Tavuklar, Yumurtalar ve Replikasyon

Öz

Thurman ve Fisher (1988), yıllık ABD verilerinde yumurta üretiminin tavuk stoklarını Granger anlamında öngördüğünü, tavuk stoklarının ise yumurta üretimini öngörmediğini bildirir. Bu makale, yazarların 1930-1983 serilerini USDA Agricultural Statistics yıllıklarından yeniden kurar, her aday serinin arkasındaki yayın vintajlarını kaydeder, 66 olası vintaj yolunu yayımlanan tabloyla karşılaştırır ve seçilen seriyi 2025’e kadar uzatır. En yakın yeniden kurulum özgün yönü korur. Yumurta üretimi sonraki tavuk stoklarını öngörürken, tavuk stokları sonraki yumurta üretimini öngörmez. 1930-1983 dönemi log-büyüme tahminleri bu yönü korur. Birleştirilmiş 1930-2025 ABD serisi, tam örneklemde daha zayıf ve bir gecikmeli dayanıklı kontrole yoğunlaşan destek verir. Uluslararası panellerde FAO toplam tavuk verileri ilgili bir konvansiyonel aday örüntü gösterir, fakat artık otokorelasyonu ve örneklem kısıtları bunun istikrarlı bir panel Granger sonucu olarak yorumlanmasını engeller. Eurostat yumurtacı tavuk verileri ve eşleştirilmiş FAO-Eurostat örtüşmesi istikrarlı bir yönü desteklemez. Makalenin katkısı yeni bir Granger tahmininden fazlasıdır. Belirsiz bir kaynak notunu yeniden üretilebilir bir veri kurma ve tahmin iş akışına dönüştürür.

Anahtar Kelimeler

• replikasyon
• Granger nedenselliği
• kümes hayvanları iktisadı
• zaman serileri
• panel veri

Chickens, eggs, and replication

Öz

Thurman and Fisher (1988) report that egg output Granger-predicts chicken stocks in annual U.S. data, while chicken stocks do not predict egg output. This paper rebuilds their 1930-1983 series from USDA Agricultural Statistics yearbooks, records the publication vintages behind each candidate series, compares 66 plausible vintage paths with the published table, and extends the selected series through 2025. The closest reconstruction matches the original direction. Egg output predicts later chicken stocks, while chicken stocks do not predict later egg output. Log-growth estimates for 1930-1983 preserve that direction, while the pooled 1930-2025 U.S. series gives weaker full-sample support concentrated in the one-lag robust check. In international panels, FAO total-chicken data show a related conventional candidate pattern, but residual autocorrelation and sample restrictions prevent treating it as a stable panel Granger result. Eurostat laying-hen data and the matched FAO-Eurostat overlap do not support a stable direction. The paper contributes more than a new Granger estimate. It turns a vague source note into a reproducible data-construction and estimation workflow.

Anahtar Kelimeler

• replication
• Granger causality
• poultry economics
• time series
• panel data

Kaynakça

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