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. sort price //°´¼Û¸ñ´ÓµÍµ½¸ßÖØÐÂÅÅÐò

. by foreign: sum price weight *not sorted

/* ϵͳÌáʾûÓÐÅÅÐò£¬ÕâÊÇÒòΪby varlist ÔÚÖ´ÐÐʱҪÇóÄÚ´æÖеÄÊý¾ÝÊǰ´ÕÕ

by ºóÃæµÄ±äÁ¿ÅÅÐòµÄ¡£µ±ÎÒÃÇÓÃsort price ÖØÐÂÅÅÐòºó£¬¾Í´òÂÒÁËÔ­À´°´ÕÕ

foreign µÄÅÅÐò£¬ËùÒÔ³öÏÖÁË´íÎóÌáʾ¡£¸üÕýµÄ°ì·¨ÊÇ£º*/

. sort foreign //°´¹ú²ú³µºÍ½ø¿Ú³µÅÅÐò . by foreign: sum price weight

*¸ü¼òÂԵķ½Ê½ÊǰÑÁ½¸öÃüÁîÓÃÒ»¸ö×éºÏÃüÁîÀ´Ð´¡£

. by foreign, sort: sum price weight

Èç¹û²»Ïë´ÓСµ½´óÅÅÐò£¬¶øÊÇ´Ó´óµ½Ð¡ÅÅÐò£¬ÆäÃüÁîΪ gsort¡£

.gsort - price /°´¼Û¸ñ´Ó¸ßµ½µÍÅÅÐò . gsort foreign ¨Cprice /*ÏȰѹú²ú³µ¶¼ÅÅÔÚ

ǰ£¬½ø¿Ú³µÅÅÔÚºóÃæ£¬È»ºóÔÚ¹ú²ú³µÄÚÔÙ°´¼Û¸ñ´Ó´óСµ½ÅÅÐò£¬ÔÚ

½ø¿Ú³µÄÚ²¿£¬Ò²°´´Ó´óµ½Ð¡ÅÅÐò*/

2.5 ¸³Öµ¼°ÔËËã=exp

[by varlist:] command [varlist] [=exp] [if exp] [in range] [weight] [, options]

Àý£ºÉú³ÉÒ»¸öеļ۸ñ±äÁ¿nprice£¬¸Ã±äÁ¿µÄȡֵΪԭÆû³µ¼Û¸ñ±äÁ¿price µÄ»ù´¡ÉÏÕÇ10 Ôª . cd d:/stata9 . use auto, clear

. gen nprice=price+10 //Éú³ÉбäÁ¿nprice£¬ÆäֵΪprice+10 . list price nprice //±È½ÏÒ»ÏÂÁ½¸ö±äÁ¿µÄȡֵ

/*ÉÏÃæµÄÃüÁîgenerate(ÂÔдΪgen) Éú³ÉÒ»¸öеıäÁ¿£¬Ð±äÁ¿µÄ±äÁ¿ÃûΪ nprice,еļ۸ñÔÚÔ­¼Û¸ñµÄ»ù´¡ÉϾùÔö¼ÓÁË10 Ôª¡£

. replace nprice=nprice-10 /*ÃüÁîreplace

ÔòÖ±½Ó¸Ä±äÔ­±äÁ¿µÄ¸³Öµ£¬nprice µ÷¼õºóÓëprice ±äÁ¿È¡ÖµÏàµÈ*/

. list price nprice //ÔٱȽÏÒ»ÏÂÁ½

¸ö±äÁ¿£¬ÏàµÈ¡£

2.6 Ìõ¼þ±í´ïʽif exp

[by varlist:] command [varlist] [=exp] [if exp] [in range] [weight] [, options]

Àý£ºÈôÖ»Ïë²é¿´¹ú²ú³µµÄÆ·ÅÆºÍ¼Û¸ñ£¬Ôò¼ÓÈëɸ

Ñ¡Ìõ¼þif foreign==0 */

. cd d:/stata9

. use auto, clear

. list make price if foreign==0

*Ö»²é¿´¼Û¸ñ³¬¹ý1 ÍòÔªµÄ½ø¿Ú³µ£¨Í¬Ê±Âú×ãÁ½

¸öÌõ¼þ£©£¬Ôò

. list make price if foreign==1 & price>10000 *²é¿´¼Û¸ñ³¬¹ý1 ÍòÔª»òÕß½ø¿Ú³µ£¨Á½¸öÌõ¼þÈÎ

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. list make price if foreign==1 | price>10000 *·ÖÀàÐͲ鿴¼Û¸ñ³¬¹ý1 ÍòÔªµÄÆû³µµÄÆ·ÅÆºÍ¼Û

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. by foreign, sort: list make price if price>10000

2.7 ·¶Î§É¸Ñ¡in range

[by varlist:] command [varlist] [=exp] [if exp] [in range] [weight] [, options]

Èç¹ûÒª¼ÆËã½ÏµÍµÄǰ10 ̨³µµÄƽ¾ù¼Û¸ñ£¬ÔòÒª

ÏȰ´¼Û¸ñÅÅÐò£¬È»ºó½ö¶Ôǰ10

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. sum price in 1/10 if foreign==0

2.8 ¼ÓȨweight

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ÈÎÎñ£ºÏ±íÊÇ2005 Äêºþ±±Ê¡¸ß¿¼640 ·Ö¼°ÒÔÉϳɼ¨Ò»·ÖÒ»¶ÎµÄÈËÊýͳ¼Æ£¬µÚÒ»

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