以下是我的数据格式。其中，a是因变量，为无序三分类变量；b是中介变量，为二分类变量；c是自变量，为连续变量；d是控制变量。请问我该如何实现中介效应分析呢？
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| a | b | c | d |
1 | 0 | 3 | 1 |
1 | 0 | 4.8 | 0 |
1 | 1 | 2.95 | 0 |
1 | 0 | 4.8 | 0 |
0 | 1 | 3.7 | 0 |
0 | 0 | 3 | 0 |
1 | 0 | 1.9 | 0 |
1 | 1 | 3.3 | 0 |
0 | 1 | 2.75 | 1 |
1 | 1 | 2.6 | 0 |
0 | 0 | 4.6 | 0 |
0 | 0 | 2.8 | 0 |
0 | 0 | 2.1 | 0 |
1 | 0 | 2.15 | 1 |
1 | 0 | 4.3 | 0 |
0 | 1 | 3 | 0 |
1 | 0 | 3.45 | 0 |
2 | 0 | 2.1 | 1 |
1 | 1 | 2.9 | 1 |
1 | 0 | 2.9 | 0 |
0 | 0 | 4.8 | 0 |
1 | 0 | 2.15 | 0 |
0 | 1 | 2.5 | 1 |
0 | 0 | 3.9 | 0 |
0 | 0 | 4.5 | 0 |
1 | 0 | 4 | 0 |
1 | 1 | 2.3 | 1 |
1 | 1 | 2.3 | 0 |
0 | 0 | 4.12 | 0 |
0 | 1 | 3.54 | 0 |
1 | 0 | 2.5 | 0 |
1 | 0 | 2.1 | 1 |
1 | 0 | 2.5 | 0 |
1 | 0 | 3.75 | 1 |
1 | 0 | 2.5 | 0 |
0 | 0 | 3 | 0 |
1 | 1 | 2.02 | 0 |
1 | 0 | 3.75 | 0 |
1 | 0 | 2.31 | 1 |
1 | 0 | 2.55 | 0 |
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