Nothing
MW=function(data,group){
n=tapply(data, group, length)
k=length(tapply(data, group, length))
xbar=tapply(data, group, mean)
var=tapply(data, group, var)
c=(n-1)/(n-3);
w=n/(c*var);
h=w/sum(w);
AWT1=sum(w*(xbar-sum(h*xbar))^2);
AWT2=(k-1)+((2*((k-2)/(k+1))*sum((1-h)^2/(n-1))));
AWT=AWT1/AWT2;
df=((k^2-1)/3)/sum((1-h)^2/(n-1));
pvalue=1-pf(AWT,k-1,df);
result=matrix(c(round(AWT,digits=4),round(df),round(pvalue,digits=4)))
rownames(result)=c("Test Statistic","df","p-value")
colnames(result)=c("Modified Welch")
return(t(result))
}
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