What Are Charts? Types of Charts.

What Are Charts?

A price chart is a sequence of prices plotted over a specific time frame. In statistical terms, charts are referred to as time series plots.  

On the chart, the y-axis (vertical axis) represents the price scale and the x-axis (horizontal axis) represents the time scale. Prices are plotted from left to right across the x-axis with the most recent plot being the furthest right. The price plot for IBM extends from January 1, 1999 to March 13, 2000.

Technicians, technical analysts and chartists use charts to analyze a wide array of securities and forecast future price movements. The word “securities” refers to any tradable financial instrument or quantifiable index such as stocks, bonds, commodities, futures or market indices. Any security with price data over a period of time can be used to form a chart for analysis.

While technical analysts use charts almost exclusively, the use of charts is not limited to just technical analysis. Because charts provide an easy-to-read graphical representation of a security's price movement over a specific period of time, they can also be of great benefit to fundamental analysts. A graphical historical record makes it easy to spot the effect of key events on a security's price, its performance over a period of time and whether it's trading near its highs, near its lows, or in between.

Types of Charts

Let's take a look at the three most popular types of charts:

1. Line chart
2. Bar chart
3. Candlestick chart
4. Point & Figure Chart

Now, we'll explain each of the charts, and let you know what you should know about each of them.

1. Line Charts

A simple line chart draws a line from one closing price to the next closing price. When strung together with a line, we can see the general price movement of a currency pair over a period of time.
Here is an example of a line chart 

Some investors and traders consider the closing level to be more important than the open, high or low. By paying attention to only the close, intraday swings can be ignored. Line charts are also used when open, high and low data points are not available. Sometimes only closing data are available for certain indices, thinly traded stocks and intraday prices.

2. Bar Charts

A bar chart is a little more complex. It shows the opening and closing prices, as well as the highs and lows. The bottom of the vertical bar indicates the lowest traded price for that time period, while the top of the bar indicates the highest price paid. The vertical bar itself indicates the currency pair's trading range as a whole.

The horizontal hash on the left side of the bar is the opening price, and the right-side horizontal hash is the closing price.
Perhaps the most popular charting method is the bar chart. The high, low and close are required to form the price plot for each period of a bar chart. The high and low are represented by the top and bottom of the vertical bar and the close is the short horizontal line crossing the vertical bar. On a daily chart, each bar represents the high, low and close for a particular day. Weekly charts would have a bar for each week based on Friday's close and the high and low for that week.

Here is an example of a bar chart  

Take note, throughout our lessons, you will see the word "bar" in reference to a single piece of data on a chart.
A bar is simply one segment of time, whether it is one day, one week, or one hour. When you see the word 'bar' going forward, be sure to understand what time frame it is referencing.
 Bar charts are also called "OHLC" charts, because they indicate the Open, the High, the Low, and the Close for that particular currency. Here's an example of a price bar:

Open: The little horizontal line on the left is the opening price High: The top of the vertical line defines the highest price of the time period Low: The bottom of the vertical line defines the lowest price of the time period Close: The little horizontal line on the right is the closing price

3. Candlesticks Charts 

Originating in Japan over 300 years ago, candlestick charts have become quite popular in recent years. For a candlestick chart, the open, high, low and close are all required. A daily candlestick is based on the open price, the intraday high and low, and the close. A weekly candlestick is based on Monday's open, the weekly high-low range and Friday's close.

Candlestick chart show the same information as a bar chart, but in a prettier, graphic format. Candlestick bars still indicate the high-to-low range with a vertical line. However, in candlestick charting, the larger block (or body) in the middle indicates the range between the opening and closing prices. Traditionally, if the block in the middle is filled or colored in, then the currency closed lower than it opened. In the following example, the 'filled color' is black. For our 'filled' blocks, the top of the block is the opening price, and the bottom of the block is the closing price. If the closing price is higher than the opening price, then the block in the middle will be "white" or hollow or unfilled. 

Many traders and investors believe that candlestick charts are easy to read, especially the relationship between the open and the close. Grean/Blue White (clear) candlesticks form when the close is higher than the open and Reg/black (solid) candlesticks form when the close is lower than the open. The Grean/Blue/white and Red/black portion formed from the open and close is called the body (Green/Blue/white body or Red/black body). The lines above and below are called shadows and represent the high and low.  

Here at  we don't like to use the traditional black and white candlesticks. They just look so unappealing. And since we spend so much time looking at charts, we feel it's easier to look at a chart that's colored. A color television is much better than a black and white television, so why not splash some color in those candlestick charts? We simply substituted green instead of white, and red instead of black. This means that if the price closed higher than it opened, the candlestick would be green. If the price closed lower than it opened, the candlestick would be red. In our later lessons, you will see how using green and red candles will allow you to "see" things on the charts much faster, such as uptrend/downtrends and possible reversal points.

For now, just remember that we use red and green candlesticks instead of black and white and we will be using these colors from now on. heck out these candlesticks...! Awww yeeaaah! You know you like that!

Here is an example of a candlestick chart  

The purpose of candlestick charting is strictly to serve as a visual aid, since the exact same information appears on an OHLC bar chart. The advantages of candlestick charting are:

• Candlesticks are easy to interpret, and are a good place for beginners to start figuring out chart analysis.
• Candlesticks are easy to use! Your eyes adapt almost immediately to the information in the bar notation. Plus, research shows that visuals help in studying, it might help with trading as well!
• Candlesticks and candlestick patterns have cool names such as the shooting star, which helps you to remember what the pattern means.
• Candlesticks are good at identifying marketing turning points - reversals from an uptrend to a downtrend or a downtrend to an uptrend. You will learn more about this later.

Now that you know why candlesticks are so cool, it's time to let you know that we will be using candlestick charts for most, if not all of chart examples on this site.

4. Point & Figure Chart

All the charting methods shown above plot one data point for each period of time. No matter how much price movement, each day or week represented is one point, bar, or candlestick along the time scale. Even if the price is unchanged from day to day or week to week, a dot, bar, or candlestick is plotted to mark the price action. Contrary to this methodology, point & figure charts are based solely on price movement, and do not take time into consideration. There is an x-axis but it does not extend evenly across the chart.

The beauty of point & figure charts is their simplicity. Little or no price movement is deemed irrelevant and therefore not duplicated on the chart. Only price movements that exceed specified levels are recorded. This focus on price movement makes it easier to identify support and resistance levels, bullish breakouts and bearish breakdowns.

Price Scaling

There are two methods for displaying the price scale along the y-axis: arithmetic and logarithmic. An arithmetic scale displays 10 points (or dollars) as the same vertical distance no matter what the price level. Each unit of measure is the same throughout the entire scale. If a stock advances from 10 to 80 over a 6-month period, the move from 10 to 20 will appear to be the same distance as the move from 70 to 80. Even though this move is the same in absolute terms, it is not the same in percentage terms.

A logarithmic scale measures price movements in percentage terms. An advance from 10 to 20 would represent an increase of 100%. An advance from 20 to 40 would also be 100%, as would an advance from 40 to 80. All three of these advances would appear as the same vertical distance on a logarithmic scale. Most charting programs refer to the logarithmic scale as a semi-log scale, because the time axis is still displayed arithmetically. 

The chart above uses the 4th-Quarter performance of VeriSign to illustrate the difference in scaling. On the log scale version, the distance between 50 and 100 is the same as the distance between 100 and 200. However, on the arithmetic scale, the distance between 100 and 200 is significantly greater than the distance between 50 and 100.

Key points on the benefits of arithmetic and log scale charts:

• Arithmetic scales are useful when the price range is confined within a relatively tight range.
• Arithmetic scales are useful for short-term charts and trading. Price movements (particularly for stocks) are shown in absolute dollar terms and reflect movements dollar for dollar.
  
• Log scales are useful when the price has moved significantly, be it over a short or extended time frame
• Trend lines tend to match lows better on log scale charts.
• Log scale charts are useful when gauging the percentage movements over a long period of time. Large movements are put into better perspective.
  
• Stocks and many other securities are judged in relative terms through the use of ratios such as PE, Price/Revenues and Price/Book. With this in mind, it also makes sense to analyze price movements in percentage terms.

How to Pick a Time Frame

The time frame used for forming a chart depends on the compression of the data: intraday, daily, weekly, monthly, quarterly or annual data. The less compressed the data is, the more detail is displayed.

Daily data is made up of intraday data that has been compressed to show each day as a single data point, or period. Weekly data is made up of daily data that has been compressed to show each week as a single data point. The difference in detail can be seen with the daily and weekly chart comparison above. 100 data points (or periods) on the daily chart is equal to the last 5 months of the weekly chart, which is shown by the data marked in the rectangle. The more the data is compressed, the longer the time frame possible for displaying the data. If the chart can display 100 data points, a weekly chart will hold 100 weeks (almost 2 years). A daily chart that displays 100 days would represent about 5 months. There are about 20 trading days in a month and about 252 trading days in a year. The choice of data compression and time frame depends on the data available and your trading or investing style.

• Traders usually concentrate on charts made up of daily and intraday data to forecast short-term price movements. The shorter the time frame and the less compressed the data is, the more detail that is available. While long on detail, short-term charts can be volatile and contain a lot of noise. Large sudden price movements, wide high-low ranges and price gaps can affect volatility, which can distort the overall picture.
  
• Investors usually focus on weekly and monthly charts to spot long-term trends and forecast long-term price movements. Because long-term charts (typically 1-4 years) cover a longer time frame with compressed data, price movements do not appear as extreme and there is often less noise.
  
• Others might use a combination of long-term and short-term charts. Long-term charts are good for analyzing the large picture to get a broad perspective of the historical price action. Once the general picture is analyzed, a daily chart can be used to zoom in on the last few months.

Conclusions

Even though many different charting techniques are available, one method is not necessarily better than the other. The data may be the same, but each method will provide its own unique interpretation, with its own benefits and drawbacks. A breakout on the point & figure chart may not occur in unison with a breakout in a candlestick chart. Signals that are available on candlestick charts may not appear on bar charts. How the security's price is displayed, be it a bar chart or candlestick chart, with an arithmetic scale or semi-log scale, is not the most important aspect. After all, the data is the same and price action is price action. When all is said and done, it is the analysis of the price action that separates successful technicians from not-so-successful technicians. The choice of which charting method to use will depend on personal preferences and trading or investing styles. Once you have chosen a particular charting methodology, it is probably best to stick with it and learn how best to read the signals. Switching back and forth may cause confusion and undermine the focus of your analysis. Faulty analysis is rarely caused by the chart. Before blaming your charting method for missing a signal, first look at your analysis.

The keys to successful chart analysis are dedication, focus, and consistency:

• Dedication: Learn the basics of chart analysis, apply your knowledge on a regular basis, and continue your development.
• Focus: Limit the number of charts, indicators and methods you use. Learn how to use them, and learn how to use them well.
• Consistency: Maintain your charts on a regular basis and study them often (daily if possible).

Q: Which kind of chart draws together one closing price to the next closing price over a certain period of time?

 A: simple line chart draws a line from one closing price to the next closing price. When strung together with a line, we can see the general price movement of a currency pair over a period of time.

Q: The bar chart is also called the...

A: Bar charts are also called “OHLC” charts, because they indicate the Open, the High, the Low, and the Close for that particular currency. 

Q: What does the peak of the upper shadow of a candlestick indicate? 

A:  The peak of the upper shadow of a candlestick indicates the high price.