Retail VariabilityMeasures of Sampling Variability - U.S. Retail Trade Sales - Total and E-commerce: 2013 and 2012[Estimates are based on data from the 2013 Annual Retail Trade Survey. Estimates are shown as percents.]NAICS CodeDescriptionCoefficients of Variation forStandard Error for Estimate of:20132012Y/Y Percent ChangeE-commerce asPercent ofTotal SalesPercent Distribution of E-commerceTotal SalesE-commerceRevised Total SalesRevised E-commerceTotal SalesE-commerce201320122013Total Retail Trade0.20.60.00.40.20.6ZZNA441Motor vehicles and parts dealers0.43.30.03.10.41.90.10.10.3442Furniture and home furnishings stores0.623.10.025.00.67.00.10.10.1443Electronics and appliance stores0.612.00.0S0.6S0.2S0.1444Building materials and garden equipment and supplies stores0.728.80.0S0.5S0.1S0.1445Food and beverage stores0.37.00.06.90.23.2ZZZ446Health and personal care stores0.927.90.025.50.929.7ZZ0.1447Gasoline stations0.5Z0.0S0.5SZSS448Clothing and clothing accessories stores0.311.70.012.60.34.30.20.20.2451Sporting goods, hobby, book, and music stores0.512.80.012.30.67.60.30.30.1452General merchandise storesZ1.60.02.2Z0.7ZZZ453Miscellaneous store retailers0.812.50.09.30.68.70.30.20.1454Nonstore retailers0.50.70.00.40.50.60.20.20.44541Electronic shopping and mail-order houses0.60.70.00.40.60.60.20.20.4NA - Cannot be computed(S) Corresponding estimate in Table 5 does not meet publication standards because of high sampling variability (coefficient of variation is greater than 30%) or poor response quality (total quantity response rate is less than 50%). For a description of publication standards and the total quantity response rate, see .(Z) Estimate is less than 0.05.Note: Retail total and other subsector totals may include data for kinds of business not shown. Additional information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions can be found on the Internet at ..Source: U.S. Census Bureau, 2013 Annual Retail Trade Survey