In reply to martin larson.

:-) It's actually hard to find example data that has a substantial number of missing values! Many people artificially "insert" missing values into complete data, but I wanted to use real data.

Thank you, Prof Larson, for your 20+ years of service to the Framingham study. The investigation of major risk factors that contribute to cardiovascular disease is ranked by the CDC as one of the 10 greatest public health achievements of the 20th century.