By Jo Craven McGinty 

Black Friday--the traditional opening day for holiday spending--is nearly here, and with it will arrive forecasts of total holiday sales. The predictions are important because they signal the strength of the retail sector, an important driver of the nation's economy, and guide investor decisions. But Black Friday spending isn't the best indicator of future sales.

"Traditionally, people think that whatever happens on Black Friday sets the scene for the strength or weakness of sales for the whole holiday season," said Paul Dales, an economist with Capital Economics, a research company based in London. "It's an okay relationship. Sometimes it works. Sometimes it doesn't."

Holiday sales are generally defined as retail sales made in November and December. Last year, those months accounted for almost 20% of sales for the entire year. And if you include January--when retailers offer additional sales and people spend the gift cards they received in December--the figure climbed to about 27%.

By the time the season starts, retailers have made several key decisions.

"The stores have already made their bet," said Steve Blitz, chief economist with ITG, an investment management firm. "What they have in store, how much they have in inventory, and the number of temp workers they've put into the stores. Black Friday tells them whether they made good decisions or bad decisions."

To gauge how well Black Friday sales reflect all holiday sales, Mr. Dales and his colleague Andrew Hunter charted 20 years of year-over-year figures for Thanksgiving week against year-over-year sales for November through January.

If Black Friday sales were a reliable forecaster of all holiday sales, the trends would match. But Black Friday sales bounced up and down like an erratic heartbeat.

In 2004, Black Friday looked weak compared with all holiday sales. The following year, the two looked similar, only to diverge the year after that. In 2008, Black Friday sales looked stronger than all holiday sales. And in the last two or three years, the two trends again matched.

The correlation is likely to grow worse because more consumers now shop online, and bricks-and-mortar stores encourage shoppers to start spending earlier. Last year, many opened on Thanksgiving Day, and this year, Wal-Mart plans to offer holiday sales the entire week of Thanksgiving.

"The question is are you just pulling from the future months or are you prompting households to spend more?" Mr. Dales said.

One way to get a better handle on the question is to look at other measures.

One that tracks well with total holiday sales, Mr. Dales said, is year-over-year estimates of consumer spending collected by the Gallup Spending Survey, which asks respondents how much money they expect to spend. Gallup collects the data in a telephone survey of a randomly sampled adults living in all 50 states and the District of Columbia. The sample is weighted to correct for selection bias and to match national demographics.

While the Gallup findings have tracked fairly well with overall sales, not all consumer spending surveys are equal.

Barry Ritholtz, a wealth manager who writes about the economy, regularly takes aim at the National Retail Federation's consumer survey, which often indicates large increases in spending over Thanksgiving weekend.

"Humans are notoriously bad at predicting their own behavior," Mr. Ritholtz said. "They don't remember what they did, they don't know what they're doing, and they have no idea what they're going to do in the future."

The National Retail Federation's estimates of total holiday sales, which tend to be more modest, don't use the results of the federation's consumer survey.

Another potential predictor of overall holiday sales is retail hiring leading into the holiday.

Mr. Dales and Mr. Hunter plotted the number of retail workers hired in October against sales.

The employment figures, from the U.S Bureau of Labor Statistics, are seasonally adjusted to strip out normal increases in holiday employment to isolate increases attributable to the strength or weakness of the economy.

In effect, holiday hiring represents the retailers' expectations of what lies ahead, and the figures, though not perfectly correlated, track pretty well with holiday sales over the last 20 years. Years when retailers hire strongly in October generally saw strong holiday sales, and years when employers hired fewer temporary workers disappointed.

According to Capital Economics, this year's retail hiring figures and the Gallup survey results forecast an increase in holiday spending of about 6%. That, combined with growing employment and rising incomes, suggest consumers will be ready to part with their cash this holiday season.

It just might not happen on Black Friday.

Write to Jo Craven McGinty at Jo.McGinty@wsj.com

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