Useful tips for everyday
What is the autocorrelation of the first lag? In theory, the first lag autocorrelation θ 1 / ( 1 + θ 1 2) = .7…
Does data have to fit in-memory to use Spark? Does my data need to fit in memory to use Spark? No. Spark’s operators spill data…
How do I know which ARIMA model is better? The best ARIMA model have been selected by using the criteria such as AIC, AICc, SIC,…
How do you find the mean of a normal distribution given the standard deviation? The mean for the standard normal distribution is zero, and the…
Is breusch-Pagan test reliable? Moreover, in comparison with the wild bootstrap “version” of the original Breusch–Pagan test (Godfrey and Yamagata, 2011) our experiments indicate that…
Why is R-squared equal to correlation? The R-squared value, denoted by R 2, is the square of the correlation. It measures the proportion of variation…
What is significance level in backward elimination? The first step in backward elimination is pretty simple, you just select a significance level, or select the…
How do you find the joint likelihood function? To obtain the likelihood function L(x,г), replace each variable ⇠i with the numerical value of the corresponding…
What is correlated error? A correlated error is one where the magnitude of the error at the user receiver can be calculated from the magnitude…
What is independent variable of time series? The forecast variable y is sometimes also called the regressand, dependent or explained variable. The predictor variables x…