“Well asset prices follow a lognormal distribution, which is skewed to the right because asset prices are non-negative. Hence they are positively skewed! Most good stocks are positively skewed. “
Let’s revise a-bit with Positive Skewness –
In probability theory, a log-normal (or lognormal) distribution is a continuous probability distribution of a random variable whose logarithm is normally distributed. Thus, if the random variable X is log-normally distributed, then Y = Log (X) has a normal distribution.
A random variable which is log-normally distributed takes only positive real values as Log (X) cannot return a negative value. The distribution is occasionally referred to as the Galton distribution.
Stock markets returns are defined by Log (T/P) and hence follow a log-normal distribution.
It’s more realistic than normal distribution hence but we assume a normal distribution in our models to make our life easier.
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