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# What is STATIONARY DATA SERIES?

Stationarity is used as a tool in time series analysis, where the raw data are often transformed to become stationary; for example, economic data are often seasonal and/or dependent on a non-stationary price level.
http://en.wikipedia.org/wiki/Stationary_process
Stationarity A common assumption in many time series techniques is that the data are stationary. A stationary process has the property that the mean, variance and autocorrelation structure do not change over time.
http://www.itl.nist.gov/div898/handbook/pmc/section4/pmc442.htm
Time series data are very common in empirical economic studies. Figure 1 plots some frequently used variables. The upper left ﬁgure plots the quarterly GDP from 1947 to 2001; the upper right ... In other words, a stationary time series {X t} ...
http://www.econ.ohio-state.edu/dejong/note1.pdf
k. Non stationary time series. Most economic (and also many other) time series do not satisfy the stationarity conditions stated earlier for which ARMA models have been derived.
http://www.xycoon.com/non_stationary_time_series.htm
Statistical stationarity: A stationary time series is one whose statistical properties such as mean, variance, ... For this reason you should be cautious about trying to extrapolate regression models fitted to nonstationary data.
http://people.duke.edu/~rnau/411diff.htm
In the statistical analysis of time series, a stochastic process is trend stationary if an underlying trend (function solely of time) can be removed, leaving a stationary process. Contents. ... then the residuals are referred to as the detrended data, and the original series ...
http://en.wikipedia.org/wiki/Trend_stationary
The purpose of using formal time series analysis methods on sequential data is to learn "something" about the nature of the system generating the data. ... because if the data is stationary then many simplifying assumptions can be made.
http://etclab.mie.utoronto.ca/people/moman/Stationarity/stationarity.html
The CDFs should be the same if the series is stationary. Since the CDFs will never be exactly the same you can apply Pearson's $\chi^{2}$ test comparing the value of the CDFs through several waypoints. ... How random are financial data series? 2.
http://quant.stackexchange.com/questions/2372/how-to-check-if-a-timeseries-is-stationary
Enter your data Row-wise starting from the left-upper corner, and then click the Calculate button for the test conclusion. Blank boxes are not included in the calculations but zeros are.
Econometric Discussions ... "Hi, my study involves measuring the price elasticity, and income elasticity of ..." · "any ideas? cheers" ... "Ok so i've run the ADF test on all ...
http://forums.eviews.com/viewtopic.php?f=18&t=1791
Examples of Stationary Time Series Overview 1. Stationarity 2. Linear processes 3. Cyclic models 4. Nonlinear models Stationarity ... observed data. What operations produce a stationary process? Can we recognize/identify these in data? Statistics 910, #2 2
http://www-stat.wharton.upenn.edu/~stine/stat910/lectures/02_stationarity.pdf
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http://stats.stackexchange.com/questions/2077/how-to-make-a-time-series-stationary
Any stationary time series can be represented with an ARMA model: Application. Plot and ARMA(1,1) and an AR(1) model with rho=0.7 and theta=0.4, and look at the AC and PAC functions. Prog: ARMA.prg. File: USUK, page 2. ... Series: US PPI . Plot the data:
http://userhome.brooklyn.cuny.edu/economics/muctum/EconometricsG/Stationary%20Time%20Series.doc
When a data series is not stationary, one of the key ways to remove the nonstationarity is through differencing. The concept behind differencing is not unlike the other methods we’ve used in past discussions on forecasting: ...
http://analysights.wordpress.com/2011/01/13/forecast-friday-topic-stationarity-in-time-series-data/
Chapter 11 Stationary and non-stationary time series G. P. Nason Time series analysis is about the study of data collected through time. The ﬁeld of time series is a vast one that pervades many areas of science and
http://www.cas.usf.edu/~cconnor/geolsoc/html/chapter11.pdf
If a series is non-stationary in the mean then there are two distinctly different ways to approach this problem. The actual data will tell you which is the best remedy.
http://stats.stackexchange.com/questions/31201/arima-modeling-with-non-stationary-daily-data-at-what-lag-do-i-difference-the-s
Please (!) go read a book on basic time series analysis instead of just posting a question each time you see a new word. Michael On Thu, Mar 22, 2012 at 4:56 AM, sagarnikam123 <[hidden email]> wrote:
http://r.789695.n4.nabble.com/how-to-make-this-time-series-data-stationary-td4494907.html
Time series data occur naturally in many application areas. • economics - e.g., monthly data for unemployment, hospital admissions, etc. • ﬁnance - e.g., daily exchange rate, a share price, etc. ... It is a second order stationary series with ...
http://www.statslab.cam.ac.uk/~rrw1/timeseries/t.pdf
Time series data: A set of observations on the values that a variable takes at different times. Cross-sectional data: Data of one or more variables, ... Differencing: Used to make the series stationary, to De-trend, and to control the auto-correlations.
Stochastic time series - Data are only partly determined by past values and future values have to be described with a probability distribution. This is the case for most, if not all, natural time series. ... A Note on Non-Stationary Data.
http://userwww.sfsu.edu/efc/classes/biol710/timeseries/TimeSeriesAnalysis.html
Multivariate time series (MTS) data sets are common in various multimedia, medical and ﬁnancial application do-mains. ... the MTS data is stationary or not, i.e., whether the corre-lation is stable or not. Subsequently, for a non-stationary
http://infolab.usc.edu/DocsDemos/icdm05.pdf
Estimationandinference withnon-stationary paneltime-series data. Ron P. Smith Department of Economics, Birkbeck College, London email: R.Smith@bbk.ac.uk
http://carecon.org.uk/UWEMasters/Applied%20Econometrics/panel1.pdf
To make this series stationary, ... 10/18/05 Stat 170-Intro Time series/Sanchez 17 5.3 Homework question • Make the data set airlines stationary. To guide yourself, use the handout we use in this lecture (handed ...
http://www.docstoc.com/docs/21200397/Making-a-time-series-stationary
In the following topics, we will first review techniques used to identify patterns in time series data ... The other reason for removing seasonal dependencies is to make the series stationary which is necessary for ARIMA and other techniques. To index: ARIMA. General Introduction; Two Common ...
http://www.statsoft.com/textbook/time-series-analysis/
Time series analysis, which first came to fore with the publication of Norbert Wiener's seminal text Extrapolation, Interpolation, and Smoothing of Stationary Time Series with Engineering Applications (2) in 1949, has proved invaluable in many fields of data analysis.
http://financial-dictionary.thefreedictionary.com/Stationary+time+series
Statistics 626 ' & \$ % 8 Covariance Stationary Time Series So far in the course we have looked at what we have been calling time series data sets. We need to make a series of assumptions about our
http://www.stat.tamu.edu/~jnewton/stat626/topics/topics/topic8.pdf
Since most of the economic time series data are non-stationary, a method called differencing is employed to convert non-stationary data into stationary. The differenced series is regressed on to the original ...
http://sixsigma.scmhrd.edu/articles/Forecasting%20Economic%20Series%20using%20ARMA.pdf
Time series plots of stationary variables should have a well-defined mean and a relatively constant variance (i.e., no heteroscedasticity). ... Fitting a regression model to differenced and/or lagged data: 1.
http://people.duke.edu/~rnau/timereg.html
What are the advantages of an electronic spreadsheet over a paper spreadsheet? Answer it! Related articles: Staying Current: How to Update Windows on Your PC; Relevant answers ... What is the definition for multiple data series in Excel? ametym a
A Stationary Series is a Variable with constant Mean across time A Stationary Series is a Variable ... Caveats in Using Time Series Data in Applied Econometric Modeling Data Should be Stationary Presence of Autocorrelation Guard Against Spurious Regressions Establish Cointegration ...
http://www.emu.edu.tr/mferidun/1%20TSE.ppt
How can we transform the time series data from non-stationary to stationary? For data with deterministic trend, we can use either Trend-Stationary Process (TSP) or Difference-Stationary Process (DSP). For data with stochastic trend ...
http://www.hkbu.edu.hk/~billhung/econ3600/application/app01/app01.html
statistical glossary - time series data ... Time Series. A time series is a sequence of observations which are ordered in time (or space).
http://www.stats.gla.ac.uk/steps/glossary/time_series.html
A times series is a set of data ordered in time, usually recorded at regular time intervals. In probability theory, a time series {x} is a collection of random variables indexed by time. In the social sciences, examples of time
http://what-when-how.com/social-sciences/stationary-process-social-science/
Best Answer: A stationary series has a valid mean because the data converges to a point, on average, the population mean. A non-stationary series has no mean at all. Although ...
Regression on non-stationary data can result in misleading -the so called 'spurious'- values of R^2, DW, t and F statistics. ... The series of first differences or percent changes reverts back to the first moment (the mean).
You may also find the following paper on unofficial economy useful: Regulatory Discretion and the Unofficial Economy Dataset. How do you aggregate your data? ... Time-series data for poverty are difficult to estimate, and do not exist for the last 20 years.
A non-stationary time series model using a likelihood function as a function of input data, base demand parameters, and time dependent parameter. The likelihood function may represent any statistical
http://www.freepatentsonline.com/7580852.html
2. identifying models based on the data (observed series) ... Suppose that a stationary series z t with mean zero is known to be autoregressive. The autocorrelation function of an AR(p) is found by taking expectations of and dividing through by the variance of z t
http://isc.temple.edu/economics/notes/timeseries/Timeseri.HTM
(i.e. estimating tax revenues) Stationarity If a time series is stationary it means that the data fluctuates about a mean or constant level. Many time series models assume equilibrium processes. Non-Stationarity Non-stationary data does not fluctuate about a mean. It may ...
http://www.polsci.wvu.edu/duval/PS491a/Notes/TimeSeries.ppt
think of time series data in the context of political dynamics. Instead of mechanistically worrying about the ... it is called a ﬁrst-order non-stationary series or an integrated series of order one i.e. I(1). It is an I(1) series
https://files.nyu.edu/mrg217/public/timeseries.pdf
602 Methods for Stationary Time-Series Data 13.17 The ﬁle hstarts.data contains the housing starts data graphed in Figure 13.2. For the period 1966:1 to 2001:4, regress the unadjusted series ht on a constant,
http://qed.econ.queensu.ca/ETM/corrections/Fourth-pdf/pg602.pdf
Here it is assumed that the time series and are stationary time series. For example is (weakly) stationary. if ... the data is stationary and doesn’t need to be differenced) When the time series is . flat and potentially slow-turning around a.
http://faculty.smu.edu/tfomby/eco6375/data/TIME%20SERIES%20REGRESSION%20NOTES.doc
Hi, Is it correct to use Granger Causality Tests on non-stationary, i(1), time-series ... Dear sir, I also had the same problem. Hopefully, I got something which can be ...
stationarity, time series data, various unit root tests, spurious regression, the R-squared ... 5 The stationary data were obtained after making simple differences, and the stationarity was tested using Phillips – Perron test (PP test henceforth), see Table 3.
http://mpra.ub.uni-muenchen.de/27926/1/MPRA_paper_27926.pdf
how to check stationary/non-stationary time series data?. i have following file 1A2X_B_phi_psi_pot_r_k.txt but i don't know which test used to check non-stationary ness of time series?
http://r.789695.n4.nabble.com/how-to-check-stationary-non-stationary-time-series-data-td4495257.html
Time Series Data Library - ... The Time Series Data Library is now hosted on DataMarket.com. For more information, see this announcement.
http://robjhyndman.com/TSDL/
How do I use differencing to obtain a stationary time series? An Excel sheet with both the data and results can be downloaded by clicking here.
http://www.kovcomp.co.uk/support/XL-Tut/demo-desc.html
Adaptive Normalization: A Novel Data Normalization Approach for Non-Stationary Time Series Eduardo Ogasawara, Leonardo C. Martinez, Daniel de Oliveira,
http://homepages.dcc.ufmg.br/~glpappa/papers/Ogasawaraetal-2010-IJCNN.pdf
stationary in monthly data. Intuitively this means for example, that the time series between January to ... Many stationary series are also called covariance stationary, wide-sense stationary, or second order stationary in the literature.
http://www.fordham.edu/economics/vinod/et2le2.pdf
Non-stationary series: If a time series contains a trend, ... (in monthly data) lags, the series is not stationary; it must be differenced with a gap approximately equal to the seasonal interval before further modeling.
http://home.ubalt.edu/ntsbarsh/stat-data/Forecast.htm

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