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conditions Trader Alexander Elder explained it best; he wrote that oversold and overbought are like the hot and cold readings on a thermometer The same temperature has different meanings in summer and winter Therefore, during bull markets or bear markets, these levels might adjust upward or downward, respectively Another drawback: Depending on the settings you choose, RSI could go from generating multiple signals to moving between 30 and 70 without giving one significant signal To solve this problem, start with the default 14-day RSI, but experiment with shorter (9-day) and longer (25-day) time frames to see how RSI reacts Eventually you will find a setting that works for you For Short-Term Traders One signal some traders look for is divergence For example, if the market is making new highs but RSI is moving down, this is a significant bearish signal Sometimes, the market may reverse, following RSI lower Conversely, if the market is making new lows but RSI is moving up, it s possible the market will follow RSI higher (Caution: Several traders claim that RSI divergences work less than 50 percent of the time, so tread carefully) Nevertheless, by looking for divergences on long-term charts, it s possible you ll identify major tops and bottoms You should know that RSI, although a fairly good divergence indicator, is a bit slower to react than the next oscillator we ll discuss, Stochastics There are many other signals we didn t discuss here, such as failure swings and centerline crossovers Learning how to properly interpret RSI signals takes a lot more study and experience than we have room for in this book Although RSI comes with a default of a 14-day period, many traders experiment with different settings A 9-day period is popular with many short-term traders, and a 25-day period, recommended by Wilder, is favored by those who like to trade for the longer term If you do use a shorter time period like the 9-day, or even shorter, it s possible you ll get a lot of false signals.

The Column Null Ratio profile is one of the exceptions in that it works with any type of data, including binary information. It reports the number of null values in a particular column. For example, profiling a column that is believed to always have a value because of rules enforced in the user interface may reveal that the rule isn t always enforced.

You can also launch Excel if it s not running by telling it to open a workbook or to create a new workbook For example, the following snippet launches Excel if it s not running, as the make new workbook command requires Excel to be open:

The Column Pattern profile only works on string columns and returns a list of regular expressions that match the values in the column. It may return multiple regular expressions, along with the frequency that the pattern applies to the data. For example, using this profile against a telephone number column might return the values \d{10} (for numbers with no dashes 5555555555), \d{3}-\d{3}-\d{4} (for numbers with dashes 555-555-5555), and \d{3})\d{3}-\d{4} (for numbers with parentheses (555)555-5555).

If you liked RSI, you ll love Stochastics, although it can be rowdy at times Stochastics is a favorite with experienced traders, who like its precise signals You should know that RSI and Stochastics can give almost identical signals, so you may not want to use both Meanwhile, if RSI seemed too tame for you, then step right up: you re going on a Stochastics roller-coaster ride

The Column Value Distribution profile works on string, date, and numeric types (including money, decimal, float, real, and numeric). It returns the count of distinct

To quit Excel, use the quit command:

values in a column, the list of the distinct values in a column, and the number of times each item is used. For example, this could be used to profile the distribution of product sales by product category by referencing a table of product sales that contains a column with product categories.

Name: Stochastics Where to find: wwwstockchartscom or any chart program Default settings: 14 (%K), 3 (%D) Time period: Daily or weekly Favorite market: Choppy The Lighter Side: Stochastics, originally nicknamed The Drama Queen by author and trader Toni Turner, is even more excitable than RSI You ll need a firm and experienced hand to keep this duckling under control

Before agreeing to quit, Excel prompts you to save any unsaved changes to workbooks You ll see how to handle unsaved changes later in this chapter