Table 3 Comparison of variables before and after matching.
Variable | Sample matching | Mean | Standard deviation | Reduction in standard deviation | T-test | ||
|---|---|---|---|---|---|---|---|
Treatment group | Control group | t-value | p-value | ||||
Lev | Before Matching | 0.53 | 0.50 | 16.90 | 75.30 | 5.69 | 0.00 |
After Matching | 0.53 | 0.54 | −4.20 | −1.08 | 0.28 | ||
ROA | Before Matching | 0.04 | 0.05 | −14.80 | 74.10 | −5.06 | 0.00 |
After Matching | 0.04 | 0.04 | 3.80 | 1.03 | 0.30 | ||
Growth | Before Matching | 0.23 | 0.36 | −13.70 | 79.70 | −4.60 | 0.00 |
After Matching | 0.23 | 0.26 | −2.80 | −0.77 | 0.44 | ||
Size | Before Matching | 23.66 | 23.12 | 34.40 | 86.80 | 12.38 | 0.00 |
After Matching | 23.64 | 23.71 | −4.50 | −1.14 | 0.26 | ||
Age | Before Matching | 2.54 | 2.38 | 23.50 | 99.80 | 7.66 | 0.00 |
After Matching | 2.54 | 2.54 | 0.00 | −0.01 | 0.99 | ||
Sen | Before Matching | 0.83 | 0.53 | 66.00 | 93.60 | 20.92 | 0.00 |
After Matching | 0.82 | 0.81 | 4.20 | 1.24 | 0.21 | ||
Largest | Before Matching | 44.07 | 37.08 | 42.30 | 87.80 | 15.27 | 0.00 |
After Matching | 43.87 | 44.72 | −5.10 | −1.30 | 0.20 | ||
