Useful tips for everyday
Is the standardized test statistic the p value? When using a standard normal distribution (i.e., z distribution), the test statistic is the standardized value that…
What is predicted residual sum of squares? In statistics, the predicted residual error sum of squares (PRESS) statistic is a form of cross-validation used in…
Is the Mann Whitney test the same as the t test? I mean t-test and Mann-Whitney test were performed on same variables separately and found…
What is the difference between quartiles and quantiles? The word “quantile” comes from the word quantity. Quartiles are also quantiles; they divide the distribution into…
Is Poisson distribution Memoryless? On the other hand, a Poisson process is a memoryless stochastic point process; that an event has just occurred or that…
Are there any missing predictors in the regression model? That is, there are no missing, redundant or extraneous predictors in the model. Of course, this…
How do you handle frequencies option in Analyse? To run the Frequencies procedure, click Analyze > Descriptive Statistics > Frequencies. A Variable(s): The variables to…
Why do we use samples instead of analyzing the entire population? Usually, a sample of the population is used in research, as it is easier…
What does significant mean in multiple regression? If your regression model contains independent variables that are statistically significant, a reasonably high R-squared value makes sense.…
What is sigma squared over N? Variance = average squared deviation of N individuals from the mean. By definition, [read as, “sigma squared”] Calculation of…