For one, the groups noted the analysis is a retrospective study, not a prospective, randomized controlled clinical trial, which many regard as a gold standard for ferreting out safety concerns.
Relative performance and volume analysis confirms these four industry groups are outperforming the market, writes Tom Aspray , and he identifies stocks from each group that may soon set up as good buys.
Seasonal analysis of the various industry groups shows that the Market Vectors Semiconductor ETF ( SMH) typically bottoms in October and then has a last surge to the upside in March and April before it typically tops out.