A Systems View Across Time and Space
 | EEI | EE | PE | EM | PF | PU | TI |
---|---|---|---|---|---|---|---|
EEI | Â | Â | Â | Â | Â | Â | Â |
EE | 0.578 | Â | Â | Â | Â | Â | Â |
PE | 0.507 | 0.658 | Â | Â | Â | Â | Â |
EM | 0.847 | 0.597 | 0.600 | Â | Â | Â | Â |
PF | 0.682 | 0.815 | 0.793 | 0.680 | Â | Â | Â |
PU | 0.550 | 0.575 | 0.708 | 0.594 | 0.570 | Â | Â |
TI | 0.488 | 0.500 | 0.540 | 0.711 | 0.495 | 0.674 | Â |