Seasonality of Transportation Data - Census Issues - Planning

Figure 4

Figure 4a shows weighted monthly average values of the journey to work travel time variable for all respondents of the American Community Survey in Hampden County, Massachusetts from 1999 to 2001. The average value shown for each month is based on approximately 200 respondents from the county for the month.

FIGURE 4a - Three Year Averages and Weighted Three Year Aggregate Minutes Traveled to Work

Figure 4b gives a pictorial representation of how each month varies from the weighted average travel time obtained by aggregating all three years of data into one value. Each month varies from the overall mean by 1 ½ minutes or less.

FIGURE 4b - Monthly Variation from the Mean of Journey to Work Travel Times

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