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A fuzzy time series forecasting model-DDD was proposed based on difference and deifference in difference in paper. Prportion of tourism revenue in tertiary industry during 2005-2015 in Hainan province. Results of DDD would provide useful help for the development and planning of tourism in some departments in Hainan province. In addition, a new model proposed was a beneficial supplement for the solving of time series forecasting.

Analysis of Proportion of Possession of Tourism Income in Tertiary Industry in Hainan Province based on DDD