假定的

(a) As has been mentioned, some postulated that phlogiston has negative weight (levity).

(a) 正如所提到那样，某些燃素会减轻（轻率）。

A scientist never presupposes the truth of an unproved fact.

科学家从不预先未经证实事实。

So it is very indispensable to revaluate the rear hypothesis of the present capital market theory.

因此，重新估价当今资本市后是十分重要。

Your assumption is wrong.

你是错。

In the fitting methods of both the ordinary nonparametric regression models and the varying coefficient regression models, the error term of the models is usually assumed to be homoscedastic.

在以上这些回归模型拟合方法中，通常模型误差是等方差。