U.S. Bureau of Labor Statistics
Producer Price Index
Index 1982=100, Not Seasonally Adjusted
The producer price index for wood pulp represents the average movement in selling prices from domestic production over time. This indicates supply and demand for wood pulp and its inputs.
The data shows autocorrection and a non-normal distribution. The data should be differenced. While the Order Norm transformation, provides the best normality, the Arcsin variable will also perform well.
Data is unable to be distributed by time or geography. The roll up method used is Weighted Average.
PPI: Wood Pulp - Not Seas Adj, Index 1982 = 100
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 = 0.48 p-value = 0.01 indicates that the data is not stationary.
The Shapiro-Wilk test returned W = 0.89 with a p-value =0.00 indicating the data does not follow a normal distribution.
A skewness score of 0.22 indicates the data are fairly symmetrical.
Hartigan's dip test score of 0.03 with a p-value of 0.84 inidcates the data is unimodal
Statistics (Pearson P/ df, lower => more normal)
U.S. Bureau of Labor Statistics, Producer Price Index by Commodity for Pulp, Paper, and Allied Products: Wood Pulp [WPU0911], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WPU0911, November 8, 2019.