BOSTON ( TheStreet) -- The following are three ratings changes from TheStreet's stock model.3. The model upgraded home-products seller Williams-Sonoma ( WSM) to "buy." Williams-Sonoma operates the Williams-Sonoma and Pottery Barn stores and sells directly to consumers through its magazines and e-commerce sites. Quarter: Fiscal fourth-quarter profit rose six-fold to $88 million, or 81 cents a share, as revenue grew 8.1% to $1.1 billion. The operating margin expanded from 3.2% to 13%. Williams-Sonoma holds $514 million of cash and $10 million of debt. Stock: Williams-Sonoma has surged 139% in the past year, outperforming U.S. indices. The stock trades at a PEG ratio, a measure of value relative to expected growth, of 0.8, a discount to its peer-group average. A PEG ratio below 1 implies a bargain. Consensus: Of analysts covering Williams-Sonoma, two advise purchasing its shares, 18 recommend holding and three suggest selling them. Sterne, Agee & Leach projects a share price of $32, leaving a potential 20% gain in the weeks ahead. 2. The model downgraded Baytex Energy Trust ( BTE) to "hold." Baytex is an investment trust that acquires oil and gas deposits in Canada. It plans to convert to a corporation by the end of 2010 due to a change in Canada's trust taxation. Quarter: Fourth-quarter profit tumbled 47% to $28 million, or 25 cents, as revenue climbed 17% to $198 million. The operating margin jumped from 2.8% to 13%. Baytex's balance sheet contains $10 million of cash and $423 million of debt. Stock: Baytex Energy Trust has soared 176% during the past 12 months, beating major benchmarks. The stock sells for a price-to-sales ratio of 5.8, a 42% discount to the industry average. It's costly based on trailing earnings and cash flow. Consensus: Of researchers evaluating Baytex Energy Trust, seven, or 64%, rate its stock "buy, three rate it "hold" and one ranks it "sell." Macquarie expects the stock to advance 12% to $39.28. Raymond James believes it will outperform peers.