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The results reported in table 3 correspond to the regression of mean line-daily worker attendance on the identical specifications to those in table 2, as described in section IVB. The estimates from table 3 suggest a negative impact of temperature on attendance at temperatures below 19C, however, the magnitudes of the point estimates are extremely small (less than 1% of the mean). All other estimates of coefficients, including those reflecting the impacts of LED, are statistically indistinguishable from 0. In general, we interpret the results in table 3 as indicating no real impacts of temperature on worker attendance. These results imply that it is unlikely that the impact of temperature on worker attendance contributes to the estimated impacts of temperature and LED installation on efficiency.

Table 3.
Impact of Temperature on Attendance and Mitigative Impact of LED Lighting
 
 Worker Presence (Line-Level Mean Daily Probability) 
Wet bulb globe temperature <19 -0.0061** -0.0059** −0.0011 −0.0007 
 [-0.0166,-0.000630] [-0.0167,-0.000305] [−0.00534, 0.00162] [−0.00506, 0.00204] 
Wet bulb globe temperature 19 0.0003 0.0007 0.0056 0.0064 
 [−0.00585, 0.00973] [−0.00533, 0.00989] [−0.00409, 0.0186] [−0.00341, 0.0193] 
1(LED) × (Wet bulb globe temperature <19)   0.0003 0.0002 
   [−0.00283, 0.00442] [−0.00298, 0.00428] 
1(LED) × (Wet bulb globe temperature 19)   −0.0051 −0.0053 
   [−0.0197, 0.00771] [−0.0199, 0.00743] 
1(LED)   −0.0065 −0.0054 
   [−0.0708, 0.0427] [−0.0701, 0.0441] 
 Factory × Year, Factory × Calendar Month 
Fixed effects Production Line, Day of the Week 
Precipitation control 
Observations 136,062 136,062 392,601 392,601 
Mean of dependent variable 0.846 0.846 0.829 0.829 
 
 Worker Presence (Line-Level Mean Daily Probability) 
Wet bulb globe temperature <19 -0.0061** -0.0059** −0.0011 −0.0007 
 [-0.0166,-0.000630] [-0.0167,-0.000305] [−0.00534, 0.00162] [−0.00506, 0.00204] 
Wet bulb globe temperature 19 0.0003 0.0007 0.0056 0.0064 
 [−0.00585, 0.00973] [−0.00533, 0.00989] [−0.00409, 0.0186] [−0.00341, 0.0193] 
1(LED) × (Wet bulb globe temperature <19)   0.0003 0.0002 
   [−0.00283, 0.00442] [−0.00298, 0.00428] 
1(LED) × (Wet bulb globe temperature 19)   −0.0051 −0.0053 
   [−0.0197, 0.00771] [−0.0199, 0.00743] 
1(LED)   −0.0065 −0.0054 
   [−0.0708, 0.0427] [−0.0701, 0.0441] 
 Factory × Year, Factory × Calendar Month 
Fixed effects Production Line, Day of the Week 
Precipitation control 
Observations 136,062 136,062 392,601 392,601 
Mean of dependent variable 0.846 0.846 0.829 0.829 

Wild-cluster bootstrap 95% CIs in brackets: significant at ***1%, **5%, and *10%. Clustering is done at the factory level. All measures of temperature are in degrees Celsius.

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