Supermarket price dataset on gluten-containing and gluten-free foods

The dataset is obtained by surveying the on-line shop of four major supermarkets in the UK in August 2014. The sample of supermarkets is composed by the top-three and one major upscale chain, which jointly controlled 68% of UK market shares in 2014. All of them had a dedicated web-page for on-line shopping with an explicit indication for gluten-free products. Data were collected on a survey window of 30 days in August 2014. The search focused on all the products in the "Bread and Cereals" COICOP category, which includes the following five groups: bread, flour, cakes buns and pastries, biscuits and crispbread, other cereals and cereal products and their subgroups. Prices (in pence per 100 grams) of all gluten-containing cereal products in each group were collected. Similarly, prices (in pence per 100 grams) of all gluten-free cereal products in each group were collected. Only those products certified as suitable for coeliac consumers were classified as gluten-free.

本数据集采集自2014年8月英国四家大型连锁超市的线上店铺。本次采样的超市涵盖英国2014年市场份额合计达68%的前三大连锁超市与一家高端连锁超市，四家主体共同掌控该比例的市场份额。四家超市均设有专属线上购物网页，并明确标注无麸质（gluten-free）商品专区。数据采集窗口为2014年8月的30天周期。本次调研聚焦国际消费支出分类（Classification of Individual Consumption According to Purpose, COICOP）中“面包与谷物制品”类目下的全部商品，该类目包含五大子类：面包、面粉、蛋糕、小面包与酥点、饼干与脆饼、其他谷物及谷物制品，及其下属子类别。研究人员采集了该类目下各子类中所有含麸质谷物制品与无麸质谷物制品的单价，单位均为每100克便士。仅经认证适合乳糜泻（coeliac）消费者食用的商品，方可被归类为无麸质产品。