By Wallace Witkowski, MarketWatch

SAN FRANCISCO (MarketWatch) -- Consumer-related stocks, at the vanguard of this year's rally, may face particular headwinds this week as retailers report earnings and a slew of consumer data hits investors.

While earnings and economic data have not been particularly strong, it's difficult to tell that from stock performance. This quarter alone, the Dow Jones Industrial Average (DJI) is up 3.7%, the S&P 500 Index (SPX) has advanced 4.1%, and the Nasdaq Composite Index (RIXF) has grown 5.2%. Both the Dow and the S&P 500 gained 1% this past week, with the Nasdaq up nearly 2%.

Plus, the Dow industrials and S&P 500 continue to push against all-time highs. While some have said the mantra of "sell in May, and go away" isn't in play this year, others see stocks as being stretched and ripe for a correction. Additionally, Federal Reserve Chairman Ben Bernanke on Friday said the central bank was on the lookout for any excessive risk taking in investors's "reach for yield."

With a lack of data in the past week, the market may face more of a headwind in the coming week as investors are hit with a torrent, said Scott Armiger, manager of the Christiana Trust at Wilmington Savings Fund Society.

With consumer spending such a large part of the economy and more than 90% of S&P 500 companies having reported earnings, investors are likely to be more sensitive to the data given most are looking for a correction out of the corner of their eye and markets are well past several strategists's targets for the year.

Here comes a big mess of consumer data with a side of retailer earnings

Consumer data will get a fair amount of play with April retail sales data on Monday, the April consumer price index on Thursday, and May consumer sentiment on Friday. A recent pickup in energy prices will likely make higher payroll taxes more noticeable to consumers, Armiger said.Read Economic Preview: Consumers are holding up relatively well.

"As the tailwind of lower gas prices ends, I don't think the consumer gets any more help," Armiger said.

Add to that retailer earnings this week and it could get messy for those sectors which have enjoyed quite a rally this year. Consumer discretionary stocks are up nearly 20% and consumer staples are up nearly 18%, the second- and third-best industry sectors on the S&P 500. They've outpaced the 14.5% rise for the benchmark.

This week Macy's Inc. (M), Nordstrom Inc. (JWN), Kohl's Corp. (KSS), J.C. Penney Co. (JCP), and Wal-Mart Stores Inc. (WMT) report quarterly earnings. The week after that TJX Cos. (TJX) , Home Depot Inc. (HD) , Target Corp. (TGT) , Dollar Tree Inc. (DLTR) , and Ross Stores Inc. (ROST) report.

(Read more on retail at the Behind the Storefront blog: http://blogs.marketwatch.com/behindthestorefront/.)

Other data points coming out include the April producer price index, the May Empire State index, and May homebuilders index on Wednesday.

Don't get too tied to any one data point

Even though this week is data-rich as opposed to last week's data-poor week, Tobias Levkovich, chief U.S. equity strategist at Citi Research, said that investors shouldn't get too tied to one data point.

Levkovich, who prefers a big picture view, said the lack of a slump so far in the market isn't the result of one data point or another, but more a read of longer-term conditions.

"Credit conditions were telling us last fall we weren't going to have a slump," Levkovich said.

What concerns Levkovich more is late summer "when people realize Europe's still struggling," he said. Also of interest is what comes out of this year's Federal Reserve conference in Jackson Hole, Wyo., and how politicians handle the debt ceiling in September , he said.

Levkovich, who is sticking by his 1,615 S&P 500 end-of-year target, currently sees consumer staples and health-care stocks as being stretched, with utilities as more attractive.

Health-care stocks out on a limb?

Health-care stocks, the best performing sector this year with a nearly 21% gain, have not been getting that strength from their core pharmaceuticals companies but rather from more volatile biotech companies and from managed-care companies reaping Medicare benefits. The sector also accounts for a fair share of revenue misses this earnings season with 66% of companies falling short of Wall Street estimates, compared with a 53% miss for S&P 500 companies, while health-care earnings have slipped 0.1%, according to Thomson Reuters figures.

While sectors such as energy and materials have also had lower revenue and a high percentage of misses, those declines are firmly linked to lower commodities prices unlike in the health care sector. That's a cause for concern, says Levkovich.

Read Health Exchange for more on health-care stocks.

Broadly, stocks have benefitted from more upward earnings revisions this season with 54.8% of S&P 500 companies raising some part of their outlook, compared with 46.2% in March, Levkovich said. That could prove to be problematic in the future given that many companies topped lowered expectations this season.

For the first quarter, out of the 451 companies in the S&P 500 that have reported, earnings have grown 5.7%, while revenue has slipped 0.2%, according to Thomson Reuters.

Key themes coming out of earnings season thus far include margin support from low inflation and stronger pricing, challenges from international growth, and how the sequester and higher payroll taxes have affected business, according to Goldman Sachs in its recent S&P 500 Beige Book.

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