Bureau of Transportation Statistics (BTS)
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Figure 2 Graphical Representation of (a)an Eigenflow and its (b)Corresponding Principal Axis

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(a)

Eigenflow 3 Days, February 2000
1 0.0419
2 0.0127
3 0.0343
4 0.0782
5 0.0555
6 0.0535
7 0.0239
8 0.0063
9 0.0005
10 0.0115
11 −0.0113
12 −0.0173
13 −0.0128
14 −0.0125
15 −0.0155
16 −0.019
17 0.0505
18 0.0233
19 0.0103
20 0.0308
21 0.0374
22 0.0597
23 0.0724
24 0.0723
25 −0.0634
26 −0.0568
27 −0.0763
28 −0.0036
29 0.0392
30 0.0513
31 0.0365
32 0.0116
33 −0.0237
34 −0.0586
35 −0.0646
36 −0.0655
37 −0.0694
38 −0.0517
39 −0.05
40 −0.048
41 −0.0571
42 −0.0546
43 0.0092
44 −0.0009
45 0.021
46 −0.0005
47 −0.0066
48 −0.0195
49 −0.0033
50 −0.0066
51 0.012
52 0.0349
53 0.045
54 0.0309
55 0.0377
56 0.0389
57 −0.0062
58 −0.0067
59 −0.0374
60 −0.0667
61 −0.0983
62 −0.0977
63 −0.054
64 −0.0379
65 −0.0343
66 −0.0356
67 −0.0424
68 −0.0429
69 −0.0425
70 −0.0426
71 −0.0369
72 −0.0361
73 −0.0037
74 0.0174
75 0.0201
76 0.0229
77 0.0162
78 0.0098
79 0.0103
80 0.0092
81 −0.0789
82 −0.0719
83 −0.0695
84 −0.0717
85 −0.0704
86 −0.0721
87 −0.0713
88 −0.0716
89 −0.0864
90 −0.068
91 −0.0786
92 −0.0819
93 −0.0677
94 −0.0546
95 0.0044
96 −0.031
97 −0.0515
98 −0.0571
99 −0.066
100 −0.0671
101 −0.0689
102 −0.0526
103 −0.0635
104 −0.068
105 −0.0695
106 −0.0678
107 −0.0725
108 −0.0725
109 −0.09
110 −0.0857
111 −0.0948
112 −0.0098
113 −0.0645
114 −0.068
115 −0.0709
116 −0.0705
117 −0.0618
118 −0.0633
119 −0.0763
120 −0.0907
121 −0.1269
122 −0.1263
123 −0.1268
124 −0.1195
125 −0.1078
126 −0.1269
127 −0.1008
128 −0.0846
129 −0.0171
130 −0.0105
131 0.0042
132 0.0042
133 0.0058
134 0.0201
135 0.0394
136 0.0201
137 0.0128
138 0.0108
139 0.0187
140 −0.0017
141 −0.0219
142 −0.0367
143 −0.0356
144 −0.0518
145 0.0452
146 0.0538
147 0.0572
148 −0.0018
149 −0.0018
150 0.0263
151 0.0371
152 0.0404
153 0.0467
154 0.0434
155 0.014
156 0.0057
157 0.0014
158 0.0092
159 0.0111
160 0.0054
161 0.0685
162 0.0508
163 0.0417
164 0.0329
165 0.0389
166 0.0571
167 0.0468
168 0.0335
169 0.0111
170 0.0237
171 0.0148
172 0.0175
173 0.0028
174 −0.0232
175 −0.0098
176 −0.0035
177 0.05
178 0.059
179 0.04
180 −0.0043
181 −0.017
182 −0.025
183 −0.0319
184 −0.0287
185 0.0112
186 0.0541
187 0.0652
188 0.0881
189 0.0586
190 0.038
191 0.031
192 0.0251
193 −0.0791
194 −0.0738
195 −0.0712
196 −0.0737
197 −0.0719
198 −0.0707
199 −0.0693
200 −0.0729
201 −0.0716
202 −0.0694
203 −0.0694
204 −0.0876
205 −0.0681
206 −0.0619
207 −0.0591
208 −0.0584
209 −0.0578
210 −0.0604
211 −0.0553
212 0.0378
213 0.0448
214 0.034
215 0.0412
216 0.0357
217 0.0236
218 0.0115
219 0.0073
220 −0.0113
221 0.0236
222 0.0115
223 0.0073
224 −0.0113
225 0.0337
226 0.0085
227 0.0205
228 0.026
229 0.0475
230 0.0714
231 0.0621
232 0.0598
233 0.0153
234 0.0239
235 0.0149
236 −0.0221
237 −0.0261
238 −0.0096
239 −0.0096
240 −0.0128
241 0.0226
242 −0.0015
243 0.0094
244 0.026
245 0.0166
246 0.0593
247 0.052
248 0.0225
249 0.0066
250 0.0375
251 0.0433
252 0.0252
253 0.0236
254 0.0193
255 0.0262
256 0.0081
257 0.0331
258 0.0866
259 0.0284
260 0.0504
261 0.0775
262 0.0952
263 0.073
264 0.0807
265 0.0798
266 0.0581
267 0.0298
268 0.0228
269 0.0337
270 0.0046
271 0.0116
272 0.0082
273 −0.014
274 −0.0037
275 0.0095
276 0.0146
277 0.0385
278 0.0543
279 0.0668
280 0.0189
281 −0.0234
282 0.0157
283 0.0253
284 −0.0025
285 −0.0061
286 −0.0093
287 −0.0205
288 0.0064
289 −0.0354
290 −0.0369
291 −0.0462
292 −0.0493
293 −0.011
294 −0.0321
295 −0.0306
296 0.0111
297 0.063
298 0.0499
299 0.0961
300 0.0459
301 0.075
302 0.071
303 0.0727
304 0.0756
305 −0.0212
306 −0.0284
307 −0.0251
308 −0.0225
309 −0.0257
310 −0.0242
311 −0.0243
312 −0.0316
313 −0.0292
314 −0.0253
315 −0.0428
316 −0.0271
317 −0.0052
318 0.0138
319 0.017
320 0.0103
321 −0.0576
322 −0.0618
323 −0.0612
324 −0.0671
325 −0.0614
326 −0.0598
327 −0.0677
328 −0.0829
329 −0.0986
330 −0.1023
331 −0.1039
332 −0.097
333 −0.0967
334 −0.1012
335 −0.1053
336 −0.1059
337 −0.0224
338 −0.0059
339 0.0058
340 0.0217
341 0.0276
342 0.0382
343 0.0345
344 0.0558
345 0.0549
346 0.0509
347 0.045
348 0.0272
349 0.013
350 −0.0077
351 −0.0106
352 0.0002
353 −0.0176
354 −0.0137
355 0.0023
356 0.0247
357 0.024
358 −0.0089
359 −0.0287
360 0.0091
361 −0.0086
362 −0.0182
363 0.0105
364 0.0002
365 −0.0087
366 −0.0152
367 −0.026
368 −0.0246
369 −0.009
370 −0.0054
371 0.0071
372 0.0252
373 0.0259
374 0.0391
375 0.0228
376 0.0089
377 0.003
378 0.0036
379 −0.0003
380 −0.0045
381 −0.0175
382 −0.025
383 −0.0249
384 −0.0266
385 −0.0087
386 0.0073
387 0.0359
388 0.0366
389 0.048
390 0.0841
391 0.0797
392 0.0782
393 0.0577
394 0.0334
395 0.0123
396 0.0081
397 0.0136
398 0.007
399 0.014
400 0.0178
401 0.053
402 0.0372
403 0.0399
404 0.0458
405 0.0408
406 −0.0262
407 −0.0252
408 −0.0129
409 −0.0052
410 0.0247
411 0.044
412 0.031
413 0.0446
414 0.0354
415 0.0418
416 0.0384
417 0.0349
418 0.0552
419 0.0538
420 0.0503
421 0.0458
422 0.0565
423 0.0537
424 0.0097
425 0.01
426 0.011
427 0.0106
428 −0.0125
429 0.0224
430 0.006
431 0.0137
432 0.0325
433 −0.0542
434 −0.0032
435 0.013
436 0.0296
437 0.0322
438 0.0444
439 0.0539
440 0.0569
441 0.0282
442 0.0155
443 −0.003
444 0.0025
445 −0.014
446 −0.02
447 −0.0146
448 −0.0197

(b)

Principal axis Measurement point (loop number)
0 0
1 −0.1098
2 −0.0063
3 −0.0708
4 0.0154
5 −0.0366
6 −0.018
7 −0.0326
8 0.0924
9 0.0793
10 −0.043
11 −0.0611
12 0.1614
13 0.0436
14 −0.0455
15 −0.1712
16 0.0582
17 −0.0045
18 0.1782
19 −0.0798
20 0.3123
21 0.0101
22 0.1753
23 −0.3118
24 −0.0701
25 0.2176
26 0.0486
27 −0.1462
28 −0.0657
29 0.0438
30 −0.1951
31 −0.0087
32 0.0747
33 0.1514
34 0.0504
35 −0.1817
36 −0.0241
37 0.1651
38 0.341
39 0.165
40 0.0373
41 −0.1419
42 −0.1096
43 0.0483
44 0.0883
45 0.0544
46 0.0742
47 0.0532
48 −0.0045
49 −0.021
50 0.101
51 −0.0035
52 0.0461
53 0.0307
54 −0.0079
55 −0.035
56 −0.1372
57 0.0668
58 0.0978
59 −0.0081
60 0.0577
61 −0.008
62 −0.0987
63 −0.0264
64 −0.0246
65 −0.0505
66 −0.096
67 0.1838
68 0.04
69 −0.0151
70 −0.0065
71 −0.1668
72 0.0176
73 0.0047
74 −0.0098
75 0.0238
76 −0.1165
77 0.0214
78 0.0687
79 −0.0024
80 0.1078
81 0.1135
82 0.0395
83 −0.0097
84 0.0288
85 0.0417
86 0.0176
87 −0.0492
88 −0.0314
89 0.0762
90 0.0072
91 0.0228
92 −0.0093
93 0.0868
94 −0.0381
95 −0.0138
96 0.0245
97 −0.0268
98 −0.0075
99 0.0661
100 0.0035
101 −0.0087
102 −0.0597
103 0.0022
104 −0.0434
105 −0.0203
106 0.0371
107 −0.0134
108 0.0134
109 −0.0092
110 −0.0361
111 −0.0111
112 −0.0053
113 −0.0122
114 −0.0221
115 −0.0166
116 −0.0147
117 0.0021
118 −0.0154
119 −0.0187
120 −0.0009
121 0.0068
122 0.0104
123 0.0009
124 −0.0008
125 0
126 0
127 0
128 0
129 0
130 0
131 0
132 0
133 0
134 0
135 0
136 0
137 0
138 0
139 0
140 0