Which estimator is positive semi-deﬁnite? 未知类型：{'options': ['long run variance-covariance estimator [img=11x24]17de8379772258d.png[/img]=[img=51x65]17de837982326d0.png[/img]([img=17x47]17de83798f44d1a.png[/img])[img=12x24]17de83799af1362.png[/img](j)', 'OLS', 'Newey and West (1987) HAC estimator', 't test statistic'], 'type': 102}

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2022-06-01

Which estimator is positive semi-deﬁnite? 未知类型：{'options': ['long run variance-covariance estimator [img=11x24]17de8379772258d.png[/img]=[img=51x65]17de837982326d0.png[/img]([img=17x47]17de83798f44d1a.png[/img])[img=12x24]17de83799af1362.png[/img](j)', 'OLS', 'Newey and West (1987) HAC estimator', 't test statistic'], 'type': 102}

Which estimator is positive semi-deﬁnite?
未知类型：{'options': ['long run variance-covariance estimator [img=11x24]17de8379772258d.png[/img]=[img=51x65]17de837982326d0.png[/img]([img=17x47]17de83798f44d1a.png[/img])[img=12x24]17de83799af1362.png[/img](j)', 'OLS', 'Newey and West (1987) HAC estimator', 't test statistic'], 'type': 102}

答案：

C

举一反三

内容

0
求[img=143x21]17e440eb5976ae1.jpg[/img]的定义域未知类型：{'options': ['', ' [img=38x33]17e440eb6bdd78b.jpg[/img]', ' 0<;x', ' 0<;x<;1'], 'type': 102}
1
函数f(x)=[img=40x76]17e0bf8d391c13e.png[/img]的不连续点为( ) 未知类型：{'options': ['x=0', ' x=[img=43x39]17e0bf8d4513730.png[/img](k=0,±1,±2,…)', ' x=0和x=2kπ(k=0,±1,±2,…)', ' x=0和x=[img=43x39]17e0bf8d4513730.png[/img](k=0,±1,±2,…)'], 'type': 102}
2
曲线[img=67x36]17e0bf1edc6c43d.jpg[/img]的垂直渐渐线是未知类型：{'options': ['x=-1', ' x=1', ' [img=46x17]17e0b27b23c7e52.jpg[/img]', ' x=0'], 'type': 102}
3
函数[img=66x42]17da596c7940046.png[/img]的无穷间断点是( ) 未知类型：{'options': ['x=1', ' x=e', ' x=0', ' x=[img=24x21]17da596c93f3867.png[/img]'], 'type': 102}
4
以下4个集合中是空集的是() 未知类型：{'options': ['{X|[img=28x38]17da5873b8265d2.png[/img]-1=0}', ' {X|X-1=0}', ' {X|[img=28x39]17da5873d47c123.png[/img]=0}', ' {X|[img=28x39]17da5873d47c123.png[/img]+1=0}'], 'type': 102}