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meTchaikovsky
  • Member for 4 years, 4 months
  • Last seen more than a week ago
544 votes
11 answers
622k views

What is the difference between test set and validation set?

  • 6,959
384 votes
7 answers
368k views

When conducting multiple regression, when should you center your predictor variables & when should you standardize them?

  • 4,251
336 votes
8 answers
131k views

Why is Euclidean distance not a good metric in high dimensions?

  • 3,577
292 votes
8 answers
206k views

Bagging, boosting and stacking in machine learning

  • 3,029
280 votes
6 answers
568k views

What is batch size in neural network?

  • 3,731
276 votes
6 answers
437k views

What does AUC stand for and what is it?

  • 3,139
269 votes
10 answers
154k views

How would you explain covariance to someone who understands only the mean?

  • 13.7k
266 votes
11 answers
181k views

How would you explain Markov Chain Monte Carlo (MCMC) to a layperson?

261 votes
3 answers
26k views

How to know that your machine learning problem is hopeless?

  • 117k
254 votes
15 answers
279k views

What are the differences between Factor Analysis and Principal Component Analysis?

251 votes
7 answers
181k views

How to choose a predictive model after k-fold cross-validation?

  • 4,365
231 votes
8 answers
113k views

Algorithms for automatic model selection

  • 2,460
214 votes
17 answers
211k views

Intuitive explanation for dividing by $n-1$ when calculating standard deviation?

  • 20.3k
204 votes
4 answers
193k views

What does the hidden layer in a neural network compute?

  • 2,177
197 votes
10 answers
211k views

How to deal with perfect separation in logistic regression?

  • 6,751
183 votes
4 answers
45k views

Why do we need sigma-algebras to define probability spaces?

173 votes
2 answers
208k views

A list of cost functions used in neural networks, alongside applications

  • 2,835
166 votes
2 answers
161k views

Deriving the conditional distributions of a multivariate normal distribution

  • 5,869
163 votes
11 answers
126k views

What is the difference between a neural network and a deep neural network, and why do the deep ones work better?

  • 1,841
158 votes
1 answer
162k views

How to reverse PCA and reconstruct original variables from several principal components?

  • 95.5k
144 votes
8 answers
88k views

Why L1 norm for sparse models

  • 1,623
139 votes
9 answers
57k views

Obtaining knowledge from a random forest

133 votes
4 answers
65k views

Nested cross validation for model selection

133 votes
7 answers
100k views

Clustering on the output of t-SNE

  • 12.3k
128 votes
10 answers
71k views

Bias and variance in leave-one-out vs K-fold cross validation

127 votes
6 answers
220k views

How would you explain the difference between correlation and covariance?

  • 5,613
123 votes
4 answers
50k views

Is it possible to have a pair of Gaussian random variables for which the joint distribution is not Gaussian?

  • 2,579
116 votes
4 answers
48k views

Why does the Lasso provide Variable Selection?

  • 1,372
115 votes
21 answers
43k views

What's a real-world example of "overfitting"?

115 votes
7 answers
123k views

Is it necessary to scale the target value in addition to scaling features for regression analysis?

  • 2,433
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