Definition of Filters: A filter is a way of treating or adjusting data before it is analyzed.

Examples are the Hodrick-Prescott filter or Kalman filter.

More exactly, a filter is an algorithm or mathematical operation that is applied to a time series sample to get another sample, often called the 'filtered' data. For example a filter might remove some high-frequency effects from the data; or detrend it; or remove seasonal frequencies but leave monthly frequencies in. (Econterms)

Terms related to Filters:

• Hodrick-Prescott filter
• Kalman filter