变量 | 均值 | 标准偏差(%) | 标准偏差减 少幅度(%) | t检验 | t检验相伴 概率值 | |||
处理组企业 | 对照组企业 | t | p > |t| | |||||
roa | 匹配前 | 5.3275 | 4.8564 | 6.4 | 3.14 | 0.002 | 0.85* | |
匹配后 | 5.3275 | 5.291 | 0.5 | 92.3 | 0.21 | 0.837 | 0.87* | |
debttoassets | 匹配前 | 37.79 | 40.512 | −13.5 | −6.57 | 0.000 | 0.86* | |
匹配后 | 37.79 | 37.58 | 1 | 92.3 | 0.45 | 0.656 | 0.99 | |
ca | 匹配前 | 0.05628 | 0.11249 | −6.5 | −2.67 | 0.008 | 0.00* | |
匹配后 | 0.05628 | 0.05371 | 0.3 | 95.4 | 1.93 | 0.053 | 0.65* | |
age | 匹配前 | 18.479 | 17.35 | 19.6 | 10.20 | 0.000 | 1.48* | |
匹配后 | 18.479 | 18.412 | 1.2 | 94.1 | 0.47 | 0.636 | 1.44* | |
indnum | 匹配前 | 0.0743 | 0.0726 | 5.7 | 2.47 | 0.014 | 0.18* | |
匹配后 | 0.0743 | 0.07473 | −1.5 | 74.5 | −0.54 | 0.589 | 0.15* | |
InGDP | 匹配前 | 10.563 | 10.364 | 28.6 | 13.61 | 0.000 | 0.68* | |
匹配后 | 10.563 | 10.55 | 1.8 | 93.8 | 0.80 | 0.423 | 0.97 |