20082009 Panel Advance Release 
ERRATUM 

Description:  20082009 ANES Panel Study: error in age summary variable der02, with likely effects on weights 
Posted:  2009July27 
20082009 ANES Panel Study: error in age summary variable der02, with likely effects on weights The following error has been identified in the 20082009 ANES Panel Study data. The variable der02, which indicates the respondent's age as of election day in 2008, contains erroneous age data for approximately 3 percent of cases. There are two problems with the variable: 1. There is a spike in the distribution of birth years at 1919, possibly due to data entry errors by respondents trying to type the first two digits of their birth year ("19") in a twodigit year field. This anomaly affects about 30 cases. 2. There is a computation error in the program code used to calculate der02 that affects about 70 cases. ANES will recalculate the der02 age variable. This age variable was used as part of the calculation of poststratified weights. After correcting der02, ANES will recalculate the weights. The proportion of cases whose age will differ will be small, so the difference between the original weights and the recalculated weights may also be small. ANES will release an updated data file with the corrected der02 variable and recalculated weights. 