And estimated the unknown quantity using the methods of least square estimation and local polynomial estimation, obtained the consistency of estimation under certain condition.

在半参数回归模型中采用最小二乘估计方法结合局部多项式方法来估计未知量，在一定条件下得到了估计量的相合性。

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"It'll be a British style game and it's not the unknown quantity we could have had, " he added.

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Rangers, in pot two, could have faced any of the English clubs but appear to have been handed a relatively favourable draw that includes the unknown quantity of Unirea Urziceni.

BBC: British clubs avoid Euro giants

They have a tough group with the world champions - and in my opinion the best team in the world - Brazil, a brave and physical Norwegian side and the unknown quantity of Morocco.

BBC: Confidence is key for Scotland