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Data and methodologyWecollected prices on 14 airfares on a daily basis for 79 days between November 24, 2005and February 10, 2006. Each of the nonstop roundtrip flights departed on February 11,2006 and arrived (return) on March 11, 2006. The flights were an assortment of USdomestic and international itineraries. The airlines included in the sample includeAmerican, Northwest, Delta, and Continental. The cities that were part of the trips,departure or arrival, were New York, New York; Detroit, Michigan; Los Angeles,California; Dallas/Fort Worth, Texas; Chicago, Illinois; San Jose, Costa Rica; London,England; Tokyo, Japan; San Jose, California; Amsterdam, the Netherlands; andMinneapolis-St Paul, Minnesota. Prices were in US$ gathered from the web site of theairlines at about the same time of day with the same traveller attributes, e.g. tourist,entered into the ticket request.The departure and arrival airports and takeoff and landing times as well as airlinesare shown in Table I. The collected prices for the flights, with the trip distance in miles,are presented in Table II. Here, each trip has its opening price 79 days prior to departure,average price across the 79 days prior to the flight departure, minimum price during the79-day observation period, and percentage volatility estimates on a daily annualizedbasis. Most airlines sell tickets approximately 330 days in advance of the flightdeparture. The observation period of 79 days is chosen as the benefits from advancepurchases mostly occur about two and one-half months prior to departure.We employed the logarithmic price change approach of Mun (2006) to calculate therelative price change,
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