Nothing

```
###########################
## Compute the implicative statistic of a rule
###########################
implicativestat <- function(x, y, type="intensity", resid="standard") {
if (!(type %in% c("intensity", "indice"))) {
stop("type should be intensity or indice")
}
if (!(resid %in% c("standard", "deviance", "Freeman-Tukey", "adjusted"))) {
stop("resid should be one of standard, deviance, Freeman-Tukey or ajusted")
}
x <- factor(x)
if (length(levels(x)==1)) x <- factor(x, levels=c("0","1"))
y <- factor(y)
if (length(levels(y)==1)) y <- factor(y, levels=c("0","1"))
xgrp <- levels(x)
ygrp <- levels(y)
result <- matrix(0, nrow=length(xgrp), ncol=length(ygrp))
n <- length(x)
rownames(result) <- xgrp
colnames(result) <- ygrp
for (i in 1:length(xgrp)) {
condi <- x==xgrp[i]
for (j in 1:length(ygrp)) {
condj <- y==ygrp[j]
Nnbj <- sum((condi)&!condj)
Nexpnbj <- sum(condi)*sum(!condj)/n
if (resid=="standard") {
indice <- (Nnbj-Nexpnbj)/sqrt(Nexpnbj)
}
else if (resid=="deviance") {
indice <- sign(Nnbj-Nexpnbj)*sqrt(abs(2*Nnbj*log(Nnbj/Nexpnbj)))
}
else if (resid=="Freeman-Tukey") {
indice <- sqrt(Nnbj)+sqrt(1+Nnbj)-sqrt(4*Nexpnbj+1)
}
else if (resid=="adjusted") {
indice <- (Nnbj-Nexpnbj)/sqrt(Nexpnbj*(sum(condj)/n)*(1-sum(condi)/n))
}
if (type=="indice") {
result[i, j] <- indice
}
else {
result[i, j] <- pnorm(-indice)
}
}
}
return(result)
}
```

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