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Showing posts with label indicator. Show all posts
Showing posts with label indicator. Show all posts

Wednesday, August 8, 2007

Oscillators and Trend Following Indicators

For the purpose of this lesson, let’s broadly categorize all of our technical indicators into one of two categories:

1. Oscillators - Oscillators are leading indicators.
2. Trend following or momentum indicators - Momentum indicators are lagging indicators.

While the two can be supportive of each other, they're more likely to conflict with each other. We’re not saying that one or the other should be used exclusively, but you must understand the potential pitfalls of each.

Oscillators / Leading Indicators

An oscillator is any object or data that moves back and forth between two points. In other words, it’s an item that is going to always fall somewhere between point A and point B. Think of when you hit the oscillating switch on your electric fan.

Think of our technical indicators as either being “on” or “off”. More specifically, an oscillator will usually signal “buy” or “sell”, with the only exception being instances when the oscillator is not clearly at either end of the buy/sell range.

Does this sound familiar? It should! Stochastics, Parabolic SAR, and the Relative Strength Index (RSI) are all oscillators. Each of these indicators is designed to signal a possible reversal, where the previous trend has run its course and the price is ready to change direction.

A few examples :

On the 1-hour chart of USD/EUR below, we have added a Parabolic SAR indicator, as well as an RSI and Stochastic oscillator. As you have already learned, when the Stochastic and RSI begin to leave their “oversold” region that is a buy signal.

Here we get buy signals between the hours 3:00 am EST and 7:00 am EST on 08/24/05. All three of these buy signals occurred within one or two hours of each other, and this would have been a good trade.



We also got a sell signal from all three indicators between the hours of 2:00 am EST and 5:00 am EST on 08/25/05. As you can see, the Stochastic indicator remained in the overbought for a pretty long time - about 20 hours. Usually when an oscillator remains in the overbought or oversold levels for a long period of time, that means there is a strong trend occurring. In this example, since Stochastic stayed overbought, you see there was a strong uptrend present.
Now let’s take a look at the Chrise leading oscillators messing up, just so you know these signals aren’t perfect. Looking at the chart below, you can quickly see that there were a lot of false buy signals popping up. You’ll see how one indicator says to buy, while the other one is still saying sell.



Around 1 am EST on 08/16/05, both RSI and Stochastic gave buy signals, while Parabolic SAR still showed a sell signal. Yes, Parabolic SAR gave a buy signal 3 hours later at 4 am EST, but then Parabolic SAR turned into a sell signal one bar later. If you actually look at the bar with the Parabolic SAR below it, notice how it’s a strong looking red bar with very short shadows. Also, notice how the next bar closed below it. This would not have been a good long trade.

On the last two oversold (buy) signals given by Stochastic, notice how there is no indicator at all for RSI, but Parabolic SAR is giving sell signals. What’s going on here? They are each giving you different signals!

The answer lies in the method of calculation for each one. Stochastic is based on the high-to-low range of the time period (in this case, it’s hourly), yet doesn’t account for changes from one hour to the next. The Relative Strength Index (RSI) uses change from one closing price to the next. And Parabolic SAR has its own unique calculations that can further cause conflict.

That’s the nature of oscillators – they assume that a particular chart pattern always results in the Chrise reversal.

While being aware of why a leading indicator may be in error, there’s no way to avoid them. If you’re getting mixed signals, you’re better off doing nothing than taking a ‘best guess’. If a chart doesn’t meet all your criteria, don’t force the trade! Move on to the next one that does meet your criteria.

So how do we spot a trend? The indicators that can do so have already been identified as MACD and moving averages. These indicators will spot trends once they have been established, at the expense of delayed entry. The bright side is that there’s less chance of being wrong.

On this 1-hour chart of EUR/USD, there was a bullish crossover for MACD at 3:00 am EST on 08/03/05 and the 10 period EMA crossed over the 20 period EMA at 5:00 am. These two signals were all accurate, but if you waited for both indicators to give you a bull signal, you would have missed out on the big move. If you calculate from the start of the uptrend at 10:00 pm EST on 08/02/05 to the close of the candle at 5:00 am EST on 08/03/05, you would have watched a gain of 159 pips while sitting on the sidelines.



Let’s take a look at the same chart so you can see how these crossover signals can sometimes give false signals. We like to call them “fake-outs”. Look at how there was a bearish MACD crossover after the uptrend we just discussed.

Ten hours later, the 20 EMA crossed below the 10 EMA giving a “sell” signal. As you can see, the price didn’t drop but stayed pretty much sideways, then continued its uptrend. By the time both indicators were in agreement, you would’ve entered a short trade at the bottom and set yourself up for a loss.


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Monday, August 6, 2007

Leading versus Lagging Indicators

There are two types of indicators:
  1. leading.
  2. lagging.
A leading indicator gives a buy signal before the new trend or reversal occurs.

A lagging indicator gives a signal after the trend has started and basically informs you “to pay attention”, the trend has started.

You would “catch” the entire trend every single time, IF the leading indicator was correct every single time. But it’s not.

When you use leading indicators, you will experience a lot of fake-outs. Leading indicators are notorious for giving bogus signals which will “mislead” you.

The other option is to use lagging indicators, which aren’t as prone to bogus signals. Lagging indicators only give signals after the price change is clearly forming a trend. The downside is that you’d be a little late in entering a position. Often the biggest gains of a trend occur in the first few bars, so by using a lagging indicator you could potentially miss out on much of the profit.

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Thursday, August 2, 2007

Relative Strength Index (RSI)

Relative Strength Index, or RSI, is similar to stochastics in that it identifies overbought and oversold conditions in the market. It is also scaled from 0 to 100. Typically, readings below 20 indicate oversold, while readings over 80 indicate overbought.



Using RSI


RSI can be used just like stochastics. From the chart above you can see that when RSI dropped below 20, it correctly identified an oversold market. After the drop, the price quickly shot back up.



RSI is a very popular tool because it can also be used to confirm trend formations. If you think a trend is forming, take a quick look at the RSI and look at whether it is above or below 50. If you are looking at a possible uptrend, then make sure the RSI is above 50. If you are looking at a possible downtrend, then make sure the RSI is below 50.



In the beginning of the chart above, we can see that a possible uptrend was forming. To avoid fakeouts, we can wait for RSI to cross above 50 to confirm our trend. Sure enough, as RSI passes above 50, it is a good confirmation that an uptrend has actually formed.

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Sunday, July 22, 2007

Stochastics

Stochastics are another indicator that helps us determine where a trend might be ending. By definition, a stochastic is an oscillator that measures overbought and oversold conditions in the market. The 2 lines are similar to the MACD lines in the sense that one line is faster than the other.



How to Apply Stochastics

Stochastics tells us when the market is overbought or oversold. Stochastics are scaled from 0 to 100. When the stochastic lines are above 70 (the red dotted line in the chart above), then it means the market is overbought. When the stochastic lines are below 30 (the blue dotted line), then it means that the market is oversold. As a rule of thumb, we buy when the market is oversold, and we sell when the market is overbought.



Looking at the chart above, you can see that the stochastics has been showing overbought conditions for quite some time. Based upon this information, can you guess where the price might go?



If you said the price would drop, then you are absolutely correct! Because the market was overbought for such a long period of time, a reversal was bound to happen.

That is the basics of stochastics. Many traders use stochastics in different ways, but the main purpose of the indicator is to show us where the market is overbought and oversold. Over time, you will learn to use stochastics to fit your own personal trading style.

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Thursday, July 12, 2007

Parabolic SAR

Up until now, we’ve looked at indicators that mainly focus on catching the beginning of new trends. And although it is important to be able to identify new trends, it is equally important to be able to identify where a trend ends. After all, what good is a well-timed entry without a well-timed exit?



One indicator that can help us determine where a trend might be ending is the Parabolic SAR (Stop And Reversal). A Parabolic SAR places dots, or points, on a chart that indicate potential reversals in price movement. From the chart above, you can see that the dots shift from being below the candles during the uptrend, to above the candles when the trend reverses into a downtrend.

Using Parabolic SAR

The nice thing about the Parabolic SAR is that it is really simple to use. Basically, when the dots are below the candles, it is a buy signal; and when the dots are above the candles, it is a sell signal. This is probably the easiest indicator to interpret because it assumes that the price is either going up or down. With that said, this tool is best used in markets that are trending, and that have long rallies and downturns. You DON’T want to use this tool in a choppy market where the price movement is sideways.

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Tuesday, June 12, 2007

Moving Average Convergence Divergence (MACD)

MACD is an acronym for Moving Average Convergence Divergence. This tool is used to identify moving averages that are indicating a new trend, whether it’s bullish or bearish. After all, our first priority in trading is being able to find a trend, because that is where the most money is made.




With an MACD chart, you will usually see three numbers that are used for its settings.

• The first is the number of periods that is used to calculate the faster moving average.
• The second is the number of periods that are used in the slower moving average.
• And the third is the number of bars that is used to calculate the moving average of the

difference between the faster and slower moving averages.

For example, if you were to see “12,26,9” as the MACD parameters (which is usually the default setting for most charting packages), this is how you would interpret it:

• The 12 represents the previous 12 bars of the faster moving average.
• The 26 represents the previous 26 bars of the slower moving average.
• The 9 represents the previous 9 bars of the difference between the two moving averages. This

is plotted by vertical lines called a histogram (The blue lines in the chart above).

There is a common misconception when it comes to the lines of the MACD. The two lines that are drawn are NOT moving averages of the price. Instead, they are the moving averages of the
DIFFERENCE between two moving averages.

In our example above, the faster moving average is the moving average of the difference between the 12 and 26 period moving averages. The slower moving average plots the average of the previous MACD line. Once again, from our example above, this would be a 9 period moving average.

This means that we are taking the average of the last 9 periods of the faster MACD line, and plotting it as our “slower” moving average. What this does is it smoothes out the original line even more, which gives us a more accurate line.

The histogram simply plots the difference between the fast and slow moving average. If you look at our original chart, you can see that as the two moving averages separate, the histogram gets bigger. This is called divergence, because the faster moving average is “diverging” or moving away from the slower moving average.

As the moving averages get closer to each other, the histogram gets smaller. This is called convergence because the faster moving average is “converging” or getting closer to the slower moving average. And that, my friend, is how you get the name, Moving Average Convergence Divergence! Whew, we need to crack our knuckles after that one!

MACD Crossover


Because there are two moving averages with different “speeds”, the faster one will obviously be quicker to react to price movement than the slower one. When a new trend occurs, the fast line will react first and eventually cross the slower line. When this “crossover” occurs, and the fast line starts to “diverge” or move away from the slower line, it often indicates that a new trend has formed.


From the chart above, you can see that the fast line crossed under the slow line and correctly identified a new downtrend. Notice that when the lines crossed, the histogram temporarily disappears. This is because the difference between the lines at the time of the cross is 0. As the downtrend begins and the fast line diverges away from the slow line, the histogram gets bigger, which is good indication of a strong trend.

There is one drawback to MACD. Naturally, moving averages tend to lag behind price. After all, it's just an average of historical prices. Since the MACD represents moving averages of other moving averages and is smoothed out by another moving average, you can imagine that there is quite a bit of lag. However, it is still one of the most favored tools by many traders.

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Saturday, June 2, 2007

Bollinger Bands

Bollinger bands are used to measure a market’s volatility. Basically, this little tool tells us whether the market is quiet or whether the market is Loud! When the market is quiet, the bands contract; and when the market is Loud, the bands expand. Notice on the chart below that when the price was quiet, the bands were close together, but when the price moved up, the bands spread apart.




That’s all there is to it. Yes, we could go on and bore you by going into the history of the Bollinger band, how it is calculated, the mathematical formulas behind it, and so on and so forth, but we really didn’t feel like typing it all out.

In all honesty, you don’t need to know any of that junk. We think it’s more important that we show you some ways you can apply the Bollinger bands to your trading.
The Bollinger Bounce

One thing you should know about Bollinger Bands is that price tends to return to the middle of the bands. That is the whole idea behind the Bollinger bounce (smart, huh?). If this is the case, then by looking at the chart below, can you tell us where the price might go next?



If you said down, then you are correct! As you can see, the price settled back down towards the middle area of the bands.



That’s all there is to it. What you just saw was a classic Bollinger bounce. The reason these bounces occur is because Bollinger Bands act like mini support and resistance levels. The longer the time frame you are in, the stronger these bands are. Many traders have developed systems that thrive on these bounces, and this strategy is best used when the market is ranging and there is no clear trend.

Now let’s look at a way to use Bollinger Bands when the market does trend.

Bollinger Squeeze

The Bollinger squeeze is pretty self explanatory. When the bands “squeeze” together, it usually means that a breakout is going to occur. If the candles start to break out above the top band, then the move will usually continue to go up. If the candles start to break out below the lower band, then the move will usually continue to go down.



Looking at the chart above, you can see the bands squeezing together. The price has just started to break out of the top band. Based on this information, where do you think the price will go?



If you said up, you are correct! This is how a typical Bollinger Squeeze works. This strategy is designed for you to catch a move as early as possible. Setups like these don’t occur everyday, but you can probably spot them a few times a week if you are looking at a 15 minute chart.

So now you know what Bollinger Bands are, and you know how to use them. There are many other things you can do with Bollinger Bands, but these are the 2 most common strategies associated with them. So now you can put this in your trader’s toolbox, and we can move on to the next indicator.

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