Strategies for construction hazard recognition
SAMPLE CALCULATION USING SMQM CASE DATA (Crew 1: Structural Crew)
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| SAMPLE CALCULATION USING SMQM CASE DATA (Crew 1: Structural Crew) Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Crew 1 26.56 32.81 35.00 31.82 38.10 36.99 65.63 68.75 66.13 67.22 68.33 73.33 69.04 72.79 71.39 73.12 Crew 2 39.47 38.46 43.90 33.33 39.02 37.21 39.53 39.53 72.23 72.56 67.93 70.22 66.92 68.58 69.36 71.89 Crew 3 40.00 42.00 35.85 39.62 38.00 36.54 38.46 38.89 37.25 39.62 74.33 76.07 77.31 78.42 76.42 77.80 : 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Ha za rd re co gn iti on le ve l ( %) Work Period (Time) --> 179 Model Comparison for Crew Crew 1 Model I Output Model II Output Reg eqn 27.063+1.853T+26.006D-1.067SC Reg eqn D Predictor Coef Std. Error t p Predictor Coef Std. Error t p Constant 27.063 1.935 13.987 0 Constant 33.547 1.392 24.095 0 Time 1.853 0.497 3.729 0.003 DD SC -1.067 0.547 -1.95 0.075 Std. Error of est. 2.07833 Std. Error of est. 3.41039 R-sq 99.00% R-sq 96.80% R-sq (adj) 98.70% R-sq (adj) 96.50% SS Reg 4978.11 SS Reg 4867.11 MS Res 4.32 Durbin-Watson 2.874 Durbin-Watson 1.416 d L 0.857 The errors of the model are independent. d L 1.106 The errors of the model are independent. d U 1.728 d U 1.371 HM test -1.0655 HM test 1.0103 p-value 0.2866 p-value 0.315 Cutting Cranes div 180 Model Comparision test ((Ss Reg Model I- SSRegModel II)/2)/MS Reg Model I (F obt. ) 2.8068 F critical Thus Model I is appropriate. The level change coefficient 26.006 The change is statistically significant p < 0.05 95% confidence interval on level change 21.021 30.992 Standardized level change 12.51359 Confidence and Prediction Interval 182 Download 2.75 Mb. Share with your friends:
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