In its three-grade rating system , the research institute assigns a " 2 " rating to issues whose values it sees moving within 10 percentage points in either direction of the key 225-share Nikkei average over the next six months .
<response> In its three-grade rating system , the research institute assigns a " 2 " rating to issues whose values it sees moving within 10 percentage points in either direction of the key 225-share <misc>Nikkei</misc> average over the next six months . </response>