Useful tips for everyday
What is the corrected item total correlation? The corrected item-total correlation is used to express the coherence between an item and the other items in…
What is the area within one standard deviation? 68% 68% of the area is within one standard deviation (20) of the mean (100). The normal…
How do you effectively administer a survey questionnaire? Use short, direct sentences with simple vocabulary. Place non-threatening and interesting survey questions first. It will encourage…
What are the sum rule and product rule of probability? The sum rule is for finding the probability of either of two events that cannot…
What are the issues in k-means clustering? k-means has trouble clustering data where clusters are of varying sizes and density. To cluster such data, you…
When does omitting a variable bias a regression? Omitted Variable Bias. As discussed in Visual Regression, omitting a variable from a regression model can bias…
What is a forced choice paradigm? In forced choice, the subject is presented with a number of spatial or temporal alternatives in each trial in…
How are data transformations used to improve correlation? In such cases, it is often possible to “transform” the raw data to make it more linear.…
How do you interpret permutations? If the order doesn’t matter then we have a combination, if the order do matter then we have a permutation.…
What is the symbol for multiple regression? In R, when we make regression models using lm() , we use the tilde symbol y ~ x1…