ATT and estimated probabilities using different propensity score matching methods
| Variable | Optimal | Nearest neighbor with caliper | Nearest neighbor without replacement | Nearest neighbor with replacement | Exact | Coercion | Genetic |
|---|---|---|---|---|---|---|---|
| Matched observations | 489 | 467 | 489 | 489 | 360 | 243 | 489 |
| Covariate balance | Balanced | Balanced | Balanced | Balanced | Balanced | Balanced | Balanced |
| Average treatment effect on the treated | |||||||
| Average contract duration | 106.72*** (20.97) | 101.70*** (21.44) | 99.67*** (22.90) | 108.75*** (21.03) | 50.12 (22.51) | 39.77 (29.03) | 65.24*** (21.93) |
| Avg. Monthly Salary 2017 | 174.67*** (39.00) | 141.60*** (40.36) | 146.65*** (42.17) | 151.32*** (39.24) | 22.82 (42.94) | 32.81 (52.72) | 135.48* (38.16) |
| Avg. Monthly Salary 2018 | 189.86*** (46.12) | 164.95*** (46.99) | 140.56*** (49.53) | 167.37*** (45.92) | 34.86 (50.11) | 30.44 (62.93) | 150.42* (46.55) |
| Avg. Monthly Salary 2019 | 194.74*** (47.82) | 187.21*** (49.36) | 158.49*** (51.36) | 190.57*** (48.11) | 56.73 (52.74) | 67.53 (67.21) | 162.66* (48.12) |
| Probabilities | |||||||
| Permanent contract | 0.078*** (0.242) | 0.050** (0.227) | 0.053** (0.239) | 0.056** (0.223) | 0.080*** (0.225) | 0.087*** (0.295) | 0.069** (0.235) |
| Same employer | −0.086*** (0.167) | −0.125*** (0.167) | −0.126*** (0.174) | −0.121*** (0.164) | −0.130*** (0.177) | −0.147*** (0.242) | −0.092** (0.166) |
| Variable | Optimal | Nearest neighbor with caliper | Nearest neighbor without replacement | Nearest neighbor with replacement | Exact | Coercion | Genetic |
|---|---|---|---|---|---|---|---|
| Matched observations | 489 | 467 | 489 | 489 | 360 | 243 | 489 |
| Covariate balance | Balanced | Balanced | Balanced | Balanced | Balanced | Balanced | Balanced |
| Average contract duration | 106.72 | 101.70 | 99.67 | 108.75 | 50.12 (22.51) | 39.77 (29.03) | 65.24 |
| Avg. Monthly Salary 2017 | 174.67 | 141.60 | 146.65 | 151.32 | 22.82 (42.94) | 32.81 (52.72) | 135.48 |
| Avg. Monthly Salary 2018 | 189.86 | 164.95 | 140.56 | 167.37 | 34.86 (50.11) | 30.44 (62.93) | 150.42 |
| Avg. Monthly Salary 2019 | 194.74 | 187.21 | 158.49 | 190.57 | 56.73 (52.74) | 67.53 (67.21) | 162.66 |
| Permanent contract | 0.078 | 0.050 | 0.053 | 0.056 | 0.080 | 0.087 | 0.069 |
| Same employer | −0.086 | −0.125 | −0.126 | −0.121 | −0.130 | −0.147 | −0.092 |
1. ATT estimates reflect average treatment effects on the treated for each outcome
2. Marginal effects are reported for the binary outcome variables
3. Standard errors are shown in parentheses
4. Statistical significance levels: ***p < 0.01, **p < 0.05, *p < 0.10
5. The caliper value chosen for Nearest Neighbor is 0.01
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