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Table 1 - Summary of Data Analysis Adopted for the 1990 and 1995 NPTS
Excel |
CSV
| Sample size-total trips |
159,832 |
381,388 |
| Reasons for dropping records |
|
|
| Invalid destination |
3,314 |
43 |
| Trip in miles >200 |
23,372 |
27,455 |
| Travel minutes >120 |
3,015 |
5,254 |
| Age >65 years |
9,210 |
35,399 |
| Age <18 years |
21,470 |
63,832 |
| Shop duration >420 |
707 |
70 |
| Total dropped |
61,088 |
132,053 |
| Subtotal at trip level (after records are dropped) |
98,744 |
249,335 |
| Subtotal at person level |
15,870 |
52,341 |
| Travel + duration minutes >1,440 |
7,652 |
656 |
| Travel + duration minutes <1,440 |
2,643 |
17,119 |
| Duration <0 |
654 |
2,237 |
| Total dropped |
10,949 |
20,012 |
| Net total at person level |
4,921 |
32,329 |
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