Nikkei up in choppy trade as uncertainty grips market before BOJ
* Outperforming Topix 30 triggers pension buying speculation
* Short-sell ratio relatively high
* Takata dives on report bidders consider possibility of some form of bankruptcy proceedings
By Ayai Tomisawa
TOKYO, Sept 20 (Reuters) - Japanese stocks rose in choppy trade on Tuesday morning as investors counted down to this week's Bank of Japan policy decision amid speculation the central bank will make crucial changes to its massive easing programme.
There is talk the BOJ could make negative interest rates the primary focus of its monetary policy on Wednesday as policy makers seek new ways to stoke stubbornly low inflation and growth.
The uncertainty around the BOJ's decision has kept markets on edge on top of the looming outcome of the Federal Reserve's review which also falls on Wednesday.
"The market is more nervous about the BOJ than the Fed as it may give a surprise," said Yutaka Miura, a senior technical analyst at Mizuho Securities.
He noted the market consensus for the Fed is for rates to stay on hold. Continuación...