### the plot
>
> p1 <- plotStudySizes(df)
> p1 <- p1 + ggtitle("Studies with Cross-sectional estimates")
> p1
>
> [[alternative HTML version deleted]]
>
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