| (1) | (2) | (3) | (4) | (5) | (6) | ||||||||
| A/national core sample | B/Shanghai | C/Floating population area | |||||||||||
Mathematical achievement | a1/Native | a2/Outsiders | b1/Native | b2/Outsiders | c1/Native | c2/Outsiders | ||||||||
Communication frequency | −0.593** | 0.421 | 1.122 | 1.453 | 0.217 | −0.552 | ||||||||
| (0.203) | (0.552) | (0.708) | (1.090) | (0.263) | (0.447) | ||||||||
Relationship evaluation | 1.390*** | 0.119 | 0.306 | 0.449 | 1.329*** | 1.544*** | ||||||||
| (0.173) | (0.545) | (0.568) | (1.022) | (0.230) | (0.417) | ||||||||
Sample size | 3933 | 382 | 367 | 117 | 1884 | 550 | ||||||||
1) Students who only include groups of rural households | ||||||||||||||
Communication frequency | −0.769** | 1.353 | 2.142 | 1.907 | 0.00817 | −0.204 | ||||||||
| (0.260) | (0.753) | (3.157) | (2.208) | (0.515) | (0.627) | ||||||||
Relationship evaluation | 1.352*** | 0.296 | 1.779 | 4.262 | 1.456*** | 1.454** | ||||||||
| (0.217) | (0.675) | (2.497) | (2.725) | (0.429) | (0.557) | ||||||||
Sample size |
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Communication frequency | 2598 | 217 | 28 | 37 | 548 | 340 | ||||||||
2) Add control variables parent-child relationship variables (contact frequency and relationship | ||||||||||||||
Communication frequency | −0.692** | 0.319 | 1.366 | −0.0323 | 0.328 | −0.435 | ||||||||
| (0.225) | (0.626) | (0.758) | (1.249) | (0.286) | (0.511) | ||||||||
Relationship evaluation | 1.256*** | −0.345 | 0.417 | 0.148 | 1.117*** | 1.584*** | ||||||||
| (0.190) | (0.611) | (0.610) | (1.056) | (0.254) | (0.459) | ||||||||
Sample size | 3488 | 333 | 351 | 110 | 1746 | 491 | ||||||||