Open Access



相关系数范围 判定结论
0≤|rmn|<0.1 变量XmXn无相关
0.1≤|rmn|<0.3 变量XmXn存在弱相关
0.3≤|rmn|<0.5 变量XmXn存在中等相关
0.5≤|rmn|<1 变量XmXn存在强相关

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

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