Useful tips for everyday
What value of k in KNN method will give the best accuracy? The optimal K value usually found is the square root of N, where…
How do you find the variance between two samples? Definition of Sample Variance Step 1: Calculate the mean (the average weight). Step 2: Subtract the…
What is the difference between a weighted and unweighted sample? The unweighted sample size is in fact the size of the only sample selected. The…
What is the difference between an independent and paired t-test? Paired-samples t tests compare scores on two different variables but for the same group of…
Is a random sample independent? Summary. A random sample is a sequence of independent, identically distributed (IID) random variables. The term random sample is ubiquitous…
What do log returns show? So log return is the non-discrete version, so continuous, meaning it answers what the ending value would be if the…
What is the standard deviation of a dichotomous variable? So, since the mean of a dichotomous variable is the percent who were coded 1 (as…
What is the purpose of the law of large numbers? The law of large numbers states that an observed sample average from a large sample…
What is a superscript asterisk? The asterisk , also called a “star,” is used for a number of different purposed in mathematics. The most common…
What is cross entropy cost function? Cross-entropy is a measure from the field of information theory, building upon entropy and generally calculating the difference between…