Why are There Zero Weights in the 1990 Census?

Size of the Migration/Place of Work Sample According to SMSA(H10)
 
State         Population     [Mig Sample*2]    %P         %Mig

    0           2226930           2230138      .1963     .1963
   40              5571              5540      .0005     .0005
   80             33189             33128      .0029     .0029
  120              5593              5632      .0005     .0005
  160             37037             37046      .0033     .0033
  200             22839             22888      .0020     .0020
  220              6794              6792      .0006     .0006
  240             25065             24946      .0022     .0022
  280              6731              6850      .0006     .0006
  320              8628              8662      .0008     .0008
  360             96935             97242      .0085     .0086
  380              8780              8768      .0008     .0008
  400              7001              6924      .0006     .0006
  405              6671              6584      .0006     .0006
  440             13347             13390      .0012     .0012
  450              6020              6010      .0005     .0005
  460             14583             14688      .0013     .0013
  500              6466              6456      .0006     .0006
  520             89062             89286      .0079     .0079
  560              9702              9718      .0009     .0009
  600             14496             14482      .0013     .0013
  640             26878             26770      .0024     .0024
  680             20116             20152      .0018     .0018
  720            108599            108540      .0096     .0096
  760             23832             24142      .0021     .0021
  780              7039              6916      .0006     .0006
  800              5965              5990      .0005     .0005
  840             18706             18810      .0016     .0017
  860              5317              5340      .0005     .0005
  870              8718              8728      .0008     .0008
  880              5383              5392      .0005     .0005
  920              7923              8074      .0007     .0007
  960             10683             10686      .0009     .0009
 1000             38947             39142      .0034     .0034
 1040              5941              5942      .0005     .0005
 1080              8674              8668      .0008     .0008
 1120            116991            117140      .0103     .0103
 1140              7397              7366      .0007     .0006
 1150              7344              7688      .0006     .0007
 1160             12564             12642      .0011     .0011
 1240             10636             10658      .0009     .0009
 1280             61991             61970      .0055     .0055
 1320             18886             19076      .0017     .0017
 1360              8536              8636      .0008     .0008
 1400              8445              8316      .0007     .0007
 1440             21550             21668      .0019     .0019
 1480              5482              5504      .0005     .0005
 1520             32097             32004      .0028     .0028
 1540              5658              5704      .0005     .0005
 1560             19610             19784      .0017     .0017
 1600            356513            357580      .0314     .0315
 1620              7174              7240      .0006     .0006
 1640             61959             62254      .0055     .0055
 1680             94960             94818      .0084     .0083
 1720             15632             15758      .0014     .0014
 1740              4997              4962      .0004     .0004
 1760             20410             20590      .0018     .0018
 1800              8559              8526      .0008     .0008
 1840             54746             54868      .0048     .0048
 1880             13564             13576      .0012     .0012
 1920            148763            149000      .0131     .0131
 1950              5608              5592      .0005     .0005
 1960             16384             16320      .0014     .0014
 2000             41510             41516      .0037     .0037
 2020             12936             13058      .0011     .0011
 2040              6543              6538      .0006     .0006
 2080             79683             79710      .0070     .0070
 2120             15159             15250      .0013     .0013
 2160            214329            214276      .0189     .0189
 2240             11164             11142      .0010     .0010
 2290              6548              6586      .0006     .0006
 2320             24132             24170      .0021     .0021
 2330              6847              6720      .0006     .0006
 2360             13986             13914      .0012     .0012
 2400             13753             13820      .0012     .0012
 2440              8357              8308      .0007     .0007
 2480              7248              7172      .0006     .0006
 2560             12481             12796      .0011     .0011
 2580              4983              5068      .0004     .0004
 2640             22594             22664      .0020     .0020
 2655              5515              5452      .0005     .0005
 2670              7455              7404      .0007     .0007
 2680             50917             51028      .0045     .0045
 2700             10349             10586      .0009     .0009
 2750              5485              5532      .0005     .0005
 2760             14713             14764      .0013     .0013
 2840             25777             25778      .0023     .0023
 2880              5146              5130      .0005     .0005
 2900              7587              8240      .0007     .0007
 2920              9813              9874      .0009     .0009
 2960             32245             32274      .0028     .0028
 2975              5495              5452      .0005     .0005
 3000             29989             30118      .0026     .0027
 3060              6047              6212      .0005     .0005
 3080              8804              8780      .0008     .0008
 3120             33753             33714      .0030     .0030
 3160             24554             24604      .0022     .0022
 3180              5665              5632      .0005     .0005
 3200             12916             12870      .0011     .0011
 3240             22320             22214      .0020     .0020
 3280             27454             27546      .0024     .0024
 3290              5275              5202      .0005     .0005
 3320             38388             38474      .0034     .0034
 3360            137202            137468      .0121     .0121
 3400              5293              5324      .0005     .0005
 3440             15471             15478      .0014     .0014
 3480             58360             58570      .0051     .0052
 3520              7501              7638      .0007     .0007
 3560             12644             12992      .0011     .0011
 3600             34456             34308      .0030     .0030
 3605              5683              5646      .0005     .0005
 3620              6948              6878      .0006     .0006
 3640             28015             28020      .0025     .0025
 3660              7147              7098      .0006     .0006
 3680              9200              9320      .0008     .0008
 3710              6369              6398      .0006     .0006
 3720             10581             10600      .0009     .0009
 3740              5193              5206      .0005     .0005
 3760             66510             66482      .0059     .0059
 3800              6155              6204      .0005     .0005
 3810             10879             10896      .0010     .0010
 3840             23796             23730      .0021     .0021
 3850              5156              5134      .0005     .0005
 3880              7584              7578      .0007     .0007
 3920              6149              6180      .0005     .0005
 3960              5648              5652      .0005     .0005
 3980             15983             16032      .0014     .0014
 4000             18103             18140      .0016     .0016
 4040             21136             21050      .0019     .0019
 4120             23238             23164      .0020     .0020
 4160              7237              7178      .0006     .0006
 4200              5594              5606      .0005     .0005
 4280             10144             10180      .0009     .0009
 4320             10907             11000      .0010     .0010
 4360              9640              9680      .0008     .0009
 4400             19768             19888      .0017     .0018
 4410             25188             25220      .0022     .0022
 4420              7637              7758      .0007     .0007
 4440             13673             13670      .0012     .0012
 4480            374759            375658      .0330     .0331
 4520             34217             34242      .0030     .0030
 4560              5195              5288      .0005     .0005
 4600             10527             10450      .0009     .0009
 4640              7605              7674      .0007     .0007
 4680              7494              7552      .0007     .0007
 4720             16222             16234      .0014     .0014
 4760              7959              8018      .0007     .0007
 4800              6558              6596      .0006     .0006
 4880             14216             14362      .0013     .0013
 4890              6675              6664      .0006     .0006
 4900             13661             13748      .0012     .0012
 4920             38803             38796      .0034     .0034
 5000             74465             74316      .0066     .0065
 5080             70220             70292      .0062     .0062
 5120            101965            102202      .0090     .0090
 5160             18343             18144      .0016     .0016
 5170             13418             13454      .0012     .0012
 5200              7033              7062      .0006     .0006
 5240             13618             13624      .0012     .0012
 5280              6403              6416      .0006     .0006
 5320              8954              8876      .0008     .0008
 5360             42744             42380      .0038     .0037
 5380            130094            130242      .0115     .0115
 5400              8466              8432      .0007     .0007
 5440              5290              5338      .0005     .0005
 5460             29880             30108      .0026     .0027
 5480             12002             11996      .0011     .0011
 5560             55174             55534      .0049     .0049
 5600            453031            454046      .0399     .0400
 5640             98364             98524      .0087     .0087
 5645              6045              5952      .0005     .0005
 5660             12925             12900      .0011     .0011
 5680             18244             18176      .0016     .0016
 5720             40024             40042      .0035     .0035
 5745             28524             28666      .0025     .0025
 5760              5599              5686      .0005     .0005
 5790              6125              6056      .0005     .0005
 5800              5852              5836      .0005     .0005
 5880             41733             41912      .0037     .0037
 5910              6181              6156      .0005     .0005
 5920             19898             19912      .0018     .0018
 5960             34958             35240      .0031     .0031
 6000             26449             26356      .0023     .0023
 6025              5891              5906      .0005     .0005
 6040             22358             22518      .0020     .0020
 6080             14542             14620      .0013     .0013
 6120             16653             16606      .0015     .0015
 6140              6500              6508      .0006     .0006
 6160            236537            236356      .0209     .0208
 6200             75599             76186      .0067     .0067
 6280            113336            113362      .0100     .0100
 6400              9162              9196      .0008     .0008
 6440             62216             62150      .0055     .0055
 6450              6631              6688      .0006     .0006
 6480             26547             26782      .0023     .0024
 6520             10873             10862      .0010     .0010
 6560              6301              6214      .0006     .0005
 6600              8554              8514      .0008     .0007
 6640             22814             22782      .0020     .0020
 6680             15653             15580      .0014     .0014
 6690              5830              5864      .0005     .0005
 6720              9713              9678      .0009     .0009
 6740              5539              5612      .0005     .0005
 6760             31652             31458      .0028     .0028
 6780             53528             53518      .0047     .0047
 6800             11240             11178      .0010     .0010
 6840             35119             35072      .0031     .0031
 6880             12497             12534      .0011     .0011
 6885              5316              5378      .0005     .0005
 6920             50846             50790      .0045     .0045
 6960             11533             11606      .0010     .0010
 6980              5447              5390      .0005     .0005
 7000              5055              5086      .0004     .0004
 7040            111687            111832      .0098     .0098
 7080             10361             10300      .0009     .0009
 7120             14525             14746      .0013     .0013
 7140              9292              9372      .0008     .0008
 7160             45673             46222      .0040     .0041
 7240             49617             49966      .0044     .0044
 7320             93052             93300      .0082     .0082
 7360            162854            162892      .0144     .0143
 7400             64832             64760      .0057     .0057
 7480             14969             14952      .0013     .0013
 7485              9419              9504      .0008     .0008
 7500             15012             14914      .0013     .0013
 7510             10110             10258      .0009     .0009
 7520             10082             10158      .0009     .0009
 7600             80482             79850      .0071     .0070
 7610              6418              6448      .0006     .0006
 7620              4983              5050      .0004     .0004
 7680             18902             18722      .0017     .0016
 7720              5105              4994      .0005     .0004
 7760              5551              5518      .0005     .0005
 7800             12166             12118      .0011     .0011
 7840             17099             17194      .0015     .0015
 7880              8871              8916      .0008     .0008
 7920              9259              9216      .0008     .0008
 7960              9227              9286      .0008     .0008
 8000             25884             25964      .0023     .0023
 8040              5113              5044      .0005     .0004
 8050              5671              5662      .0005     .0005
 8120             17384             17504      .0015     .0015
 8160             28846             28822      .0025     .0025
 8200             24278             24874      .0021     .0022
 8240              7471              7360      .0007     .0006
 8280             78512             78312      .0069     .0069
 8320              5667              5624      .0005     .0005
 8400             35757             35672      .0032     .0031
 8440              9268              9200      .0008     .0008
 8480             15423             15880      .0014     .0014
 8520             26551             26632      .0023     .0023
 8560             34304             34322      .0030     .0030
 8600              6924              6834      .0006     .0006
 8640              6423              6320      .0006     .0006
 8680             12722             12634      .0011     .0011
 8720             16766             16886      .0015     .0015
 8760              6675              6710      .0006     .0006
 8780             12341             12384      .0011     .0011
 8800              8626              8690      .0008     .0008
 8840            149775            149696      .0132     .0132
 8880              5145              5188      .0005     .0005
 8920              6887              6820      .0006     .0006
 8940              5614              5574      .0005     .0005
 8960             28739             28990      .0025     .0026
 9040             18306             18388      .0016     .0016
 9080              5980              6024      .0005     .0005
 9140              5937              5984      .0005     .0005
 9160             19736             19568      .0017     .0017
 9200              5264              5348      .0005     .0005
 9240              8112              8100      .0007     .0007
 9260              8703              8550      .0008     .0008
 9280             19106             19134      .0017     .0017
 9320             26622             26692      .0023     .0023
 9999           1320926           1323586      .1165     .1165

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