Useful tips for everyday
How much of variation in Y is explained by X? in the values of the dependent variable that can be explained by the variation in…
What is the purpose of a time series? A time series is simply a series of data points ordered in time. In a time series,…
Can Poisson be used for non count data? A Poisson distribution works well, even if it’s not realy count data anymore. Does Poisson have to…
Which is better an ACF or PACF plot? The ACF shows a gradually decreasing trend while the PACF cuts immediately after one lag. Thus, the…
What are VaR limits? Method 1: VaR limits specify the maximum amount of VaR that each desk can cause. The practical starting point for setting…
How are regular vines used in Dependence Modeling? Combined with bivariate copulas, regular vines have proven to be a flexible tool in high-dimensional dependence modeling.…
Why is transforming data important? Data is transformed to make it better-organized. Transformed data may be easier for both humans and computers to use. Properly…
Which loss functions are convex? Fortunately, hinge loss, logistic loss and square loss are all convex functions. Convexity ensures global minimum and it’s computationally appleaing.…
How to get variance from random effects models? Since this variance reflect the “average” random effects variance for mixed models, it is also appropriate for…
What is price volatility in agricultural markets? As unpredictable changes, or “shocks”, surpass a certain Recent bouts of extreme price volatility in global agricultural markets…