SQUARE D 8030-CRM510

SQUARE D 8030-CRM510 SY/NET MODULE 8030CRM510 NEW

SQUARE D 8030-CRM510 SY/NET MODULE 8030CRM510 NEW

SY/NET MODULE 8030CRM510 NEW

SY/NET MODULE 8030CRM510 NEW中國(guó)工業(yè)企業(yè)數(shù)據(jù)庫的使用現(xiàn)狀和潛在問題聶輝華江艇楊汝岱內(nèi)容提要在經(jīng)驗(yàn)研究中，企業(yè)級(jí)的微觀數(shù)據(jù)正受到越來越多的重視。中國(guó)工業(yè)企業(yè)數(shù)據(jù)庫成為國(guó)內(nèi)外學(xué)者研究中國(guó)企業(yè)行為和績(jī)效的主要數(shù)據(jù)庫之一。
　　但是該數(shù)據(jù)庫存在樣本匹配混亂、變量大小異常、測(cè)度誤差明顯和變量定義模糊等嚴(yán)重問題，忽視這些問題可能會(huì)導(dǎo)致研究結(jié)論錯(cuò)誤。本文介紹了該數(shù)據(jù)庫的基本情況和使用現(xiàn)狀，指出了該數(shù)據(jù)庫存在的缺陷，并根據(jù)現(xiàn)有研究提出了改進(jìn)建議。
　　一引言數(shù)據(jù)是經(jīng)驗(yàn)研究的細(xì)胞，因此數(shù)據(jù)質(zhì)量的好壞直接決定了經(jīng)驗(yàn)研究的活力。zui近十多年來，經(jīng)濟(jì)學(xué)界越來越重視使用微觀面板數(shù)據(jù)longitudinal micro－level da ta的研究。相對(duì)于宏觀數(shù)據(jù)或行業(yè)數(shù)據(jù)，微觀的企業(yè)數(shù)據(jù)或個(gè)體數(shù)據(jù)的優(yōu)勢(shì)是非常明顯的：*，微觀面板數(shù)據(jù)包含了更多信息，例如企業(yè)的所有制、規(guī)模和出口等狀態(tài)，這些信息對(duì)于企業(yè)行為的研究*；第二，微觀面板數(shù)據(jù)同時(shí)包含了時(shí)間維度和個(gè)體維度，有助于解決計(jì)量經(jīng)濟(jì)學(xué)中的個(gè)體異質(zhì)性問題，更容易保證估計(jì)的*性；

KOLON POWER SUPPLY IC693PWR321K MANUFACTURED UNDER LICENCE GE FANUC

OMRON PLC MODULES C200H-ID215 C200H-ID212 C200H-OC222 C200H-OC225

MITSUBISHI CC-LINK INPUT/ OUTPUT UNITS AJ65SBTB1-32D AJ65SBTB1-32T

SANYO DENKI BL SUPER ROBUSTSYN RBD2C-202

FESTO VALVE TYPE DSR-12-180-P

HONEYWELL MICRO SWITCH GKNC21 NEW NOT IT BOX LOT OF 6

HONEYWELL MICRO SWITCH GKNC30 NEW NOT IT BOX LOT OF 6

AUTONICS MULTI METER MT4Y-AA-4N LOT OF TWO

AUTONICS MULTI METER MT4Y-AV-4N LOT OF TWO

AUTONICS MULTI METER MT4Y-DV-41 LOT OF TWO

WEST N6100 TEMPERATURE CONTROLLER

GE FANUC PLC IC693MDL752E OUTPUT TTL 32PT WORKING

HANYOUNG DX2 TEMP. CONTROLLER DX2_KSWNR -50'C TO 1300'C LOT OF 2

HANYOUNG DX2 TEMP. CONTROLLER KSWNR KSC 1613 -50'C TO 1300'C LOT OF 2

RED LION DC MONITOR M2444B

GE FANUC PLC MODULE- IC655MDL512B INPUT MODULE 32 CIRCUITS NO SIDE COVER

FUJIKIN DIAHPRAGM VALVE LOT OF 4 TWO 067645 TWO 038818 INLET OUTLET DIA. 1/4in

OMRON S8PS-10024 POWER SUPPLY TESTED WORKING

HILSCHER GMBH DEVICENET PCI CARD CIF50-DNM, CIF50 BSL-DN V1.503

GE FANUC POWER SUPPLY IC693PWR321S TESTED WORKING, FREE SHIPPING!

SIEMENS SIMATIC,S7 1P 6ES7 -307-1BA00-0AA0

SIEMENS SIMATIC, 6ES5430-4UA13

OMRON SYSMAC MINI SK20 PROGRAMMABLE CONTROLLER SK20-C2DR-D PLC

MITSUBISHI AC SERVO DRIVE MR-C10A1 100W

SHIMADEN CONVERTER CP2MD-4613-0

SMC MGPM25-40 Compact Guide Cylinder

MOORE INDUSTRIES IPT2/4-20MA/3-27PSIG/35PSI-FA1 [DIN]

MOORE INDUSTRIES IPT2/4-20MA/3-27PSIG/35PSI-FA7 [DIN]