Modelling and Forecasting Australian Domestic Tourism
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1 Modelling and Forecasting Australian Domestic Tourism George Athanasopoulos & Rob Hyndman
2 Outline Background 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
3 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism
4 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism $55 billion - more than 3 times international arrivals (TFC 2005)
5 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism $55 billion - more than 3 times international arrivals (TFC 2005) Infrastructure maintenance
6 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism $55 billion - more than 3 times international arrivals (TFC 2005) Infrastructure maintenance
7 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism $55 billion - more than 3 times international arrivals (TFC 2005) Infrastructure maintenance My research - Research Fellow
8 Background Australian Tourism Industry: 1 International Arrivals 2 Outbound 3 Domestic Tourism $55 billion - more than 3 times international arrivals (TFC 2005) Infrastructure maintenance My research - Research Fellow Tourism Australia STCRC Monash University
9 Background Outline of presentation: 1 Data 2 Regression framework 3 Exponential smoothing 4 Exp smoothing + Exogenous variables 5 Forecasts 6 Conclusions and Further research
10 Outline Data 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
11 Data National Visitor Survey - Visitor Nights (1998Q1-2005:Q2)
12 Data National Visitor Survey - Visitor Nights (1998Q1-2005:Q2) Holiday VFR Business Other
13 Data Aggregate Data & TFC Forecasts: VN Sample TFC forecasts
14 Outline Regression models 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
15 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t )
16 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i)
17 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend
18 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita
19 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index
20 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita
21 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise
22 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise
23 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise MAR t, JUN t, SEP t - Seasonal dummies
24 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise MAR t, JUN t, SEP t - Seasonal dummies ε t - random error term
25 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise MAR t, JUN t, SEP t - Seasonal dummies ε t - random error term
26 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise MAR t, JUN t, SEP t - Seasonal dummies ε t - random error term Step 1: Run OLS and test for upto 1 lag of each variable.
27 Regression models Tourism demand function: VN i t = f (t, DEBT t, DPI t, GDP t, BALI t, OLYMP t, MAR t, JUN t, SEP t, ε t ) VN i t - ln(visitor nights per capita travelling for purpose i) t - exponential trend DEBT t - Growth rate of real personal debt per capita DPI t - Growth rate of domestic price index GDP t - Growth rate of real GDP per capita BALI t - 1 for 2002:Q4 and beyond, 0 otherwise OLYMP t - 1 for 2000:Q4, 0 otherwise MAR t, JUN t, SEP t - Seasonal dummies ε t - random error term Step 1: Run OLS and test for upto 1 lag of each variable. Step 2: Sequentially drop insignificant parameters and estimate efficiently using SUR.
28 Regression models Estimated demand system: Regressor Holiday VFR Business Other Intercept (13.33) (21.03) (22.84) (47.28) t (0.50) (0.88) D t (1.23) (2.00) P t (1.64) 7.58 (2.89) Y t (8.14) BALI t (17.75) OLYMP t (51.26) MAR t (13.06) (26.87) (24.28) (64.74) JUN t (12.40) (26.87) (24.51) (64.74) SEP t (14.01) (27.84) (25.57) (66.86) R R Significant at the 5% level.
29 Outline Exponential smoothing via innovations state space models 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
30 Exponential smoothing via innovations state space models Innovation state space models - ETS(A,-,A):
31 Exponential smoothing via innovations state space models Innovation state space models - ETS(A,-,A): No trend Additive trend Damped trend y t = l t 1 + s t m + ε t y t = l t 1 + b t 1 + s t m + ε t y t = l t 1 + b t 1 + s t m + ε t l t = l t 1 + αε t l t = l t 1 + b t 1 + αε t l t = l t 1 + b t 1 + αε t s t = s t m + γε t b t = b t 1 + βε t b t = φb t 1 + βε t s t = s t m + γε t s t = s t m + γε t ŷ n+h = l n + s n+h m ŷ n+h = l n + hb n + s n+h m ŷ n+h = l n + (1 + φ + + φ h 1 )b n +s n+h m where: 0 < α < 1, 0 < β < α, 0 < γ < 1, 0 < φ < 0.98.
32 Exponential smoothing via innovations state space models Innovation state space models - ETS(A,-,A): No trend Additive trend Damped trend y t = l t 1 + s t m + ε t y t = l t 1 + b t 1 + s t m + ε t y t = l t 1 + b t 1 + s t m + ε t l t = l t 1 + αε t l t = l t 1 + b t 1 + αε t l t = l t 1 + b t 1 + αε t s t = s t m + γε t b t = b t 1 + βε t b t = φb t 1 + βε t s t = s t m + γε t s t = s t m + γε t ŷ n+h = l n + s n+h m ŷ n+h = l n + hb n + s n+h m ŷ n+h = l n + (1 + φ + + φ h 1 )b n +s n+h m where: 0 < α < 1, 0 < β < α, 0 < γ < 1, 0 < φ < 0.98.
33 Outline Innovations state space models with exogenous variables 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
34 Innovations state space models with exogenous variables Innovation state space model including exogenous variables - ETSX(A,A D,N,X):
35 Innovations state space models with exogenous variables Innovation state space model including exogenous variables - ETSX(A,A D,N,X): Damped trend y t = l t 1 + b t 1 + x tδ + ε t
36 Innovations state space models with exogenous variables Innovation state space model including exogenous variables - ETSX(A,A D,N,X): Damped trend y t = l t 1 + b t 1 + x tδ + ε t l t = l t 1 + b t 1 + αε t b t = φb t 1 + βε t ŷ n+h = l n + (1 + φ + + φ h 1 )b n + ˆx n+hˆδ where: 0 < α < 1, 0 < β < α, 0 < γ < 1, 0 < φ < X = (DEBT, DPI, GDP, BALI, OLYMP, MAR, JUN, SEP)
37 Innovations state space models with exogenous variables Estimates of the ETSX models: Parameter Holiday VFR Business Other α β φ Variable D t P t Y t BALI t OLYMP t MAR t JUN t SEP t
38 Outline Forecasts 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
39 Forecasts Forecast comparisons:
40 Forecasts Forecast comparisons: Holdout sample: (2004:Q3-2005:Q2)
41 Forecasts Forecast comparisons: Holdout sample: (2004:Q3-2005:Q2) MAPE Regr ETS ETSX TFC Holiday VFR Business Other Total Average
42 Forecasts Forecast comparisons: Holdout sample: (2004:Q3-2005:Q2) MAPE Regr ETS ETSX TFC Holiday VFR Business Other Total Average
43 Forecasts Forecast comparisons: Holdout sample: (2004:Q3-2005:Q2) MAPE Regr ETS ETSX TFC Holiday VFR Business Other Total Average
44 Forecasts Forecast comparisons: Holdout sample: (2004:Q3-2005:Q2) MAPE Regr ETS ETSX TFC Holiday VFR Business Other Total Average
45 Forecasts Long term annual forecasts: Regr ETS ETSX TFC
46 Forecasts Long term annual forecasts for each component: PANEL A: Holiday PANEL B: VFR PANEL C: Business PANEL D: Other Regr ETS ETSX TFC
47 Outline Conclusions and future research 1 Background 2 Data 3 Regression models 4 Exponential smoothing via innovations state space models 5 Innovations state space models with exogenous variables 6 Forecasts 7 Conclusions and future research
48 Conclusions and future research Domestic tourism and existing forecasts:
49 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts
50 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic
51 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic Identified important economic relationships
52 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic Identified important economic relationships Future research:
53 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic Identified important economic relationships Future research: Further development of ETSX
54 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic Identified important economic relationships Future research: Further development of ETSX Comprehensive Monte Carlo examining the proposed two step procedure Construction of prediction intervals via theory or simulation Application to other data e.g. international arrivals
55 Conclusions and future research Domestic tourism and existing forecasts: Statistical models outperform TFC forecasts Existing long term forecasts over-optimistic Identified important economic relationships Future research: Further development of ETSX Comprehensive Monte Carlo examining the proposed two step procedure Construction of prediction intervals via theory or simulation Application to other data e.g. international arrivals Hierarchical forecasting - Australia, States, Regional
56 Conclusions and future research Thank you!!!
Modelling and forecasting Australian domestic tourism
* Title page with author details Modelling and forecasting Australian domestic tourism G. Athanasopoulos, R. J. Hyndman Department of Econometrics and Business Statistics, Monash University, Melbourne,
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