Figure 7 Shewhart Chart of Standardized Resuduals of Late Arrivals Series: September 1987–February 2002,,,,,,,,,
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.,

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