Clinical importance of directional statistics for electrocardiographic differentiation of smoking habits.

摘要: Summary Statistical methods for the analysis of directional data are relatively recent origin and have not been generally applied in clinical investigations where they appropriate. This study compares spherical means standard deviations polarcardiographic variables with linear same a typical industrial cohort male white collar workers. Normal subjects were classified by smoking status independent evidence presence CHD, both statistics to compare PCG these groups. Directional more accurately define variances heart vectors thereby permit reliable differentiation directions, or angles aid diagnosis.