# Blog

### SKEWNESS AND KURTOSIS

Kurtosis and skewness are measures of asymmetry that describe properties such as the shape and asymmetry of the distribution under analysis. They provide us with information on how the values of the variables deviate when compared to the mean value.

### Quantiles, quartiles, percentiles (measures of location)

We use quantiles to determine the position of a given value compared to others in a group or population. Let's say you have received your matriculation exam results in mathematics. Would you like to find out if your score is high compared to the results of the other people writing the baccalaureate…

### Pearson's chi-square independence test

The chi-square test of independence is one of the most common statistical tests. It is used to test whether there is a statistically significant relationship between two qualitative variables.

### Student T-tests

The Student's t-test group is used to compare two groups of results, measured by the arithmetic mean, against each other.

### From variance to the method of least squares

The mean is one of the most popular and widely used statistical measures. By itself, it is not an exhaustive indicator and only allows for the determination of the central tendency of the variable under analysis.

### The power of a test

The power of a test is the probability of detecting a statistically significant effect when one actually occurs in the population under study.

### Customer Satisfaction Index (CSI)

The Customer Satisfaction Index (CSI), or Consumer Satisfaction Index, is a method used in marketing to assess customer satisfaction with the products or services provided by a company.

### Customer Effort Score (CES)

The Customer Effort Score (CES) is, along with the Net Promoter Score (NPS) and Customer Satisfaction (CSAT), one of the main indicators related to customer satisfaction.

### Factor analysis

The aim of factor analysis is to explain as much of the variability as possible with as few variables as possible.

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