Useful tips for everyday
What kinds of variables are likely to be non-stationary? Data points are often non-stationary or have means, variances, and covariances that change over time. Non-stationary…
How do you find sample size with unknown standard deviation? How to Find a Sample Size Given a Confidence Level and Width (unknown population standard…
What are the three types of factorial designs? Factorial designs may be experimental, nonexperimental, quasi-experimental or mixed. How do you do a fractional factorial design?…
Why is statistical report important? Knowledge of statistics helps a manager to describe the problem, identify and evaluate alternative courses of action, estimate error, monitor…
Is residual standard error the same as R-squared? The residual standard error is the standard deviation of the residuals – Smaller residual standard error means…
Is the residual correlated with the independent variable? Neighboring residuals must not be correlated. In statistics, this is known as autocorrelation. This correlation represents explanatory…
How to use fixed effect and random effects modeling? Using the R software, the fixed effects and random effects modeling approach were applied to an…
Does Mann-Whitney test compare means? But since the Mann-Whitney test analyzes only the ranks, it does not see a substantial difference between the groups. The…
How do you know if an experiment is statistically significant? Start by looking at the left side of your degrees of freedom and find your…
How do you split training data? The simplest way to split the modelling dataset into training and testing sets is to assign 2/3 data points…