6. What events marked the end of the Soviet Union?

On December 25, 1991, the Soviet hammer and sickle flag lowered for the last time over the Kremlin, thereafter replaced by the Russian tricolor. Earlier in the day, Mikhail Gorbachev resigned his post as president of the Soviet Union, leaving Boris Yeltsin as president of the newly independent Russian state.

Explanation:

there is no universal method for handling incomplete data in a clinical trial. each trial has its own set of design and measurement characteristics. there is, however, a set of six principles that can be applied in a wide variety of settings.