U.S. Bureau of Labor Statistics
Thousands of Persons, Not Seasonally Adjusted
Total employees in truck transportation measures the number of persons 16 years of age or older working in truck transportation positions in the US. This indicates population size and occupation opportunity.
The data shows autocorrection and a non-normal distribution. The data should be differenced. While the Order Norm transformation, provides the best normality, the Untransformed variable will also perform well.
Data is able to be distributed by time but not by geography. The roll up method used is Sum.
Truck Transportation Employees - Seas Adj
Auto Correction Function
Auto Correlation Function After Differencing
Partial Auto Correlation Function
Seasonal and Trend Decompostion
Data shows autocorrectation indicating a need for differencing
The ACF indicates 1 order differencing is appropriate.
Further differencing is reccommended
The Kwiatkowski-Phillips-Schmidt-Shin (KPSS) test, KPSS Trend = 0.42 p-value = 0.01 indicates that the data is not stationary.
The Shapiro-Wilk test returned W = 0.95 with a p-value =0.00 indicating the data does not follow a normal distribution.
A skewness score of -0.12 indicates the data are fairly symmetrical.
Hartigan's dip test score of 0.05 with a p-value of 0.15 inidcates the data is unimodal
Statistics (Pearson P/ df, lower => more normal)
U.S. Bureau of Labor Statistics, All Employees: Transportation and Warehousing: Truck Transportation [CES4348400001], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CES4348400001, December 15, 2019.