Nothing

```
# (C) 2008-2012 Leo Lahti and Olli-Pekka Huovilainen
# All rights reserved.
# FreeBSD License (keep this notice)
# "The important thing in science is not so much to obtain new facts as
# to discover new ways of thinking about them."
# - Sir William Bragg
dependency.score <- function ( model ) {
# (C) 2008-2012 Leo Lahti and Olli-Pekka Huovilainen
# All rights reserved.
# FreeBSD License (keep this notice)
W <- model$W
phi <- model$phi
if (!is.null(W$X)){
# this equals to the trace of the full Phi
noise <- sum(diag(as.matrix(phi$X))) + sum(diag(as.matrix(phi$Y)))
W$total <- rbind(W$X, W$Y)
} else {
# For single data case, check proportion between
# latent covariance and expected diagonal noise
noise <- sum(diag(as.matrix(phi$total)))
}
signal <- sum( diag(W$total %*% t(W$total)) ) # trace of full WWt covariance
return( signal/noise )
}
```

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