Why Use This Data Source In Your Models?
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.
National Home Price Index - NOT SEAS ADJ
S&P Dow Jones Indices LLC
Index Jan 2000=100, Not Seasonally Adjusted
The data shows auto correlation, 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.
Data shows auto correlation 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
Auto Correlation Function
Auto Correlation Function After Differencing
Partial Auto Correlation Function
Seasonal and Trend Decompostion
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.
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