Income Differences between Flexibly and Nonflexibly Employed Persons and Their Deconstruction: An Analysis Based on Data from the 2018 China Mobility Monitor

Table 8

Differences in earnings between flexible and nonflexible workers under different matching methods and parameters.

Matching method	Sample		Parameter	ATT	t-value
	Control group	Experimental group
Nearest neighbour matching method	69052	55526	k = 1	0.1322	30.83
	69052	55526	k = 2	0.1311	30.47
	69052	55526	k = 4	0.1299	30.16
	69052	55526	k = 7	0.1294	29.99
	69052	55526	k = 12	0.1296	29.99
Caliper matching method: Nearest-neighbour matching of different caliper widths	68713	55373	& = 0.001, K = 1	0.2364	3.08
	68713	55373	& = 0.01, K = 1	0.2364	3.08
	68713	55373	& = 0.1, K = 1	0.2364	3.08
	68713	55373	& = 0.001, K = 2	0.1450	2.71
	68713	55373	& = 0.01, K = 2	0.1450	2.71
	68713	55373	& = 0.1, K = 2	0.1450	2.71
	68713	55373	& = 0.001, K = 7	0.1361	4.85
	68713	55373	& = 0.01, K = 7	0.1288	4.72
	69052	55373	& = 0.1, K = 7	0.1361	4.85
	69052	55373	& = 0.001, K = 12	0.1192	5.56
	68713	55373	& = 0.01, K = 12	0.1204	5.58
	68713	55373	& = 0.1, K = 12	0.1204	5.58
Radius (caliper) matching method	69052	55488	& = 0.001	0.1289	30.32
	69052	55527	& = 0.005	0.1341	31.67
	69052	55528	& = 0.01	0.1296	30.74
	69052	55528	& = 0.1	0.1229	30.10
Kernel matching method	69052	55528	k (epan). bw (0.06)	0.1301	31.17
	69052	55528	k (epan). bw (0.03)	0.1311	31.11
	69052	55528	k (epan). bw (0.01)	0.1270	30.11
	69052	55528	k (normal). bw (0.06)	0.1210	29.64
	69052	55528	k (normal). bw (0.03)	0.1269	30.57
	69052	55528	k (normal). bw (0.01)	0.1286	30.48
Local linear regression matching method	69052	55528	k (epan). bw (0.06)	0.1334	1.77
	69052	55528	k (epan). bw (0.03)	0.1334	1.77
	69052	55528	k (epan). bw (0.01)	0.1327	1.76
	69052	55528	k (normal). bw (0.06)	0.1301	30.69
	69052	55528	k (normal). bw (0.03)	0.1315	31.15
	69052	55528	k (normal). bw (0.01)	0.1307	30.99
Martens matching	69052	55528	m = k = 1	0.1834	3.69
	69052	55528	m = k = 2	0.1503	3.62
	69052	55528	m = k = 5	0.1906	7.29
	69052	55528	m = k = 7	0.1345	6.90