2004 Improved frame quality

In the process of preparing the statistics "Labor Market and Pensions in the tax sources 2004", changes have been introduced to improve the quality of the information, managing to alleviate defects in the framework.

This has been achieved by using external sources of information to the tax authorities, completing and improving the quality of the data. Thus, the variables with empty units, Sex and Age, have experienced improvements, decreasing the number of invalid records, and, consequently, the number of imputations in these two variables has decreased. In the case of the variable "Age", calculated from the Birth Year, it has been found that, of an initial 3% of records with an invalid birth year, 0.2% of the total remained for the imputation process. In the case of the variable "Sex", of the 4.6% of the total invalid records, 2.1% remain pending imputation.

However, for statistical purposes there have been hardly any substantial changes in the distributions of the groups under study, both in their distribution by Age and by Sex.