Detrend

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Detrend

To remove the general drift, tendency, or bent of a set of statistical data as related to time. Often accomplished by regressing a variable or a time index and perhaps the square of the time index and capturing the residuals. A stochastic detrend would be to subtract a moving-average (say for five years) from the value of the variable.

Detrend

The removal of a trend from the consideration of several variables. A detrend may be necessary to discover a company's true financial health. For example, one may detrend increased sales around Christmas time to see a more accurate account of a company's sales in a given year.
References in periodicals archive ?
See figure I for an explanation of the detrending method.
Given the lack of a structural interpretation of the error term, combined with the likely distortions introduced by the detrending filter, I do not want to put too much emphasis on the point estimate.
The problem with linear detrending, however, is that it is not well supported by the data.
Also, the slope of the line relating the elevation profile detrending length to some power of the detrended root mean squared (RMS) value is used.
We measure the business cycle using seven popular detrending methods, and a turning point rule that does not involve a trend-cycle decomposition per se.
But for the early '60s and the late '90s the message would be quite different, with lower interest rates indicated by the gap based on the log-linear detrending. According to the Figure 13 version of the Taylor rule, the federal funds rate was too high by about 300 basis points throughout 1995-1998!
To meet the assumption of a stationary time series (Gottman 1981), cross-correlation analysis was performed on the residuals of each pollen record after detrending it with the highest order polynomial in which all parameters were significant at the P [less than] 0.05 level.
(8.) The complete set of filters considered were (i) demeaning and detrending. (ii) firs-differenced, (iii) demeaning and detrending the first-differenced data, (iv) using first-differenced output and the second-differenced price level, and (v) demeaning and detrending first-differenced output and second-differenced price level.
Dating the peak of the cycle by reference to a subsequent absolute decline in output no longer seems such a 'rare event' activity as it did before the first oil shock; moreover, the intervening popularity of the growth cycle has suffered from the realization that detrending techniques may spuriously create cycles of their own and shift the timing of the turning points in undesirable ways.
Watson, Mark W "Univariate Detrending Methods with Stochastic Trends." Journal of Monetary Economics, 18(1), 1986, 49-75.
Two series - investment and net exports - are not logged, but taken as a ratio to GDP in order to convert to proportionate measures before detrending.
Effects of detrending and rescaling on correspondence analysis: solution stability and accuracy.