tailieunhanh - Lean Explanations Supply Chain Comprehensive_14

Tham khảo tài liệu 'lean explanations supply chain comprehensive_14', khoa học xã hội, kinh tế chính trị phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 152 o Implementing Lean Six Sigma Throughout the Supply Chain Shipments Boxplot of Daily Shipments 28000 26000 24000 22000 20000 18000 16000 14000 Histogram of Daily Shipments 12000 80 10000 70 60 50 p O-40 D it 30 20 10 0 1200014000160001800020000220002400026000 Daily Shipmalts Figure Daily shipments data analysis. had hoped that this time series would provide some interesting insight into a trend based on seasons. For the arrive-on-schedule AOS metric the team was surprised to nd a signi cant drop at the end of the year. The team thought that this might be due to bad weather that made the trucks run late. However they could not conclusively identify the cause. Therefore the team made a special note that further analysis needed to be performed. The team next examined the time-series trend for mean dispatch time. Again the team noted a change toward the end of the year. Anita had a hunch that the average dispatch time was taking longer because the volume of shipments was increasing during the holidays. However the time series did not provide conclusive Measure Phase o 153 D D 100 99 98 97 96 95 94 93 Histogram of LOS Boxplot of LOS AOS LOS AOS 70 60 Histogram of AOS 70 ạị 40 ST 30 20 10 60 50 o s 40 2 30 20 10 o 0 . . . . . . __ 0 94 95 96 97 98 99 LOS AOS 10 Figure AOS and LOS data analysis. evidence of the relationship. Therefore the team also needed to analyze this metric in further detail. Using the same data from the Trailer Plan log database the team created histograms that were used to determine whether the data was normal or centered and how wide the distributions were. Figures Data Figures show the histograms and summary statistic for each metric. Anita noted that the data on daily shipments did not appear to be one distribution but probably several distributions. The data to the right above 20 000 daily shipments seemed to follow more of a .