Useful tips for everyday
How are seasonal ARIMA models used to predict quarterly data? For quarterly data, S = 4 time periods per year. In a seasonal ARIMA model,…
What is the main difference between t test and chi-square test? The t-test allows you to say either “we can reject the null hypothesis of…
What is the probability that in 3 rolls of a pair of six-sided dice exactly one total of 7 is rolled? With 2, 6-sided dice,…
How do you calculate kriging weights? In Kriging, however, the weight factors are calculated by finding the semi-variogram values for all distances between input points…
What are the reasons that respondents are unwilling to answer a specific question? There are usually four key reasons why respondents sometimes don’t answer questions…
How is a prediction probabilistic in a Gaussian process? The prediction interpolates the observations (at least for regular kernels). The prediction is probabilistic (Gaussian) so…
How is factor analysis different from multiple regression and discriminant analysis? The main difference between these two techniques is that regression analysis deals with a…
Where does FAQ go? Most companies will provide a link to the FAQ page in their website’s main navigation bar, so no matter where they…
How do you log transform a target variable? and to solve this apply log transformation on target variable when it has skewed distribution. That being…
What does control limit mean? Control limits are the horizontal lines in a control chart that delineate the upper and lower limits of the acceptable…