THE POWER OF A TEST

THE POWER OF A TEST

By RAFAŁ WAŚKO (Predictive Solutions) The power of a test is the probability of detecting a statistically significant effect when one actually occurs in the population under study. Without adequate test power, we may make a type II error, meaning that the analyst will...

SKEWNESS AND KURTOSIS

SKEWNESS AND KURTOSIS

By WIKTORIA KORYGA (Predictive Solutions) Kurtosis and skewness are measures of asymmetry that describe such properties as the shape and asymmetry of the distribution under analysis. They provide us with information on how the values of the variables deviate when...

STUDENT T-TESTS

STUDENT T-TESTS

By RAFAŁ WAŚKO (Predictive Solutions) The Student's t-test group is used to compare two groups of results, measured by the arithmetic mean, against each other. WHAT DO THE T-TESTS TEST? These types of tests will be useful to us when we want to determine whether the...

Customer Effort Score (NPS)

Customer Effort Score (NPS)

By RAFAŁ WAŚKO (Predictive Solutions) Customer Effort Score (CES), along with Net Promoter Score (NPS), and Customer Satisfaction (CSAT), is one of the key indicators related to clients' satisfaction. All these three indicators are intended to understand the moods of...

Linear Regression

Linear Regression

By RAFAŁ WAŚKO (Predictive Solutions) The main idea of regression is to predict the value of a dependent variable (otherwise known as predictor, explained variable) based on one or more independent variables (called predictors, explanatory variables). The simplest...

Net Promoter Score (NPS)

Net Promoter Score (NPS)

By RAFAŁ WAŚKO (Predictive Solutions) Researching customer satisfaction and loyalty is currently an inseparable part of running a business that is focused on developing and building their advantage over competitors. Currently, the standard in this respect is the NPS...

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