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Treatment of Seasonal Products and CPI Volatility


  • Oguz Atuk
  • M. Utku Ozmen
  • Orhun Sevinc


In this study, we first discuss the issues of treatment of seasonal items in consumer price indices (CPI), strong seasonality and unpredictable volatility. Later we examine the effect of selected seasonal treatment methods on the volatility of Laspeyres-type CPI for the first time using a unique data set of fresh fruits and vegetables prices from 2007 to 2011. Based on combination of treatment methods we calculate 720 different fresh fruits and vegetables price indices. Results suggest that using 2 or 3 month price averages reduces the monthly volatility of strongly seasonal products by 15 and 23 percent, respectively, in comparison to using one month averages. Also, using fixed weights yields 18 percent lower volatility than using variable weights. The other categories of base price selection, imputation of missing prices and treatment of extreme prices/trimming have mixed yet minor effects on volatility.

Suggested Citation

  • Oguz Atuk & M. Utku Ozmen & Orhun Sevinc, 2013. "Treatment of Seasonal Products and CPI Volatility," Central Bank Review, Research and Monetary Policy Department, Central Bank of the Republic of Turkey, vol. 13(1), pages 51-82.
  • Handle: RePEc:tcb:cebare:v:13:y:2013:i:1:p:51-82

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    References listed on IDEAS

    1. Yusuf Soner Baskaya & Tugrul Gurgur & Fethi Ogunc, 2008. "Kuresel Isinma, Kuresellesme ve Gida Krizi - Turkiye'de Islenmis Gida Fiyatlari Uzerine Ampirik Bir Calisma," Central Bank Review, Research and Monetary Policy Department, Central Bank of the Republic of Turkey, vol. 8(2), pages 1-32.
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    Cited by:

    1. Oguz Atuk & M. Utku Ozmen & Orhun Sevinc, 2012. "Mevsimlik Urunler ve Fiyat Oynakligi : Guclu Mevsimsellik ve Ongorulemeyen Oynaklik," CBT Research Notes in Economics 1216, Research and Monetary Policy Department, Central Bank of the Republic of Turkey.
    2. repec:asi:ajemod:2018:p:8-20 is not listed on IDEAS

    More about this item


    Consumer Price Index; Inflation; Strong seasonality; Volatility;

    JEL classification:

    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation


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