Figure 7: Shewhart Chart of Standardized Resuduals of Late Arrivals Series: September 1987-February 2002

Figure 7: Shewhart Chart of Standardized Resuduals of Late Arrivals Series: September 1987-February 2002

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Date Standardized Residuals
Sep-87 0
Oct-87 -0.831215936
Nov-87 0.272067145
Dec-87 1.072273486
Jan-88 -0.07990944
Feb-88 -0.947939024
Mar-88 -1.429477318
Apr-88 -0.798210644
May-88 -0.166101448
Jun-88 -2.110623986
Jul-88 0.125937293
Aug-88 -0.373314072
Sep-88 -0.011360715
Oct-88 0.663783614
Nov-88 1.495720543
Dec-88 -0.614599306
Jan-89 -0.335899657
Feb-89 1.744208927
Mar-89 2.098220171
Apr-89 -1.775580796
May-89 0.238955305
Jun-89 0.959140676
Jul-89 -0.382831164
Aug-89 0.417592118
Sep-89 -0.250611513
Oct-89 -0.075835935
Nov-89 -0.176773728
Dec-89 0.304764804
Jan-90 -1.837681415
Feb-90 0.947109556
Mar-90 -0.140811486
Apr-90 -0.639779391
May-90 0.117521916
Jun-90 -1.015756415
Jul-90 -0.392705993
Aug-90 0.493804519
Sep-90 -0.47079481
Oct-90 0.34201431
Nov-90 -0.997966208
Dec-90 1.739368508
Jan-91 0.094565905
Feb-91 -1.617537561
Mar-91 -0.048087039
Apr-91 0.086117578
May-91 0.081096693
Jun-91 -1.786555205
Jul-91 -0.297441213
Aug-91 0.166208798
Sep-91 -0.287826757
Oct-91 1.181630297
Nov-91 0.297459799
Dec-91 -0.917473026
Jan-92 -0.764886044
Feb-92 -0.340027316
Mar-92 0.860610435
Apr-92 -0.092155039
May-92 0.031773895
Jun-92 0.325743777
Jul-92 1.01290176
Aug-92 0.369517418
Sep-92 -0.239505795
Oct-92 -0.297214114
Nov-92 0.197826941
Dec-92 0.794668403
Jan-93 -0.488450143
Feb-93 0.636685685
Mar-93 1.613788968
Apr-93 -0.735076824
May-93 -1.566295664
Jun-93 -1.045524186
Jul-93 -0.941921991
Aug-93 0.017654072
Sep-93 0.839556326
Oct-93 0.950532616
Nov-93 0.517313435
Dec-93 -0.852441191
Jan-94 2.080592043
Feb-94 0.848371842
Mar-94 -1.7820062
Apr-94 -0.023288126
May-94 -1.292664412
Jun-94 -0.307931551
Jul-94 0.971311916
Aug-94 -0.750456377
Sep-94 -0.668197407
Oct-94 0.241358912
Nov-94 1.095138552
Dec-94 -0.844308053
Jan-95 1.28732649
Feb-95 -0.095198808
Mar-95 0.141656813
Apr-95 0.591296032
May-95 0.581994004
Jun-95 0.401911743
Jul-95 -0.528294824
Aug-95 -0.254419536
Sep-95 -0.842545454
Oct-95 0.57486664
Nov-95 1.006482628
Dec-95 1.655250004
Jan-96 0.038834946
Feb-96 0.502141739
Mar-96 -0.596103201
Apr-96 -0.474145065
May-96 0.177737927
Jun-96 0.035369403
Jul-96 0.30140362
Aug-96 0.313881687
Sep-96 -0.020205418
Oct-96 0.448515569
Nov-96 -0.521625859
Dec-96 1.12972874
Jan-97 0.26934457
Feb-97 -1.166138235
Mar-97 -1.183998528
Apr-97 -0.068462155
May-97 -0.938856491
Jun-97 0.229025759
Jul-97 0.190472289
Aug-97 -0.235271235
Sep-97 -1.047920015
Oct-97 0.458513659
Nov-97 0.67287529
Dec-97 -0.143757729
Jan-98 -0.359679212
Feb-98 0.381860095
Mar-98 0.385568156
Apr-98 0.355696276
May-98 0.748458604
Jun-98 1.177578586
Jul-98 -1.35950091
Aug-98 -0.246790545
Sep-98 0.283864028
Oct-98 -0.64813279
Nov-98 -1.367722611
Dec-98 0.302611586
Jan-99 1.961130092
Feb-99 -1.527821631
Mar-99 -0.299789344
Apr-99 1.626956294
May-99 0.839020829
Jun-99 0.712490843
Jul-99 0.801825133
Aug-99 -1.062617433
Sep-99 -0.558856394
Oct-99 -0.500775123
Nov-99 -1.231690519
Dec-99 -1.572221154
Jan-00 0.539258478
Feb-00 0.682819567
Mar-00 0.033789397
Apr-00 1.594334282
May-00 1.281917702
Jun-00 1.722646515
Jul-00 0.254907945
Aug-00 0.213645462
Sep-00 -1.287401738
Oct-00 -0.102716659
Nov-00 0.398235271
Dec-00 -0.822634262
Jan-01 -1.904899224
Feb-01 0.377859988
Mar-01 -0.210100467
Apr-01 -0.203730917
May-01 -0.690453283
Jun-01 0.14663998
Jul-01 -0.31189092
Aug-01 0.374737939
Sep-01 3.708235451
Oct-01 -3.006997466
Nov-01 -2.190402644
Dec-01 -1.790690012
Jan-02 -1.063320917
Feb-02 -0.985529644

Note: The upper and lower grid lines are two standard deviations away from the mean.