Random or lrregular component 随机项 Erratic, Nonsystematic, Random, th esidual? Fluctuations Due to Random variations of 口 Nature 口 Accidents Short duration and Non-repeatingRandom or Irregular Component 随机项 • Erratic, Nonsystematic, Random, 慠 esidual?Fluctuations • Due to Random Variations of  Nature  Accidents • Short Duration and Non-repeating