Reader Eric Worrall writes:
I was playing with Wood For Trees, looking at the relationship between Pacific Decadal Oscillation vs global temperature (Hadcrut 4), when the following graph appeared.
The interesting thing is PDO in this graph appears to have predictive skill for changes in global temperature – the changes in PDO appear to match changes in global temperature, once the graphs are normalised, but temperature lags PDO by around 5 years.
Is it all just coincidence? Bad endpoint choice? Or does it in fact have some predictive value?
Readers are invited to weigh in.