NEW YORK ( TheStreet) -- Over the next two days I will preview earnings reports from 13 companies, seven in the retail-wholesale sector, three in the computer and technology sector and one each in the industrial product, construction and consumer staples sectors.Here I profile seven companies that report their quarterly earnings on Tuesday and Wednesday. These companies include the worldwide leader in Internet networking, a provider of Internet applications, a provider of paint and coatings, an agriculture equipment manufacturer, a family-oriented apparel and home furnishing retailer, a sporting goods retailer and the retailer that sponsors the Thanksgiving Day Parade and the July 4th fireworks display in New York City. Before the wave of retail earnings reports, the July reading on Retail Sales will be released at 8:30 a.m. Tuesday. Estimates range from a decline of 0.2% to a rise of 0.3%. The ValuEngine shows that the retail-wholesale sector is 24% overvalued with an overweight rating. The computer and technology sector is 21.2% overvalued with an overweight rating. The consumer staples sector is 20.9% overvalued with an overweight rating. The construction sector is 15.3% overvalued with an underweight rating. The industrial products sector is 19.6% overvalued with an underweight rating. Among the seven stocks profiled today, four have buy ratings and three have hold ratings. Two stocks are slightly undervalued, and only one is overvalued by more than 20%. Four had double-digit gains over the last 12 months. Two are below their 200-day simple moving averages. The risk of a reversion to the mean is thus a factor for six of the stocks.