S&P Dow Jones Indices LLC
Index Jan 2000=100, Not Seasonally Adjusted
S&P/Case-Shiller U.S. National Home Price Index measures the retail value of single-family homes. This indicates overall economic strength as well as housing supply and demand.
The data shows autocorrection, seasonality and a non-normal distribution. The data should be differenced and seasonally adjusted. While the Arcsin transformation, provides the best normality, the Log variable will also perform well.
Data is unable to be distributed by time or geography. The roll up method used is Weighted Average.
National Home Price Index - NOT 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 = 0.18 p-value = 0.02 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 -0.10 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)
S&P Dow Jones Indices LLC, S&P/Case-Shiller U.S. National Home Price Index [CSUSHPINSA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CSUSHPINSA, December 15, 2019.