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Stock Market Probability Distribution

To make sure it is a proper probability distribution you will want to normalize these empirical probabilities so that the sum of the entire probabilities from all the. We all know that stock market returns are not normally distributed.

The true probability distribution of stock market returns the goal of a trader is to best possibly position himherself to maximize their chances of winning.

Stock market probability distribution. They dont just have one peak in the middle of the distribution as. You might say that the stock market has a 68 percent probability of dropping by 1 to 2 percent or a 95 percent probability that it will drop between 08 to 22 percent. Instead we think of them as having fat tails ie.

The risk reward of each of the butterflies represent the empirical probability that the market is pricing for the underlying to move between the strikes of the butterfly. How probability distributions work perhaps the most common probability distribution is the normal distribution or bell curve although several distributions exist that are commonly used. A z score of 282 means the observed value was 282 standard deviations below the mean the further it is from the mean in either direction the less probable the observation.

We borrow the probability theory mathematical models and apply them in different areas that includes financial markets. To do this it is crucial that you as a trader understand the underlying probability distributions of stock market returns. The more certain you want to be the wider your range is going to be because you have to account for a greater range of data that encompasses a particular level of probability.

Lets start with a simple example. The 282 is a theoretical z score aka. Main stock market probability.

The value below which we expect 0237 of our observations to lie on a normal distribution. Current stock price that we call the spot price is 10 per share. Probability theory started in an attempt to better explain the outcomes in gambling and today it is still being used in casinos.

Extreme events happen more frequently than expected. But if you look at the distribution of stock market returns over different time frames then you will find that returns arent even monomodal ie. How to improve the odds of making better investment decisions.

The normal distribution assesses the odds of a 3 sigma day like this at 0135 which assuming a 252 day trading year predicts a drop this size or greater should occur about once every 3 years of trading. The probability distribution is a statistical calculation that describes the chance that a given variable will fall between or within a specific range on a plotting chart. The odds associated with 8 to 10 sigma events for a normal distribution are truly mind boggling.

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