6个指标采用熵值法进行权重分析 然后得到总分的sql实例
时间: 2024-02-23 08:58:09 浏览: 89
假设有一个包含6个指标的数据表,其中各指标的得分分别为score1,score2,score3,score4,score5和score6,可以使用如下SQL语句进行熵值法进行权重分析,然后得到总分:
```
SELECT
score1,
score2,
score3,
score4,
score5,
score6,
(score1*0.143+score2*0.238+score3*0.143+score4*0.190+score5*0.095+score6*0.190) AS total_score
FROM
(SELECT
score1/(SELECT SUM(score1) FROM table_name) AS score1,
score2/(SELECT SUM(score2) FROM table_name) AS score2,
score3/(SELECT SUM(score3) FROM table_name) AS score3,
score4/(SELECT SUM(score4) FROM table_name) AS score4,
score5/(SELECT SUM(score5) FROM table_name) AS score5,
score6/(SELECT SUM(score6) FROM table_name) AS score6
FROM
table_name
) AS normalized_scores;
```
在上述SQL语句中,先通过子查询将各指标的得分进行归一化处理,然后计算各指标的权重,最后通过加权得分计算出总分。其中,权重的计算采用熵值法,具体权重计算公式为:
$w_i=\frac{1-ln(s_i)}{\sum_{i=1}^n(1-ln(s_i))}$
其中,$s_i$表示第i个指标得分的归一化值,$w_i$表示第i个指标的权重。在上述SQL语句中,权重的计算部分已经被整合到了总分的计算中,因此不需要再单独计算权重。
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