Changes

* Data from Processing the SDCdata:** Social criteria acquisitions announcement dates 1985 - presentFind SIC codes concordance to get NAICS for old data** Acquirer publicly traded ( must be AMEX, NASDAQ, or NYSE)** Target status Magic with CUSIPs : CUSIP is public or private ** Acquirer and target are U.S. firms.** Acq of 100 percent of the firm and Acq. completed** GVKEYa nine digit number (possibly ten, ) Seven issuer, two issue, one check

* Variable list for SDCCRSP processing notes: ** CUSIP Estimation window 250 days ending 30 days before the Acq. must be at least 50 continuous days before the 30 days window. ** Exchange Returns and ticker ** Company name ** Acq transaction value** Acq announcement date** Number of bidders** NAICS prices may contain codes for target . Import as var_char and Acq.** Addresses ** T* Variables for CRISP(daily) ** Stock price** Returns** reprocess?

* Variable for COMPUSTAT ( Everything 1980 to present) ** Acq market value of assetsOther notes:** NAICS codes** Sales** GVKEY** intangible assets** TOBIN's Q   Magic with CUSIPs : CUSIP is a nine digit number (possibly ten, ) Seven issuer, two issue, one check CRSP processing notes: estimation window 250 days ending 30 days before the Acq. must be at least 50 continuous days before the 30 days window. See page 9 of the paper for data processing notes. FROM  *Data dictionary for SDC MA: http://www.edegan.com/repository/DD-ThomsonSDCMA.txt