How to Make Money by Jobbing in the Stock Market

Open a brokerage account that lets you buy and sell stocks and bonds. You can opt to work through a traditional brokerage account, where a broker provides personalized service and advice. The fees for a traditional account often make them prohibitive for the frequent buy-and-sell pattern of stock jobbing. Online brokerage accounts, which provide minimal personalized service and advice, provide the advantage of much lower fees for trading, which lends itself to jobbing.
Understand how a stock chart tracks the past performance of a stock in terms of price. Stock charts typically include graphs that show price movement as jagged lines that cover days, weeks or months of past trading. Some charts represent price movements as vertical bars, called candlesticks, that show the top and bottom prices for a given day.
Understand the support and resistance levels of stocks. Some stocks will persistently fall to a particular price, rise to a particular price and then fall back to the original price. These are the support and resistance levels. The support level, at which the price bottoms out, represents the point at which demand picks up and investors begin to buy. The resistance level, at which the price peaks, represents the point at which demand falls off and investors begin to sell the stock.
Choose an appropriate stock to purchase. Stock selection for jobbing requires you to research the market. The right stocks exhibit ongoing price fluctuations but with relatively predictable support and resistance levels. After you find a stock that shows volatility, but within predictable limits, you wait for the stock to reach its support level and then purchase shares. After the stock reaches its resistance level, you sell the stock shares and pocket the difference. To make stock jobbing profitable, you need to select stocks that demonstrate a large enough difference between support and resistance levels that, when you sell, you make enough to pay the fees and taxes but still make a profit.
Pay your taxes. You are responsible for paying short-term capital gains taxes at your current tax rate for profits on stock jobbing. The Internal Revenue Service may require you to pay estimated tax payments on jobbing profits. Consult with your accountant to determine if or when you need to make payments.

How to Calculate Stock Price Volatility

Gather stock price information. You will need at least a month of daily stock price data. However, you will get the best results by using at least six months of data. If you don't know how to do this, go to Yahoo! Finance, input the stock's ticker symbol into 'Get Quotes,' and click on 'Historical Prices.' Copy and paste this information directly into a spreadsheet. Label Column A to represent historical stock price trading dates and Column B to show daily closing stock prices.
Find the average price over the length of time you chose. For example, if you pulled out six months of information, take the average price over 183 days. This can be set up as the AVERAGE function or by taking the sum of all daily prices (Column B) and dividing by 183.
Calculate the difference between the daily price (Column B) and the average over the range of data. If you're using a spreadsheet, create a Column C, which will refer to this difference, by subtracting Column B from the average. Copy and paste this function down the length of the data on your spreadsheet.
Square the difference. Create a Column D into which you put the square of Column C. You do this by multiplying the Column C value by itself. Now find the sum of Column D and divide by your days range (183 days for 6 months of data). This is called the variance.
Take the square root of the variance, using the SQRT function. This result gives the stock's standard deviation for the entire sample of price data. In the investor world, this number represents a measure of stock-price volatility.
Check your results with a historical-volatility calculator. Use the same data referred to in the calculations above. See Resources for a link to an historical-volatility calculator.