Search Results

12 results for “spread”

Formulae (12)

\sigma^2 = \frac{1}{n}\sum_{i=1}^{n}(x_i - \bar{x})^2

Average squared deviation from the mean.

\sigma = \sqrt{\frac{1}{n}\sum_{i=1}^{n}(x_i-\bar{x})^2}

Square root of the variance; typical spread.

R = x_{max} - x_{min}

The difference between the largest and smallest values.

IQR = Q_3 - Q_1

The spread of the middle 50% of the data.

CV = \frac{\sigma}{\bar{x}}\times 100\%

Relative variability as a percentage of the mean.

R = x_{max} - x_{min}

Difference between the largest and smallest values.

IQR = Q_3 - Q_1

Spread of the middle 50% of the data.

CV = \frac{\sigma}{\mu}\times 100

Relative variability as a percentage of the mean.

s^2 = \frac{1}{n-1}\sum(x_i-\bar{x})^2

Unbiased estimate of population variance.

Var(X) = E[X^2] - (E[X])^2

Measures the spread of a random variable around its mean.

Spread = Ask - Bid

The gap between the price to buy and to sell a currency — the dealer’s markup.

Spread\% = \dfrac{Ask - Bid}{Ask}\times 100\%

The bid-ask spread expressed as a percentage of the ask price.