-
-
Save ramnathv/6076268 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
## Corey Chivers, 2012 ## | |
sim_bayes<-function(p=0.5,N=100,y_lim=20,a_a=2,a_b=10,b_a=8,b_b=3) | |
{ | |
## Simulate outcomes in advance | |
outcomes<-sample(1:0,N,prob=c(p,1-p),replace=TRUE) | |
success<-cumsum(outcomes) | |
for(frame in 1:N) | |
{ | |
png(paste("plots/",1000+frame,".png",sep="")) | |
curve(dbeta(x,a_a,a_b),xlim=c(0,1),ylim=c(0,y_lim),col='green',xlab='p',ylab='Posterior Density',lty=2) | |
curve(dbeta(x,b_a,b_b),col='blue',lty=2,add=TRUE) | |
for(i in 1:frame) | |
{ | |
curve(dbeta(x,a_a+success[i]+1,a_b+(i-success[i])+1),add=TRUE,col=rgb(0,100,0,(1-(frame-i)/frame) * 100,maxColorValue=255)) | |
curve(dbeta(x,b_a+success[i]+1,b_b+(i-success[i])+1),add=TRUE,col=rgb(0,0,100,(1-(frame-i)/frame) * 100,maxColorValue=255)) | |
} | |
curve(dbeta(x,a_a+success[i]+1,a_b+(i-success[i])+1),add=TRUE,col=rgb(0,100,0,255,maxColorValue=255),lwd=2) | |
curve(dbeta(x,b_a+success[i]+1,b_b+(i-success[i])+1),add=TRUE,col=rgb(0,0,100,255,maxColorValue=255),lwd=2) | |
legend('topleft',legend=c('Observer A','Observer B'),lty=1,col=c('green','blue')) | |
text(0.75,17,label=paste(success[i],"successes,",i-success[i],"failures")) | |
dev.off() | |
} | |
system('mencoder mf://plots/*.png -mf fps=15:type=png -ovc copy -oac copy -o plots/output.avi') | |
} | |
sim_bayes() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment