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[2005.05.16] HIT:2939
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[´äº¯] ±³¼ö´Ô²² ÆгΠµ¥ÀÌÅÍ ºÐ¼® °ü·Ã Áú¹® µå¸³´Ï´Ù. |
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1-1. ÀÏ´ÜÀº »çÀüÀû ÆÇ´Ü¿¡ µû¶ó ºÐ·ùÇÕ´Ï´Ù. ±× µÚ ±»ÀÌ »çÈÄÀûÀ¸·Î °ËÁ¤À» ÇÏ°í ½ÍÀ¸¸é À̸¥¹Ù Wu-Hausman ¹æ½Ä¿¡ ÀÇÇØ °ËÁ¤ÇÒ ¼ö ÀÖ½À´Ï´Ù. ±× °ËÁ¤¹æ½ÄÀÇ ¿äÁö´Â, ¿¹ÄÁ´ë W°¡ µµ±¸º¯¼öÀÇ ÀÚ°ÝÀ» °®Ãß°í Àִ°¡ ±×·¸Áö ¾ÊÀº°¡¸¦ °ËÁ¤ÇÒ ¶§ ´ÙÀ½ µÎ °³ÀÇ ÃßÁ¤·®À» ºñ±³ÇÕ´Ï´Ù. Çϳª´Â W¸¦ µµ±¸º¯¼ö¿¡¼ Á¦¿ÜÇÏ°í ´Ù¸¥ µµ±¸º¯¼öµé¸¸À» ÀÌ¿ëÇؼ ±¸ÇÑ µµ±¸º¯¼ö ÃßÁ¤·®ÀÌ°í ¶Ç´Ù¸¥ Çϳª´Â W¸¶Àúµµ µµ±¸º¯¼ö·Î ÀÌ¿ëÇؼ ±¸ÇÑ µÎ±¸º¯¼öÃßÁ¤·®ÀÔ´Ï´Ù. ÀÌ µÑÀ» ºñ±³Çϸé W°¡ µµ±¸º¯¼ö¶ó´Â ±Í¹«°¡¼³ ÇÏ¿¡¼´Â µÎ ÃßÁ¤·®ÀÇ È®·ü±ØÇÑÀÌ °°°Ô µÇ°í ±Í¹«°¡¼³ÀÌ ¼º¸³ÇÏÁö ¾ÊÀ¸¸é È®·ü±ØÇÑÀÌ ´Þ¶óÁö¹Ç·Î µÎ ÃßÁ¤랼ÀÇ Â÷ÀÌ°¡ 0 º¤ÅÍÀÎÁö¸¦ °ËÁ¤ÇÏ¿© W°¡ µµ±¸º¯¼ö°¡ µÇ´ÂÁö °ËÁ¤ÇÒ ¼ö ÀÖ½À´Ï´Ù. (º¸´Ù ÀÚ¼¼ÇÑ »çÇ×Àº Hausman and Taylor, Econometrica, 1981 ÂüÁ¶)
1-2. ¼ö¾÷½Ã°£ÀÇ ³» °ÀǸ¦ ±×´ë·Î Çؼ®Çϸé ÀüÇô time varying ÇÏÁö ¾Ê´Â °æ¿ì¿Í Á¶±ÝÀÌ¶óµµ time varying ÇÏ´Â °æ¿ì·Î ³ª´©¾î ³íÀǸ¦
Àü°³Çß½À´Ï´Ù. Çö½ÇÀûÀ¸·Î´Â Á¶±Ý¸¸ º¯ÈÇÑ °Í°ú ÀüÇô º¯ÇÏÁö ¾Ê´Â °ÍÀÇ Â÷ÀÌ°¡ ¹«¾ùÀΰ¡ÀÇ ¹®Á¦Àε¥ ±× ´ë´äÀº »óȲ¿¡ µû¶ó ´Ù¸£°í ÁÖ°üÀûÀ¸·Î ÆÇ´ÜÇÒ ¼ö¹Û¿¡ ¾ø½À´Ï´Ù. °´°üÀûÀ¸·Î ½ÃµµÇغ¼ ¸¸ÇÑ °ÍÀº µÎ °¡Áö ¹æ½ÄÀ¸·Î ó¸®ÇÏ°í °¢ °æ¿ì¿¡ ÃßÁ¤ÀÌ µÇ´ÂÁö »ìÆ캸°í ÃßÁ¤ÀÌ µÇ¸é µÎ ¹æ½Ä¿¡ µû¸¥ ÃßÁ¤Ä¡¸¦ ºñ±³ÇØ º¸¸é µÇ°ÚÁö¿ä.
2. ÀÌ ¹®Á¦¿¡ ´ëÇÑ ´äÀÌ attrition bias¿¡ ´ëÇÑ ¸¹Àº ³í¹®ÀÇ ³»¿ëÀÔ´Ï´Ù. ³ª ½º½º·Î »ý°¢ÇÑ, ÀÌ ¹®Á¦¿¡ ´ëÇÑ ´äÀº ³» ³í¹®, "New Approach to the Atrition Problem" (a chapter in a book published by Cambridge Univ Press)¿¡ ÀÖ½À´Ï´Ù. °£´ÜÈ÷ ¿©±â¼ ´ë´äÇÒ »çÇ×ÀÌ ¾Æ´Õ´Ï´Ù.
3. one-wayµç two-wayµç ÇÊ¿ä¿¡ µû¶ó ÀûÀýÇÑ ¸ðÇüÀ» »ç¿ëÇÏ´Â °ÅÁö¿ä. ÀÌ ¹®Á¦´Â ÀÌ¹Ì ¼ö¾÷½Ã°£¿¡ ¾ð±ÞÇÑ ¹Ù Àִµ¥ Àç·ÐÇϸé, Åë»óÀÇ ÆгÎÀÚ·á´Â ½Ã°£ÀÇ ±æÀÌ°¡ ª°í Ⱦ´Ü¸éÀ¸ ¤Ó±æÀÌ°¡ ±æ±â ¶§¹®¿¡ À̸¥¹Ù individual effect¸¦ ÇϳªÀÇ factor·Î ÆÛ¸®ÇÏ´Â ¹Ý¸é ´Ù¸¥ factor°¡ µÉ ¼ö ÀÖ´Â ½Ã°£È¿°ú´Â Åë»óÀûÀ¸·Î time dummyµé·Î °£´ÜÈ÷ ó¸®ÇÒ ¼ö Àֱ⠶§¹®¿¡ À̸¦ Ãß°¡ÀûÀÎ factor·Î ¸ðÇüÈÇÏÁö ¾ÊÀ» »ÓÀÔ´Ï´Ù. Âü°í·Î ÇϳªÀÇ factor¸¸ error termÀÇ ÀϺηΠ¹Ý¿µ½ÃŲ ¸ðÇüÀÌ one factor modelÀÌ°í µÎ °³ÀÇ factor¸¦ ±³¶õÇ׿¡ ¹Ý¿µ½ÃŲ ¸ðÇüÀÌ two-factor model ÀÔ´Ï´Ù. |
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