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V.14:4 (177): SIDEBAR: Converting Absolute Data to Change in Log of Price
V.14:4 (177): SIDEBAR: Converting Absolute Data to Change in Log of Price
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CONVERTING ABSOLUTE DATA TO
CHANGE IN LOG OF PRICE
Sidebar Figure 1 is a sample of weekly interest rate and S&P 500 index data and the formula used to convert absolute interest rate data to changes in logs. Formulas first calculate the log of price and then subtract the week-earlier value from the current week value. Change in log of interest rates and the S&P index is the data used throughout.
ASSESSING STATIONARITY
1. Divide the range of data into five to 10 equally sized bins so that each observation falls into a bin. The two bins at the upper and lower extremes of the range should be defined so they are unbounded on the side of the bin away from the mean.
Sidebar Figure 1 is a sample of weekly interest rate and S&P 500 index data and the formula used to convert absolute interest rate data to changes in logs. Formulas first calculate the log of price and then subtract the week-earlier value from the current week value. Change in log of interest rates and the S&P index is the data used throughout.
ASSESSING STATIONARITY
1. Divide the range of data into five to 10 equally sized bins so that each observation falls into a bin. The two bins at the upper and lower extremes of the range should be defined so they are unbounded on the side of the bin away from the mean.
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