A method of estimating an employment level receiving a first set of payroll data that includes at least one payroll record associated with at least one entity and identifying a format associated with the at least one payroll record of the first plurality of payroll data. The format associated with the at least one payroll record of the first plurality of payroll data may be normalized to substantially conform to a format associated with a second set of payroll data. A regression coefficient associated with the normalized first set of payroll data may be calculated. An employment level is estimated based on the first set of normalized payroll data and the regression coefficient. The regression coefficient comprises a value indicative of a difference in growth rates between the first set of payroll data and the second set of payroll data and is based at least on a number of initial unemployment claims filed during a portion of a time period associated with the first set of payroll data.