• Data privacy, redaction

    The Delaware Department of Education (DDOE) values data transparency as well as security. DDOE complies with all federal and state data standards and laws, including the Family Educational Rights and Privacy Act (FERPA). Individuals and organizations with access to DDOE data must have systems in place to ensure security, sign a memorandum of understanding and align their work with DDOE data security policies.

    DDOE redaction rules

    While data used by DDOE, districts and charter schools is comprehensive, data presented to the public must be redacted – or masked – to avoid unintentionally identifying students. When reporting data to the public, DDOE requires the following data be redacted. Please access these data definitions for assistance.

    • DDOE Redacts the following risky cell values:
      • Any cell whose population value is less than fifteen (15), regardless of the cell’s value
      • Any cell whose corresponding population value is at or above fifteen (15), but whose cell value is less than five (5)
      • Any cell whose corresponding population is at or above fifteen (15), but whose cell value is within five (5) of the population
    • DDOE redacts any non-risky cell value to ensure that there are at least two (2) redacted cells within any mutually exclusive group reported
    • DDOE applies redaction based on cell and/or population values only
    • Redacted data may appear as:
      • a dash (-)
      • a space
      • an asterisk (*)
      • "Protected"
      • "<X" (or ">X") where X is a number below (or above) the risk of disclosure
      • CSC or Complementary Suppression by Category – a non-risky cell in a table was also redacted in order to prevent the value of a risky cell from being calculated by subtracting the reported values from the column total
      • CSG or Complementary Suppression by Group – a non-risky cell in a table was also redacted in order to prevent the value of a risky cell from being calculated by subtracting the reported values from the row total
Last Modified on November 5, 2019