NEW YORK ( TheStreet) -- Today's buy-and-trade earnings previews 11 companies; two from the computer and technology sector, two from the finance sector, and one each from the aerospace, autos-tires-trucks, basic materials, consumer discretionary, multi-sector conglomerates, oils-energy and retail-wholesale sectors.The ValuEngine valuation warning intensified with 78.2% of all stocks being overvalued, 46.3% by 20% or more. 15 of 16 sectors are overvalued, all by double-digit percentages, ten by 20.2% to 26.3%. The aerospace sector is 22.1% overvalued with an underweight rating. 67.6% of the 74 stocks in this sector have sell or strong sell ratings. The autos-tires-trucks sector is 26.2% overvalued with an underweight rating. 40.2% of the 97 stocks in this sector have sell or strong sell ratings. The basic materials sector is 4.5% undervalued with an underweight rating. 57.4% of the 401 stocks in this sector have sell or strong sell ratings. The computer and technology sector is 24.3% overvalued with an overweight rating. 47.4% of the 1155 stocks in this sector have buy or strong buy ratings.