模型是 WCchange=a+a1OCFt-1+a2OCFt+a3 OCFt+1+a4 Revchange+a5PPE+残差
之前看到有用rolling的命令,于是我写了rolling, window(1):reg WCchg OCF1 ocf OCF2 REVchg ppe这样的指令,但是回归样本数据发现最后得到的系数都是空值,且没有残差,想请教各位想实现这样的循环回归应该用怎么样的命令比较好。感激不尽!
附上样本数据
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input float(WCchg OCF1 ocf OCF2 REVchg ppe)
- . .02016386 .04639781 .06623692 .009530522 .004229233
- . .03626643 .05177349 .06847152 .006958446 .00356234
- . .0405154 .05358246 .036194142 .001216069 .002853518
- . .034879547 .0235606 -.015644059 .003540618 .0025918835
- . .018636404 -.01237443 .1592621 .009877257 .003020267
- . -.009168095 .11799575 .05820723 .006237668 .0022454192
- 0 .09799033 .04833857 .013351452 .006529194 .0019478007
- 0 .04168051 .01151245 -.0008302094 .008794491 .0017331644
- 0 .009852734 -.0007105206 .004275964 .00858695 .0018630738
- . -.0006345099 .0038185266 -.04127442 .0040694117 .002889696
- . . . . . .
- . -.036056284 -.12444779 -.0004071887 .2107777 .006858115
- .018881677 -.08782148 -.00028734872 .0778564 .04598316 .010646333
- .0798052 -.0002039682 .05526466 .01336177 .04711761 .008098428
- .06272203 .04266016 .010314282 .015626058 .008449823 .005622564
- .02036391 .007527281 .011403773 .012536046 .07088664 .005369306
- .05421022 .008742235 .009610246 .004962174 .08081748 .004158444
- .02295866 .008399267 .0043368945 .09405845 .072818235 .004801044
- .011053477 .0035284134 .07652414 .029428717 .02011775 .0042335624
- .011666018 .0623185 .023965687 .05909437 .07342506 .007344548
- .016136497 .018063309 .04454034 .09267237 .05057642 .007667039
- . . . . . .
- . -.04822859 -.03736561 .007676644 -.02789166 .16345134
- -.1852895 -.034731723 .007135521 .2327855 .01431444 .14413777
- .04979254 .008114639 .26472768 -.06668511 .09525196 .15065956
- .064554386 .2183409 -.05500023 .09074445 .3338692 .1141785
- .03894933 -.06224637 .1026998 .09313807 -.3013673 .1942003
- .16595745 .0883354 .08011106 -.09598295 .10427232 .21221684
- .03914519 .06612518 -.07922613 -.020836184 -.09254108 .1546832
- .04542349 -.065672494 -.017271629 .028906055 .02441929 .118039
- .02839189 -.01969417 .03296046 .5264415 .1417996 .13445827
- -.07316714 .02775018 .4432234 .04326322 .50100714 .10026784
- . . . . . .
- . .0018229845 .0021573561 -.08641735 -.01990224 .06108591
- .08769506 .0022670003 -.09080938 .005858026 -.13710067 .05864355
- -.05263478 -.0939774 .006062392 .0045673028 -.04885321 .0644797
- .02838653 .006304084 .00474939 .02695829 .072906524 .06031991
- .0002435421 .00468847 .0266125 .13735442 -.05640308 .020079965
- .08684235 .02839523 .14655559 -.09122678 .0293041 .019646
- -.014356004 .1336191 -.08317417 -.006832839 -.035259172 .018449709
- -.05844392 -.066053376 -.005426349 .00933869 .0004229163 .015326136
- .12632018 -.004713914 .008112598 -.0954637 .016101586 .019133164
- -.0259275 .006186637 -.072800264 -.09529898 .15578887 .014722386
- . . . . . .
- . .05612111 -.18209 -.308612 -.05214736 .007255851
- -.09556738 -.1253649 -.21247242 .05747905 -.0003572595 .0043793097
- .3638331 -.1882879 .05093654 .15001275 .11421751 .0014084
- -.12184972 .04732957 .1393899 .1537213 .06278039 .0009529257
- -.2119962 .12135322 .13383019 .24359567 .027975043 .0007775057
- .13355614 .13106139 .23855595 -.09735214 .05324945 .0005894926
- .13478458 .20682055 -.08440126 -.104088 .14548376 .00051164615
- -.04892737 -.07853785 -.09685694 -.02678785 -.2013196 .0003692988
- .17195988 -.08810557 -.02436747 .137093 .10637145 .00027078466
- .02442297 -.02350017 .13221352 .0547049 -.022867164 .0002198849
- . . . . . .
- . .033939727 .12287947 .05395588 -.01190824 .24501728
- .10238878 .158173 .06945313 -.033600137 -.04783075 .1900762
- .13565342 .08104367 -.03920742 .05909624 -.05445766 .2109871
- .10606118 -.05095232 .07679898 -.04678521 .027507564 .25617874
- .5614414 .04966752 -.030256983 -.4445464 .03929668 .15802827
- .035806358 -.033288077 -.48908025 .3781859 .28889397 .16700976
- .031958673 -.3391979 .2622879 .017134026 -.13370872 .11197184
- .05460596 .3389841 .02214422 .4172031 -.028563166 .13517939
- .0533553 .021080514 .3971625 -.04042004 -.165878 .12049402
- .00072279 .51430655 -.05234202 .004911995 -.13022417 .1496211
- . . . . . .
- . .07108476 .09509496 .0090437 -.005788106 .07989953
- .03108395 .09344923 .008887189 .04671525 .019259537 .07161845
- .012429 .008980611 .04720632 -.005369183 -.017079506 .022054745
- .029553054 .04726722 -.005376109 -.013151696 .0043959753 .02253009
- .0028548024 -.0012173817 -.0029781084 .25056466 .01024648 .0043763733
- .12801924 -.0029269094 .246257 .1897524 .9021646 1.0372362
- .09023724 .13458869 .10370681 .10668579 -.0419807 .52236944
- .006629151 .031679373 .03258936 -.0343751 .001296541 .14564869
- .19438767 .01549577 -.016344864 -.012660102 .22283295 .09655735
- .2000766 -.010157563 -.007867658 -.00742364 .08143312 .02562869
- . . . . . .
- . .04738291 -.01688097 .072118364 -.09364387 .14460017
- -.005982195 -.0146711 .06267743 .09523173 .1414769 .13434842
- .06792964 .05191062 .0788727 -.072800145 .04682685 .11228676
- .1452405 .06587202 -.06080042 -.0858749 -.005455537 .0891948
- .02748764 -.05055603 -.07140566 .030240225 .07315738 .08520268
- -.0794043 -.065216206 .027618997 .006332882 -.0032023124 .09225509
- -.05795145 .025144495 .005765492 .03402787 .009351144 .11330543
- .1144507 .005069667 .029921126 .00079345 .009862838 .10430827
- .016283037 .02611584 .0006925413 -.000669171 .0321004 .12393729
- -.007338124 .0005566318 -.00053784787 .017287828 .068739854 .13216452
- . . . . . .
- . -.071893826 .10252692 -.028273355 .13965483 .17430805
- .04792377 .08833428 -.02435952 .04422678 -.036979523 .12993412
- .06591126 -.03044469 .05527492 -.033643853 .12858358 .16185823
- .0007502593 .04871348 -.029650144 .02772303 .021336604 .12972938
- -.02783653 -.0308396 .02883517 -.009744947 .14244233 .17302604
- .009359878 .01029421 -.0034789636 .006696771 .006492381 .05660763
- 1.0576032 -.004218909 .008121115 -.23120594 .33374795 .0836599
- -.030802514 .0013669495 -.03891668 -.12512034 -.04259118 .015513373
- .24443306 -.04257134 -.13687035 -.028574985 .25646642 .020183725
- -.0803789 -.09372826 -.019568034 .13627432 .0232252 .016850745
- . . . . . .
- . -.06317859 -.0647543 -.012625527 .011205178 .05998603
- end