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null
pseudo-types used in this documentation
最后更新: 2011-10-24
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$var = null;
see also is_null() and unset().
最后更新: 2011-10-24
使用频率: 1
质量:
most statisticians believe that it is valid to state direction as a part of null hypothesis, or as part of a null hypothesis/alternative hypothesis pair.
most statisticians believe that it is valid to state direction as a part of null hypothesis, or as part of a null hypothesis/alternative hypothesis pair.
according to this view, the null hypothesis must be numerically exact—it must state that a particular quantity or difference is equal to a particular number.
according to this view, the null hypothesis must be numerically exact—it must state that a particular quantity or difference is equal to a particular number.