Useful tips for everyday
When to do feature selection before or after split? The contradicting answer is that, if only the Training Set chosen from the whole dataset is…
How can we compare survival between two groups? To compare survival between groups we can use the log rank test. The null hypothesis is that…
What is the phase difference between the voltage and the current for an inductor? An inductor is simply a coil of wire (often wrapped around…
Why do I need a Schottky diode? Schottky diodes are used for their low turn-on voltage, fast recovery time and low-loss energy at higher frequencies.…
Does ORM use SQL? An ORM library is a completely ordinary library written in your language of choice that encapsulates the code needed to manipulate…
How can I use cursor inside cursor in SQL? The trick to declaring a cursor within a cursor is that you need to continue to…
When to use oversampling and undersampling in data analysis? Undersampling is employed much less frequently. Overabundance of already collected data became an issue only in…
How much is spent globally on education? Analysis for this report estimates annual spending on education at US$4.7 trillion worldwide. What country spends most on…
How do I run Apex class in user mode? Use the inherited sharing keyword on an Apex class to run the class in the sharing…
Why is scaling important for PCA? Scaling (what I would call centering and scaling) is very important for PCA because of the way that the…