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Table 7 OLS Regression for PO frequency on Newcastle University staff
From: Exploring the relationship between urban freight demand and the purchasing behaviour of a University
Variable Factors | Std. coefficient (β) | t-test | Sig. (p-value) | Collinearity statistics | |
|---|---|---|---|---|---|
| Â | Â | Â | Â | 1/VIF | VIF |
(Constant) | Â | 8.801 | .000 | Â | Â |
Administrative and professional (e.g. Library, Clerical, Administrative, Managerial) | .210 | 4.038 | .000 | .494 | 2.024 |
Specialist, Technical and Professional (e.g. Technician) | .245 | 5.637 | .000 | .704 | 1.421 |
Operational Services (e.g. Ancillary, Cleaning and Catering, Porters, Farm Workers, Ground Staff, Maintenance, Security) | .158 | 4.114 | .000 | .909 | 1.100 |
Purchases made using a University purchasing card | .224 | 5.590 | .000 | .830 | 1.204 |
PO made collectively once or twice a week | .124 | 3.215 | .001 | .902 | 1.109 |
PO made with irregular repeating pattern | −.235 | −5.723 | .000 | .795 | 1.259 |
Type of goods: chemicals (hazardous or otherwise) | .285 | 5.543 | .000 | .504 | 1.986 |
Type of goods: bulk gasses, oils, fuels, etc. | −.092 | −1.905 | .058 | .575 | 1.740 |
Type of goods: furniture | .070 | 1.662 | .097 | .752 | 1.330 |
‘Next day’ expected delivery | .075 | 1.856 | .064 | .818 | 1.222 |
‘As soon as possible’ expected delivery | .102 | 2.538 | .012 | .832 | 1.201 |
Location: King’s Gate (Main Central Administration office of the University) | −.145 | −3.395 | .001 | .735 | 1.360 |
Female | .068 | 1.707 | .089 | .847 | 1.180 |
Private purchased delivered to workplace | −.022 | −.565 | .572 | .909 | 1.100 |
Composite attitudes towards private purchasing behaviour | −.024 | −.620 | .536 | .892 | 1.121 |