They then look at how those various Price-to-Book ratios relate to forward 1-year returns....In short, it looks good.
Although I don't like that the 1-year forward returns only use 1999 to today. Why not use the same data as the first graph back to 1993? Also, I don't tend to think any valuation metric is a reliable short-term (1 year) timing indicator. However, Rob Arnott has also been pointing out that longer-term forward returns (10 years) are also looking pretty tempting using a Shiller PE ratio. All I know is, anything looks good 'relative' to the US right now.