事前じぜん確率かくりつ分布ぶんぷではありませんでした
jizenkakuritsubumpudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 事前確率分布

1. It was not a prior probability distribution.

Past/Perfective
Negative
Polite
Formal Register
Mathematics