Testing a Time Series for Difference Stationarity

Testing stationarity of functional time series

Economic and financial data often take the formof a collection of curves observed consecutively over time. Examples include, intraday price curves, yield and term structure curves, and intraday volatility curves. Such curves can be viewed as a time series of functions. A fundamental issue that must be addressed, before an attempt is made to statistically model such data, is whether these curves...

Stationarity Testing in High-Frequency Seasonal Time Series

Deciding whether seasonality is of a stochastic nature, and thus slowly changing over time, or deterministic and thus repeating in the same way each season can have a substantial impact on forecast accuracy. Tests for stochastic seasonality, called seasonal unit root tests, have been developed for certain common seasonal periods, like 12 (monthly data) 4 and 2, but until now have not been avail...

Stationarity in OWD time series

IT is a widely accepted view that Internet tra c and thus the related quantities show long-range dependence (LRD). Besides other features, in practice, this means slowly decaying correlations, often according to some power law: C(τ) ∼ τ−α. Recent results suggest that this phenomenon is valid only on certain time scales, depending on the actual measurement. Stationary periods were detected in va...

a time-series analysis of the demand for life insurance in iran

با توجه به تجزیه و تحلیل داده ها ما دریافتیم که سطح درامد و تعداد نمایندگیها باتقاضای بیمه عمر رابطه مستقیم دارند و نرخ بهره و بار تکفل با تقاضای بیمه عمر رابطه عکس دارند

A Test for Non-Stationarity of Time-Series