Table 3. Testing for Random Assignment of TAA Petitions to Investigators
Baseline TAA Approved Investigator Leniency F-Test [p-value]
(1) (2) (3) (4) (5) (6)
A. Pre-Determined Demographics (LEHD)
Age (time of filing) 40.771 0.0007* (0.0004) -0.00007 (0.0001) -0.00002 (0.00004) -0.00002 (0.00004) [0.4437]
Female 0.5248 0.0281** (0.0118) 0.0015 (0.0019) -0.0005 (0.0009) -0.0006 (0.0009) [0.5166]
Black 0.1147 -0.0415* (0.0229) -0.0081** (0.0033) -0.0035 (0.0026) -0.0034 (0.0025) [0.3025]
White 0.7957 -0.0192 (0.0151) -0.0018 (0.0025) -0.0001 -0.0020 -0.0001 (0.0020) [0.2819]
High School Degree 0.3865 -0.0057 (0.0069) -0.0020 (0.0015) -0.0011 (0.0012) -0.0010 (0.0011) [0.8490]
Some College 0.2936 -0.0110 (0.0068) -0.00189 (0.0015) -0.0007 (0.0011) -0.0006 (0.0010) [0.3707]
College Degree 0.1173 -0.0224** (0.0089) -0.0014 (0.0021) -0.0013 (0.0011) -0.0012 (0.0011) [0.3110]
B. Pre-Determined Economic Variables (LEHD)
Annual Earnings ($1,000) 26.880 -0.0021*** (0.0006) -0.0002 (0.0001) -0.0001 (0.00007) -0.00007 (0.00007) [0.0917]
Quarters Employed 3.5566 -0.0060 (0.0048) 0.0011 (0.0012) 0.0007 (0.0008) 0.0006 (0.0008) [0.0627]
Quarters Employed (full-time equivalence) 3.2330 0.0154*** (0.0041) 0.0011 (0.0009) 0.0002 (0.0004) 0.0002 (0.0005) [0.0586]
Employed 0.9236 0.0420** (0.0189) -0.0040 (0.0027) -0.0025 (0.0025) -0.0021 (0.0025) [0.2100]
# of Jobs / Year 1.1120 -0.0007 (0.0008) 0.0002 (0.0002) 0.0002* (0.0001) 0.0002** (0.0001) [0.2325]
Tenure (years at separation) 5.0390 0.0012*** (0.0004) 0.0002** (0.0001) 0.0001** (0.0001) 0.0001** (0.0006) [0.0291]
Init. Employer Mean Earnings ($1,000) 23.159 0.0008 (0.0024) 0.0006 (0.0004) 0.0005 (0.0004) 0.0005 (0.0004) [0.1070]
County Unemployment Rate (time of filing) 6.6054 0.0070 (0.0059) -0.0001 (0.0012) 0.0005 (0.0009) 0.0008 (0.0009) [0.0952]
Prob(Employed at Petitioner Firm) 0.7409 -0.0114 (0.0171) 0.0005 (0.0022) -0.0012 (0.0019) -0.0012 (0.0019) [0.0423]
Prob(Employed at Petitioner 2-Digit NAICS) 0.7760 0.0177 (0.0211) -0.0004 (0.0029) -0.0007 (0.002) -0.0008 (0.0020) [0.7783]
Prob(Employed in Petitioner Commuting Zone) 0.6853 -0.0245 (0.0253) 0.0026 (0.0046) 0.0067** (0.0031) 0.0066** (0.0031) [0.4896]
C. Pre-Determined Petitioner Characteristics (DOL)
Company Filer 0.3267 0.2190*** (0.0436) 0.0024 (0.0072) 0.0012 (0.0079) 0.0016 (0.0079) [0.5251]
Union Filer 0.1415 -0.0068 (0.0491) -0.0043 (0.0086) -0.0038 (0.0085) -0.0038 (0.0086) [0.8211]
Worker-Group Filer 0.4354 -0.0643 (0.0469) 0.0001 (0.0070) -0.0024 (0.0075) -0.00152 (0.0074) [0.8612]
Investigator Caseload (no. of petitions) 23.2509 0.00001 (0.0009) -0.0003* (0.0002) -0.00008 (0.0002) -0.00005 (0.0002) [0.3175]
Investigator Tenure (decades) 0.9419 0.00002 (0.00003) -0.00004** (0.00002) -0.00004** (0.00002) -0.00004** (0.00002) [0.0177]
Prob(Tradable) (Mian & Sufi, 2011) 0.6008 0.0687** (0.0270) 0.0009 (0.0048) – – – – [0.0952]
Offshorability Z-Score (Blinder, 2007) 0.3076 0.0032 (0.0176) -0.0058** (0.0025) – – – – [0.0967]
Offshorability Z-Score (Autor & Dorn, 2013) 0.2533 -0.0121 (0.0103) -0.0021 (0.0018) – – – – [0.1812]
Filer Industry FEs (4-digit SIC) – yes yes yes
Investigator Concentration Controls – yes yes
Joint F-Test [p-value] – [0.0000] [0.0409] [0.2033] [0.1801] [0.1801]
Number of Petitioners – ∼4,300 ∼4,300 ∼4,300 ∼4,300 ∼4,300
Number of Employers – ∼86,000 ∼86,000 ∼86,000 ∼86,000 ∼86,000
Number of Displaced Workers – ∼177,000 ∼177,000 ∼177,000 ∼177,000 ∼177,000
Number of Observations – ∼1,381,000 ∼1,381,000 ∼1,381,000 ∼1,381,000 ∼1,381,000
NOTES—This table tests for random assignment of TAA petitions to DOL investigators. Observations are pooled from eligible separating workers in the
“High Attachment” sample 40 to 5 quarters before their petition decision, and restricted to first-time filers. The sample includes working-age individuals
(22-65) making under $50,000 annually in the pre-period, with 2 years above the annual minimum wage equivalent prior to filing ($7.25 * 2,082 average
working hours in 2010 ≈ $15,000). Column (1) reports the baseline mean. The dependent variable in column (2) is an indicator for TAA approval.
The dependent variable in columns (3) to (5) is the investigator leniency IV. Column (6) shows p-values from separate regressions of the leniency IV on
each covariate. Monetary variables are deflated to 2010 US dollars, seasonally adjusted, and winsorized at 1% to limit outlier influence. All regressions
contain quarter-of-filing and calendar-year fixed effects. Standard errors are clustered at the investigator level. ***p<0.01, **p<0.05, *p<0.10. Source:
LEHD,USDOL
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