变量 | 处理 | 均值 | 偏差率(%) | 偏差降低比率(%) | T-test | ||
处理组 | 对照组 | t | P > |t| | ||||
soe | 匹配前 | 0.398 | 0.495 | −19.4 | 100.0 | −2.11 | 0.035 |
匹配后 | 0.401 | 0.401 | 0.0 | −0.00 | 1.000 | ||
size | 匹配前 | 22.705 | 22.508 | 16.9 | 29.8 | 1.91 | 0.057 |
匹配后 | 22.689 | 22.551 | 11.8 | −0.97 | 0.334 | ||
flow | 匹配前 | 0.559 | 0.474 | 11.8 | 23.0 | 1.33 | 0.184 |
匹配后 | 0.557 | 0.491 | 9.1 | 0.75 | 0.457 | ||
age | 匹配前 | 12.587 | 11.133 | 23.2 | 93.0 | 2.56 | 0.011 |
匹配后 | 12.526 | 12.423 | 1.6 | 0.13 | 0.895 | ||
first | 匹配前 | 39.243 | 36.189 | 20.2 | 98.1 | 2.25 | 0.025 |
匹配后 | 39.197 | 39.255 | −0.4 | −0.03 | 0.976 | ||
leve | 匹配前 | 0.464 | 0.501 | −17.6 | 66.4 | −1.95 | 0.052 |
匹配后 | 0.463 | 0.450 | 5.9 | 0.50 | 0.617 | ||
roa | 匹配前 | 0.047 | 0.052 | −3.5 | −15.4 | −0.39 | 0.699 |
匹配后 | 0.049 | 0.043 | 4.0 | 0.36 | 0.719 | ||
board | 匹配前 | 2.116 | 2.154 | −22.0 | 63.8 | −2.48 | 0.013 |
匹配后 | 2.117 | 2.103 | 8.0 | 0.65 | 0.518 | ||
cash | 匹配前 | 7.039 | 7.107 | −10.1 | 86.6 | −1.13 | 0.258 |
匹配后 | 7.042 | 7.033 | 1.4 | 0.11 | 0.912 |