Last week's stock market strength was powered by bull market gains for transportation, as well as for the materials, industrial, consumer discretionary, energy, financial and technology sectors. The exchange-traded funds that track these sectors also gained. These are baskets of stocks in these particular sectors.

The lagging S&P 500 sector ETFs, however, remain the ones you'd think were safe: real estate, consumer staples, health care and utilities. These four laggards have decent gains off their 2016 lows, but real estate and utilities are in correction territory. Only real estate and health care are down year to date.

Here's this week's scorecard for the 11 exchange-traded funds that represent each of the sectors of the S&P 500.

The SPDR Dow Jones REIT ETF (RWR) ended last week at $90.15, down 1.6% year to date, and in correction territory 13.6% below its all-time intraday of $104.34 set on July 29.

The weekly chart for RWR is negative but oversold with the ETF below its key weekly moving average of $91.53 and above its 200-week simple moving average of $85.69, last tested during the week of Feb. 12, when the average was $81.06. The weekly momentum reading inched up to 13.66 last week up from 12.58 on Nov. 18, becoming less overbought versus the threshold of 80.00.

Courtesy of MetaStock Xenith

Investors looking to buy the REIT ETF should do so on weakness to $85.69, which is the 200-week simple moving average. Investors looking to reduce holdings should consider selling strength to $101.16, which is a key level on technical charts until the end of 2016.

The Materials Select Sector SPDR Fund (XLB) ended last week at $49.56, up 14.1% year to date, and in bull market territory 36.6% above its Jan. 20 low of $36.29.

The weekly chart for XLB is positive with the ETF above its key weekly moving average of $47.89 and above its 200-week simple moving average of $45.64, last tested during the week of July 1, when the average was $44.51. The weekly momentum reading rose to 52.90 last week up from 40.16 on Nov. 18.

Courtesy of MetaStock Xenith

Investors looking to buy the materials ETF should do so on weakness to $45.64, which is the 200-week simple moving average. Investors looking to reduce holdings should consider selling strength to $53.66, which is a key level on technical charts until the end of 2016.

The Industrial Select Sector SPDR Fund (XLI) ended last week at $62.71, up 18.3% year to date and set its all-time intraday high of $62.71 on Nov. 25. This sector is benefiting from the notion that industrial companies will win on infrastructure spending initiatives. This ETF is in bull market territory 33.9% above its Jan. 20 low of $46.82.

The weekly chart for XLI is positive with the ETF above its key weekly moving average of $59.48 and above its 200-week simple moving average of $52.25, last tested during the week of Jan. 22 when the average was $47.92. The weekly momentum reading rose to 63.63 last week up from 46.29 on Nov. 18.

Courtesy of MetaStock Xenith

Investors looking to buy the industrial ETF should do so on weakness to $57.42, which is a key level on technical charts until the end of 2016. Investors looking to reduce holdings should do so on strength to $68.26, which is a key level on technical chart until the end of 2016.

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