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1 Package MARX April 24, 2018 Title Simulation, Estimation, Model Selection and Forecasting for MARX Models Version 0.2 Date Author [aut, cre, cph], Alain Hecq [ctb], Lenard Lieb [ctb] Maintainer Simulate, estimate (b t-mle), select and forecast mied causal-noncausal autoregressive models with possibl eogenous regressors, using methods proposed in Lanne and Saikkonen (2011) <doi: / > and Hecq et al. (2016) <doi: /annaeconstat >. Imports matlab, fbasics, tseries, stabledist, metrolog License GPL-2 Encoding UTF-8 LazData true RogenNote NeedsCompilation no Repositor CRAN Date/Publication :44:32 UTC R topics documented: aic ar.ls bic commodit companion.form compute.ma forecast.mar hq

2 2 aic inference ll.ma mar mar.t mied pseudo regressor.matri selection.lag selection.lag.lead sim.mar Inde 18 aic The Akaike information criterion (AIC) function This function allows ou to calculate the Akaike information criteria (AIC) for ARX models. aic(,, p_ma) p_ma Matri of data (ever column represents one time series). Specif NULL or Maimum number of autoregressive terms to be included. p values Lag order chosen b AIC. Vector containing values AIC for p = 0 up to p_ma. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) aic(data$, data$,8)

3 ar.ls 3 ar.ls The ARX estimation b OLS function This function allows ou to estimate ARX models b ordinar least squares (OLS). ar.ls(,, p) p Matri of data (ever column represents one time series). Specif NULL or Number of autoregressive terms to be included. coefficients coef.auto coef.eo mse residuals loglikelihood fitted.values df vcov Vector of estimated coefficients. Vector of estimated autoregressive parameters. Vector of estimated eogenous parameters. Mean squared error. Residuals. of the loglikelihood. Fitted values. Degrees of freedom. Variance-covariance matri of residuals. data <- sim.mar(c('t',3,1),c('t',1,1),100,0.5,0.4,0.3) ar.ls(data$,data$,2)

4 4 commodit bic The Baesian/Schwarz information criterion (BIC) function This function allows ou to calculate the Baesian/Schwarz information criteria (BIC) for ARX models. bic(,, p_ma) p_ma Matri of data (ever column represents one time series). Specif NULL or Maimum number of autoregressive terms to be included. p values Lag order chosen b BIC. Vector containing values BIc for p = 0 up to p_ma. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) bic(data$, data$,8) commodit Data: Monthl growth rates of commodit prices, echange rate and industrial production inde. Monthl growth rates of commodit prices, echange rate and industrial production inde from Februar 1980 until October Levels of these series can be downloaded from IMF and Federal Reserve Bank of St. Louis. data("commodit")

5 companion.form 5 Format Source A data frame with 441 observations on the following 8 variables. X_date_ a vector with dates dlnbev a numeric vector dlnind a numeric vector dlnrawm a numeric vector dlnmeta a numeric vector dlnoil a numeric vector dlnipi a numeric vector dlne a numeric vector IMF Primar Commodit Prices ( and Federal Reserve Bank of St. Louis ( data(dataset) companion.form Companion form function This function allows ou to compute a companion form matri in order to check the stabilit of causal and noncausal part of the ARX model. companion.form(pol) pol Coefficient vector. If polnomial is 1 - a - b^2, coefficient vector is c(a, b). C Companion matri C.

6 6 forecast.mar pol <- c(0.3,0.4) C <- companion.form(pol) compute.ma Coefficients of the moving average representation function This function allows ou to invert a polnomial (either the causal or the noncausal one) and output the corresponding coefficients of the moving average representation. compute.ma(pol, M) pol M Coefficient vector. If polnomial is 1 - a - b^2, coefficient vector is c(a, b). Truncation value M (how man MA coefficients should be computed?). psi Vector containing coefficients of the moving average representation. pol <- c(0.3,0.4) psi <- companion.form(pol) forecast.mar Forecasting function for the MARX model This function allows ou to forecast with the mied causal-noncausal model with possibl eogenous regressors. forecast.mar(, X, p_c, p_nc, X.for, h, M, N)

7 hq 7 Data vector. X p_c p_nc X.for (optional) Matri with data (column represent a series). Number of lags (causal order). Number of leads (noncausal order). h Forecast horizon h. (optional) Matri with forecasted values for X (column represents series). M (optional) Truncation value M for MA representation. Default value: 50. N (optional) Number of simulations to forecast noncausal component. Default: 10,000..for Vector containing forecasted values for. ## Forecasting MAR(0,1) model 4-periods ahead for lnbev (from dataset) data <- MARX::dataset[,2].for <- forecast.mar(=data, p_c=0, p_nc=1, h=4, M=50, N=1000) hq The Hannan-Quinn (HQ) information criterion function This function allows ou to calculate the Hannan-Quinn (HQ) information criteria for ARX models. hq(,, p_ma) p_ma Matri of data (ever column represents one time series). Specif NULL or Maimum number of autoregressive terms to be included.

8 8 inference p values Lag order chosen b HQ. Vector containing values HQ for p = 0 up to p_ma. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) hq(data$, data$,8) inference Asmptotic inference for the MARX function This function allows ou to calculate standard errors and confidence intervals for parameters of the MARX model. inference(,, B_C, B_NC, B_, IC, sig, df, sig_level) B_C B_NC B_ IC sig df sig_level Matri of data (ever column represents one time series). Specif NULL or Estimated causal parameters of the MARX. Estimated noncausal parameters of the MARX. Estimated parameters of the eogenous variables in the MARX. Estimated intercept. Estimated scale parameter of the assumed underling Student-t distribution of the residuals. Estimated degrees of freedom of the assumed underling Student-t distribution of the residuals. Significance level for the construction of inference.

9 ll.ma 9 CI.c CI.nc CI.eo CI.int se.c se.nc se.eo se.int Confidence intervals for causal parameters. Confidence intervals for noncausal parameters. Confidence intervals for eogenous parameters. Confidence interval for intercept. Standard errors of causal parameters. Standard errors of noncausal parameters. Standard errors of eogenous parameters. Standard error of intercept. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) <- data$ <- data$ res <- mar.t(,,1,1) inference(,,res$coef.c,res$coef.nc,res$coef.eo,res$coef.int,res$scale,res$df,0.05) ll.ma The value of the t-log-likelihood for MARX function This function allows ou to determine the value of the t-log-likelihood for the MARX model. ll.ma(params,,, p_c, p_nc) params p_c p_nc List of parameters. Matri of data (ever column represents one time series). Specif NULL or Number of lags. Number of leads.

10 10 mar neg.loglikelihood Minus the loglikelihood. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) <- data$ <- data$ p_c <- 1 p_nc <- 1 params <- c(0.5,0.4,0.3,0,1,1) ll.ma(params,,,p_c,p_nc) mar The MARX function This interface-based function allows ou to perform model selection for MARX models based on information criteria. mar(,, p_ma, sig_level, p_c, p_nc) p_ma sig_level p_c p_nc Matri of data (ever column represents one time series). Specif NULL or Maimum number of autoregressive parameters (leads + lags) to be included. Significance level for the construction of inference. Number of lags (if not specified b the user a model selection procedure is used to determine the number of lags). Number of leads (if not specified b the user a model selection procedure is used to determine the number of leads). Details Mied causal-noncausal autoregressions with eogenous regressors.

11 mar.t 11 The function returns the values of the information criteria for the pseudo-causal models. The user is asked to choose a value for "p". Etensive output for the MARX(r,s,q) model (with p = r + s) which maimizes the log-likelihood is reported. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) p_ma <- 8 sig_level < mar(data$, data$, p_ma, sig_level,1,1) ## p_c and p_nc chosen to be 1: MARX(1,1,1) output. mar(data$, NULL, p_ma,sig_level,1,1) ## MAR(1,1), no eogenous variable specified. mar.t The estimation of the MARX model b t-mle function This function allows ou to estimate the MARX model b t-mle. mar.t(,, p_c, p_nc, params0) p_c p_nc params0 Matri of data (ever column represents one time series). Specif NULL or Number of lags. Number of leads. Starting values for the parameters to be estimated (both model and distributional parameters). coef.c coef.nc coef.eo coef.int scale Estimated causal coefficients. Estimated noncausal coefficients. Estimated eogenous coefficients. Estimated intercept. Estimated scale parameter.

12 12 mied df residuals se.dist Estimated degrees of freedom. Residuals. Standard errors of the distributional parameters. data <- sim.mar(c('t',3,1),c('t',3,1),100,0.5,0.4,0.3) mar.t(data$,data$,1,1) mied The MARX estimation function This function allows ou to estimate mied causal-noncausal MARX models b t-mle (compatible with most functions in lm() class). mied(,, p_c, p_nc) ## Default S3 method: mied(,, p_c, p_nc) ## S3 method for class 'mied' print(,...) ## S3 method for class 'mied' summar(object,...) p_c p_nc Matri of data (ever column represents one time series). Specif NULL or Number of lags to be included. Number of leads to be included.... Other parameters. object An object of the class "mied".

13 pseudo 13 An object of class "mied" is a list containing the following components: coefficients se df.residual residuals fitted.values order Vector of estimated coefficients. Standard errors of estimated coefficients. Degrees of freedom residuals. Residuals. Fitted values. Vector containing (r,s,q), i.e. causal order r, noncausal order s, number of eogenous regressors q. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) object <- mied(data$, data$, 1, 1) class(object) <- "mied" summar(object) pseudo The pseudo-causal model function This function allows ou to estimate pseudo-causal ARX models b OLS (compatible with most functions in lm() class). pseudo(,, p) ## Default S3 method: pseudo(,, p) ## S3 method for class 'pseudo' print(,...) ## S3 method for class 'pseudo' summar(object,...) p Matri of data (ever column represents one time series). Specif NULL or Number of lags to be included.... Other arguments object An object of the class "pseudo"

14 14 regressor.matri An object of class "pseudo" is a list containing the following components: coefficients coef.auto coef.eo mse residuals loglikelihood fitted.values df vcov Vector of estimated coefficients. Vector of estimated autoregressive parameters. Vector of estimated eogenous parameters. Mean squared error. Residuals. of the loglikelihood. Fitted values. Degrees of freedom. Variance-covariance matri of residuals. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) object <- pseudo(data$, data$, 2) class(object) <- "pseudo" summar(object) regressor.matri The regressor matri function This function allows ou to create a regressor matri. regressor.matri(,, p) p Matri of data (ever column represents one time series). Specif NULL or Number of autoregressive terms to be included. Z Regressor matri

15 selection.lag 15 data <- sim.mar(c('t',3,1),c('t',1,1),100,0.5,0.4,0.3) regressor.matri(data$, data$, 2) selection.lag The model selection for pseudo-arx function This function allows ou to calculate AIC, BIC, HQ for pseudo-arx models. selection.lag(,, p_ma) p_ma Matri of data (ever column represents one time series). Specif NULL or Maimum number of autoregressive terms to be included. bic aic hq Vector containing values BIC for p=0 up to p_ma. Vector containing values AIC for p=0 up to p_ma. vector containing values HQ for p=0 up to p_ma. data <- sim.mar(c('t',1,1), c('t',1,1),100,0.5,0.4,0.3) selection.lag(data$,data$,8)

16 16 sim.mar selection.lag.lead The lag-lead model selection for MARX function This function allows ou to determine the MARX model (for p = r + s) that maimizes the t-loglikelihood. selection.lag.lead(,, p_pseudo) p_pseudo Matri of data (ever column represents one time series). Specif NULL or Number of autoregressive terms to be included in the pseudo-causal model. p.c p.nc The number of lags selected. The number of leads selected. loglikelihood The value of the loglikelihood for all models with p = r + s. data <- sim.mar(c('t',3,1), c('t',3,1),100,0.5,0.4,0.3) selection.lag.lead(data$,data$,2) sim.mar The simulation of MARX processes This function allows ou to simulate MARX processes based on different underling distribution. sim.mar(dist.eps, dist., obs, c_par, nc_par, eo_par)

17 sim.mar 17 dist.eps dist. obs c_par nc_par eo_par vector containing the error distribution and its parameters (options: t, normal, stable). vector containing the distribution of and its parameters (options: t, normal, stable). Specif NULL or Number of observations for simulated process. vector of causal parameters. vector of noncausal parameters. Parameter of the eogenous variable. Simulated data. Simulated data (eogenous variable). dist.eps <- c('t',1,1) ## t-distributed errors with 1 degree of freedom and scale parameter 1 dist. <- c('normal',0,1) ## standard normall distributed variable obs <- 100 c_par <- c(0.2,0.4) nc_par <- 0.8 eo_par <- 0.5 sim.mar(dist.eps,dist.,obs,c_par,nc_par,eo_par) ## Simulates a MARX(2,1,1) process

18 Inde Topic causal-noncausal inference, 8 mar.t, 11 mied, 12 selection.lag.lead, 16 Topic datasets commodit, 4 Topic estimation ar.ls, 3 mar, 10 mar.t, 11 mied, 12 pseudo, 13 regressor.matri, 14 Topic forecasting forecast.mar, 6 Topic inference inference, 8 Topic optimization ll.ma, 9 Topic pseudo-causal ar.ls, 3 pseudo, 13 selection.lag, 15 Topic selection aic, 2 bic, 4 hq, 7 mar, 10 selection.lag, 15 selection.lag.lead, 16 Topic simulation sim.mar, 16 Topic stabilit, companion.form, 5 compute.ma, 6 Topic stationarit companion.form, 5 compute.ma, 6 aic, 2 ar.ls, 3 bic, 4 commodit, 4 companion.form, 5 compute.ma, 6 dataset (commodit), 4 forecast.mar, 6 hq, 7 inference, 8 ll.ma, 9 mar, 10 mar.t, 11 mied, 12 print.mied (mied), 12 print.pseudo (pseudo), 13 pseudo, 13 regressor.matri, 14 selection.lag, 15 selection.lag.lead, 16 sim.mar, 16 summar.mied (mied), 12 summar.pseudo (pseudo), 13 18

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