Select Page

## Measures of Dispersion

Also called “measure of variability or spread” range – difference between the highest and lowest values + often both extremes are reported with it interquartile range – alternative measure, less influenced by extreme values = range of the...

## Measures of central tendency

the mean – arithmetic mean or average = sum(x1..xn) / n appropriate for interval and ratio data in physical meaning represents point of balance the median – middle value of a data set when values are in ASC or DESC order mathematically defined as (n+1)/2th...

## Probability – basics

Probability generaly refers to an event whose outcome is unknown – if we would know the outcome we do not need to check probability. Probability tells us how often some outcome is likely to occur when an experiment is repeated. Conditional probability –...

## Types of data

nominal data – numbers are use as substitute for names or labels and do not have meaning as number – typicaly “enumerated type” in database, in special case “binary data” ordinal data – data has some meaningful order, higher...