Useful tips for everyday
What is the difference between Proc Lifetest and proc Phreg? PROC LIFETEST is a nonparametric procedure for estimating the dis- tribution of survival time and…
How do you find the beginning value for an outlier? Multiplying the interquartile range (IQR) by 1.5 will give us a way to determine whether…
What is weka correlation coefficient? In WEKA, the correlation coefficient between 1 and 0, but according to wikipedia http://en.wikipedia.org/wiki/Correlation_coefficient, it’s between -1 and 1, while…
When does a data point have a Dirichlet distribution? This means that if a data point has either a categorical or multinomial distribution, and the…
Is probability objective or subjective? Objective probability is the probability an event will occur based on an analysis in which each measure is based on…
How do you calculate standard deviation from two standard deviations? Step 1: Find the mean. Step 2: Subtract the mean from each score. Step 3:…
How to find which Class A histogram belongs to? I have 4 classes and I generate 4 histograms (h1, h2, h3 and h4) for each…
How do you find the t-statistic in an event study? The t-statistic is estimated dividing the average event-period abnormal return ( ) by its contemporaneous…
Does Wilcoxon test use median? Since the Wilcoxon Rank Sum Test does not assume known distributions, it does not deal with parameters, and therefore we…
How do you explain reverse causality? Reverse causation occurs when you believe that X causes Y, but in reality Y actually causes X. This is…