r - Plotting RDA (vegan) in ggplot -

i'm still new r, trying learn how use library vegan, can plot in r normal plot function. problem arises when want plot data in ggplot. know have extract right data list i've created, , how? dataset i've been practicing on can downloaded here https://drive.google.com/file/d/0b1pqgov60aoudvr3dvzbx1vkahc/view?usp=sharing code i've been using data transformed this:

library(vegan) library(dplyr) library(ggplot2) library(grid) data <- read.csv(file = "people.csv", header = t, sep = ",", dec = ".", check.names = f, na.strings=c("na", "-", "?")) data2 <- data[,-1] rownames(data2) <- data[,1] data2 <- scale(data2, center = t, scale = apply(data2, 2, sd)) data2.pca <- rda(data2) 

which gives me list can plot using basic "plot" , "biplot" function, @ loss how plot both pca , biplot in ggplot. color data points group, e.g. sex. great.

there ggbiplot(...) function in package ggbiplot, works objects of class prcomp, princomp, pca, or lda.

plot.rda(...) locates each case (person) in pc1 - pc2 space. biplot.rda(...) adds vectors pc1 , pc2 loadings each variable in original dataset. turns out plot.rda(...) , biplot.rda(...) use data produced summarizing rda object, not rda object itself.

smry <- summary(data2.pca) df1  <- data.frame(smry$sites[,1:2])       # pc1 , pc2 df2  <- data.frame(smry$species[,1:2])     # loadings pc1 , pc2 rda.plot <- ggplot(df1, aes(x=pc1, y=pc2)) +    geom_text(aes(label=rownames(df1)),size=4) +   geom_hline(yintercept=0, linetype="dotted") +   geom_vline(xintercept=0, linetype="dotted") +   coord_fixed() rda.plot 

rda.biplot <- rda.plot +   geom_segment(data=df2, aes(x=0, xend=pc1, y=0, yend=pc2),                 color="red", arrow=arrow(length=unit(0.01,"npc"))) +   geom_text(data=df2,              aes(x=pc1,y=pc2,label=rownames(df2),                 hjust=0.5*(1-sign(pc1)),vjust=0.5*(1-sign(pc2))),              color="red", size=4) rda.biplot 

if compare these results plot(data2.pca) , biplot(data2.pca) think you'll see same. believe or not hardest part, far, getting text align wrt arrows.