. The Bell System technical journal . < c 1 a. ^ 150 140 - • RANGE -2(7 • ~-- ) 135 - 130 1 1 1 ! 1 1 3 4 5 NUMBER OF WEEK Fig. 4—Seasonal trend in holding time averages, 105 9-12 hours, Newark of weeks can be noted by eye. In the case illustrated there appears noconsistency of movement. Applying the identical test used in the previousparagraph for the day-of-the-week changes, we find in Fig. 4C that in thefirst five-week period no movements of significance took place. However,the sixth week, which followed the first five after an interval of aboutsix weeks, showed a significant
. The Bell System technical journal . < c 1 a. ^ 150 140 - • RANGE -2(7 • ~-- ) 135 - 130 1 1 1 ! 1 1 3 4 5 NUMBER OF WEEK Fig. 4—Seasonal trend in holding time averages, 105 9-12 hours, Newark of weeks can be noted by eye. In the case illustrated there appears noconsistency of movement. Applying the identical test used in the previousparagraph for the day-of-the-week changes, we find in Fig. 4C that in thefirst five-week period no movements of significance took place. However,the sixth week, which followed the first five after an interval of aboutsix weeks, showed a significant drop suggesting the approach of a lower 372 BELL SYSTEM TECHNICAL JOURNAL level of traffic. The traffic engineer would probably decide to schedule hisholding time observations during the weeks numbered one to five determined something as to the character of the holding timetrends, if any, with hours of the day, with days
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
