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Covariance

Wednesday March 14th, 2012 Morgan Fardo 0

The covariance between two real random variables X and Y, is defined as the measure of how these two variables vary together. The covariance is […]

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Expected Value

Wednesday March 14th, 2012 Morgan Fardo 0

The expected value of a discrete random variable is the probability-weighted average of all possible values. In other words, each possible value the random variable can assume […]

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Variance

Wednesday March 7th, 2012 Morgan Fardo 0

The variance measures how far a set of numbers is spread out. The variance of a data set is the squared sum of the distance between each number and […]

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Geometric Mean

Monday March 5th, 2012 Morgan Fardo 0

The geometric mean of a set of positive numbers is defined by the “nth root” of the “n”numbers multiplication.     The geometric mean is widely used in financial […]

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Harmonic Mean

Monday March 5th, 2012 Morgan Fardo 0

The harmonic mean of real positive numbers x1,…,xn is definided as the number of numbers divided by the sum of the inverse of each number, […]

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Measures of Central Tendency

Sunday March 4th, 2012 Morgan Fardo 0

Measures of Central Tendency shows  the value around the observations are grouped. The most common measures of central tendency are the mean (aritmetic/harmonic/geometric), the median and […]

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IBOVESPA or IBOV

Monday February 27th, 2012 Morgan Fardo 0

The Bovespa Index is an index of about 50 stocks that are traded on the São Paulo Stock Exchange.

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Share

Sunday February 26th, 2012 Morgan Fardo 0

The share is the smallest fraction that represent company’s capital.

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Frequency Distribution

Saturday February 25th, 2012 Morgan Fardo 0

The frequency distribution is a list of values a variable can take in a sample. Its typically a list, sorted by quantities or classes, which […]