This is certainly a time series. We can see very strong patterns in the correlation matrix. This comes out in this form...
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1 Gas Price regression... This is based on data file GasolineMarket.mpj. Here is a schematic of the data file: Year Expenditure Population GasPrice Income NewCars UsedCars Public Trans Durables Nondurables Services This is certainly a time series. We can see very strong patterns in the correlation matrix. This comes out in this form... Correlations: Expenditure, Population, GasPrice, Income, NewCars,... Expenditure Population GasPrice Income Population.9 GasPrice Income NewCars UsedCars PublicTrans Durables Nondurables Services NewCars UsedCars PublicTrans Durables UsedCars.994 PublicTrans Durables Nondurables Services Nondurables Services.994 Cell Contents: Pearson correlation
2 It looks nicer if we re-organize the layout: Expend- Gas New Used Public Noniture Popn Price Income Cars Cars Trans Durables durables Population.9 GasPrice Income NewCars UsedCars PublicTrans Durables Nondurables Services The problem is that everything is moving forward in time together. So what explains GasPrice? Let s try the run on just NewCars, UsedCars, Population. Regression Analysis: GasPrice versus NewCars, UsedCars, Population The regression equation is GasPrice = NewCars -.42 UsedCars Population Predictor Coef SE Coef T P VIF Constant NewCars UsedCars Population S =.223 R-Sq = 89.7% R-Sq(adj) = 89.% Analysis of Variance Source DF SS MS F P Regression Error Total Source DF Seq SS NewCars UsedCars 226 Population 768 Unusual Observations Obs NewCars GasPrice Fit SE Fit St Resid R R R R R R denotes an observation with a large standardized residual. Durbin-Watson statistic =.4399 With no critical thought, this looks great! 2
3 But... here are facts about the residuals. This was obtained through Stat Regression Regression Graphs Four in one. Plots for GasPrice Year 99 Normal Probability Plot Versus Fits Percent Fitted Value Histogram Versus Order Frequency Observation Order 4 4 The plot in sequence order is a clear indication that the residuals have some type of time-based dependence. Moreover, the Durbin-Watson statistic is very small. As a side note, we ll record the residuals and then get the autocorrelation function plot. You ll get the residuals through Stat Regression Regression Storage s. You can get the autocorrelation function of the residuals through Stat Time Series Autocorrelation. 3
4 Here s what that plot looks like: Autocorrelation Autocorrelation Function for RESI (with % significance limits for the autocorrelations) Lag And here are the autocorrelations: Lag ACF T LBQ This is a common situation. We note that the first autocorrelation is large (.7) and statistically significant. The T is an ordinary t statistic. Values bigger than 2 or less than -2 indicate statistical significance. The LBQ refers to the Ljung-Box Q statistic to test the null hypothesis that the autocorrelations for all lags up to lag k are all equal to zero. If you really wish to do that test, you get information from Minitab s Help. So... there is a problem that has to be corrected. 4
5 Correction Attempt. Use time itself as a predictor. Regression Analysis: GasPrice versus NewCars, UsedCars,... The regression equation is GasPrice = NewCars -.38 UsedCars -.7 Population +. Year Predictor Coef SE Coef T P VIF Constant NewCars UsedCars Population Year S =.28 R-Sq = 89.8% R-Sq(adj) = 88.9% Analysis of Variance Source DF SS MS F P Regression Error Total Source DF Seq SS NewCars UsedCars 226 Population 768 Year 39 Unusual Observations Obs NewCars GasPrice Fit SE Fit St Resid R R R R denotes an observation with a large standardized residual. Durbin-Watson statistic =.4668 This has failed. The Durbin-Watson statistic is very small. Plots involving the residuals are bad also, but they are not shown here. Correction Attempt 2: Use the differenced data. The dependent variable and all the independent variables should be differenced. In Minitab, use Stat Time Series Differences. This will reduce the sample size by.
6 The plots look much better. Plots for GasPriceDiff 99 Normal Probability Plot 2 Versus Fits Percent Fitted Value Histogram 2 Versus Order Frequency Observation Order 4 4 The Durbin-Watson statistic is.46699, which is at the low end of borderline values. Correction attempt 3: Use the lagged version of the dependent variable. In Minitab, use Stat Time Series Lag. by. Again, this will drop the sample size Regression Analysis: GasPrice versus NewCars, UsedCars,... The regression equation is GasPrice = NewCars -.43 UsedCars +.27 Population +.89 GasPriceLag cases used, cases contain missing values Predictor Coef SE Coef T P VIF Constant NewCars UsedCars Population GasPriceLag S = R-Sq = 96.3% R-Sq(adj) = 96.% 6
7 Analysis of Variance Source DF SS MS F P Regression Error Total 4724 Source DF Seq SS NewCars 422 UsedCars 28 Population 82 GasPriceLag 329 Unusual Observations Obs NewCars GasPrice Fit SE Fit St Resid R R R R R denotes an observation with a large standardized residual. Durbin-Watson statistic =.6793 This is not perfect either, but the Durbin-Watson statistic has crossed, just barely, into the zone at which we can accept ρ =. Here are the relevant plots: Plots for GasPrice 99 Normal Probability Plot 2 Versus Fits Percent Fitted Value 2 Histogram 2 Versus Order Frequency Observation Order 4 4 This is tough to live with, but we could do it. 7
8 Note that the coefficient on GasPriceLag is.89, close to. The fitted equation was GasPrice = NewCars -.43 UsedCars +.27 Population +.89 GasPriceLag This can be rearranged as GasPrice -.89 GasPriceLag = NewCars -.43 UsedCars +.27 Population -.89 GasPriceLag The left side is almost the same as GasPriceDiff. An objection to using the lagged variable on the right side of the equation is that we are mixing up dependent and independent variables. Correction Attempt 4: Use the Cochrane-Orcutt method. There are several variations on this method. The essence of the concept is estimating the * autocorrelation coefficient ρ and then computing Y i = Y ˆ i ρ Yi and doing the same thing for each independent variable. There are several ways to get ˆρ. Start with the initial regression, which is where we were on pages -3. In the printout from the autocorrelation, we found that the first autocorrelation was computed as.7287, and we can call this ˆρ. Some like to use ˆρ = DW ; here 2 this is.4399 = These are not all that far apart. Let s use ˆρ =.7. In Minitab, we will need to create the lagged variable, and then use Calc Calculator to perform (original).7 (lagged). 8
9 Here are the results: Regression Analysis: GasPriceAdj versus NewCarAdj, UsedCarAdj, PopnAdj The regression equation is GasPriceAdj = NewCarAdj -.76 UsedCarAdj +.2 PopnAdj cases used, cases contain missing values Predictor Coef SE Coef T P VIF Constant NewCarAdj UsedCarAdj PopnAdj S = R-Sq = 7.7% R-Sq(adj) = 69.9% Analysis of Variance Source DF SS MS F P Regression Error Total 677. Source DF Seq SS NewCarAdj UsedCarAdj PopnAdj 32.8 Unusual Observations Obs NewCarAdj GasPriceAdj Fit SE Fit St Resid R R R RX R denotes an observation with a large standardized residual. X denotes an observation whose X value gives it large leverage. Durbin-Watson statistic = This has actually made the Durbin-Watson statistic a little worse (lower). 9
10 Here are the plots: Plots for GasPriceAdj 99 Normal Probability Plot 2 Versus Fits Percent Fitted Value Histogram 2 Versus Order Frequency Observation Order 4 4 This particular data set may have incurable issues. The series are all very smooth for the first (about) twenty years and then become irregular. The statistical word for this problem is non-stationarity. By the way, the most commonly used correction is differencing, the second method illustrated here. It s simple and easy to understand. Using time as a predictor, the first method done here, seems promising, but it rarely works.
This is certainly a time series. We can see very strong patterns in the correlation matrix. This comes out in this form...
Gas Price regression... This is based on data file GasolineMarket.mpj. This is certainly a time series. We can see very strong patterns in the correlation matrix. This comes out in this form... Correlations:
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