Here's a look at the best and worst of exchange-traded funds this week.

Winners

PowerShares DB Crude Oil Double Short ( DTO) +17.8%

I first mentioned DTO as a hedge against falling markets on Monday, when it was trading around $87. I offered it as a way to bet on falling energy prices on Wednesday (instead of shorting U.S. Natural Gas ( UNG)) when it was trading around $91.50. It turned out to be one of the best performing ETFs and ETNs this week.

Besides DTO, I also mentioned PowerShares DB U.S. Dollar Bullish ( UUP) and CurrencyShares Japanese Yen ( FXY). UUP was flat for the week and FXY gained more than 3% from last week's close.

Market Vectors Indonesia ( IDX), up 2.2% was also a winner. I mentioned it on Thursday following the re-election of President Yudhoyono and covered it in more detail previously.Investors hope that his victory will lead to a Chinese-style infrastructure build-out that can deliver accelerated GDP growth.

iShares South Korea ( EWY), +2.5%, bounced higher this week after Samsung, it's No. 1 holding at more than 16% of assets, guided analysts higher for second-quarter earnings on Monday. EWY gained for the week, but it lost the Samsung gains and closed below its Monday open. A suspected North Korean led cyberattack on South Korea and U.S. systems may have contributed to the tepid week.

Losers

PowerShares WilderHill Clean Energy ( PBW) -12.1%.

Market Vectors Solar ( KWT) -12.7%.

With the S&P 500 index down 1.9% for the week, there were a lot more losers than winners. Solar ETFs were one sector that took a beating. Solar ETFs tend to track oil, but with more volatility.

iShares FTSE NAREIT Retail ( RTL) -9.7%.

The retail sector had mixed same-store sales reports. They were mostly down, but better than expected in many cases, and PowerShares Dynamic Retail ( PMR) had a 0.5% gain for the week. Meanwhile, the extremely thinly traded iShares FTSE NAREIT Retail ( RTL), which invests in retail real estate, tanked 9.7%. This fund suffers from being in two of the weaker sectors of the economy -- retail and commercial real estate.

PowerShares DB Oil ( DBO) -7.4%

iPath Nickel ( JJN) -12.7%.

Market Vectors Russia ( RSX) -12.5%.

Market Vectors Gold Miners ( GDX) -8.3%.

U.S. Natural Gas ( UNG) -6%.

Obviously, if DTO were a winner, oil ETFs were losers. The unemployment report from July 2 continued to generate news all week, and the skeptical take on the recovery dominated. Energy prices were hit hard as prices tumbled quickly, and there was barely any rebound.

Don Dion is the publisher of the Fidelity Independent Adviser family of newsletters, which provides to a broad range of investors his commentary on the financial markets, with a specific emphasis on mutual funds and exchange-traded funds. With more than 100,000 subscribers in the U.S. and 29 other countries, Fidelity Independent Adviser publishes six monthly newsletters and three weekly newsletters. Its flagship publication, Fidelity Independent Adviser, has been published monthly for 11 years and reaches 40,000 subscribers.

Dion is also president and founder of Dion Money Management, a fee-based investment advisory firm to affluent individuals, families and nonprofit organizations, where he is responsible for setting investment policy, creating custom portfolios and overseeing the performance of client accounts. Founded in 1996 and based in Williamstown, Mass., Dion Money Management manages assets for clients in 49 states and 11 countries. Dion is a licensed attorney in Massachusetts and Maine and has more than 25 years' experience working in the financial markets, having founded and run two publicly traded companies before establishing Dion Money Management.

More from ETFs

3 Great Stock Market Sectors Millennials Should Invest In

3 Great Stock Market Sectors Millennials Should Invest In

Why Millennials Are Ditching Stocks for ETFs

Why Millennials Are Ditching Stocks for ETFs

60 Seconds: What's the Difference Between an ETF and a Mutual Fund?

60 Seconds: What's the Difference Between an ETF and a Mutual Fund?

Video: Why Shark Tank Star Kevin O'Leary Is Doubling Down on Internet Stocks

Video: Why Shark Tank Star Kevin O'Leary Is Doubling Down on Internet Stocks

Simple Investing Strategies Stand the Test of Time

Simple Investing Strategies Stand the Test of Time