Transcription of Guidelines for Working With Small Numbers
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Guidelines for Working With Small Numbers
1 Department of Health Agency Standards for reporting Data with Small Numbers Revision Date: May 2018 Primary Contact: Cathy Wasserman, PhD, MPH, State Epidemiologist for Non-Infectious Conditions Secondary Contact: Eric Ossiander, PhD Purpose What is new, and how does this affect public health assessment? Scope of the "Standards for Working with Small Numbers " Summary Small Number Standard Reliability Recommendation Summary Graphic Background Why are Small Numbers a concern in public health assessment? What constitutes a breach of confidentiality? Why do we question the stability of statistics based on Small Numbers ? Why do we have a new standard? Working with Small Numbers General Considerations Assessing Confidentiality Issues Know the identifiers Examine numerator size for each cell Consider the proportion of the population sampled Consider the nature of the information How to Meet the Standard to Reduce the Risk of Confidentiality Breach General approach Aggregation Cell suppression Omission of stratification variables Exceptions to the Small Numbers Standard Considerations for Implementing Suppression Rules that Exceed the Standards Assessing and Addressing Statistical Issues What is the relative standard error (RSE)?
these standards for data reporting. ... breach of confidentiality can occur if knowing which category a person falls in on one margin (i.e. row or column) of the table allows a table reader to ascertain which category the person falls in on the other margin. The section
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