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BF=function(data,group){
n=tapply(data, group, length)
k=length(tapply(data, group, length))
xbar=tapply(data, group, mean)
var=tapply(data, group, var)
B=sum(n*(xbar-mean(data))^2)/sum((1-(n/sum(n)))*var);
df1=sum((1-(n-sum(n)))*var)^2;
df2=sum(((1-(n-sum(n)))^2*(var)^2)/(n-1));
df=(df1/df2);
pvalue=1-pf(B,k-1,df);
result=matrix(c(round(B,digits=4),round(k-1),round(pvalue,digits=4)))
rownames(result)=c("Test Statistic","df","p-value")
colnames(result)=c("Brown-Forsythe")
return(t(result))
}
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