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544 votes
11 answers
622k views

What is the difference between test set and validation set?

  • 6,959
481 votes
20 answers
169k views

The Two Cultures: statistics vs. machine learning?

  • 12k
248 votes
46 answers
26k views

What are common statistical sins?

231 votes
8 answers
113k views

Algorithms for automatic model selection

  • 2,460
207 votes
8 answers
463k views

In linear regression, when is it appropriate to use the log of an independent variable instead of the actual values?

  • 2,221
180 votes
78 answers
248k views

Statistics Jokes

  • 4,899
109 votes
4 answers
114k views

Difference between standard error and standard deviation

  • 1,243
99 votes
2 answers
75k views

Solving for regression parameters in closed-form vs gradient descent

  • 3,555
89 votes
4 answers
191k views

How to produce a pretty plot of the results of k-means cluster analysis?

  • 3,525
62 votes
12 answers
19k views

Software needed to scrape data from graph [closed]

59 votes
6 answers
19k views

Alternatives to logistic regression in R

  • 20.3k
59 votes
12 answers
14k views

Resources for learning Markov chain and hidden Markov models

  • 121
57 votes
7 answers
125k views

Is it a good practice to always scale/normalize data for machine learning? [duplicate]

53 votes
3 answers
149k views

What are the values p, d, q, in ARIMA?

  • 609
53 votes
5 answers
53k views

What is the difference between the forward-backward and Viterbi algorithms?

  • 6,187
52 votes
4 answers
98k views

What is difference-in-differences?

44 votes
1 answer
20k views

What is the difference between conditional and unconditional quantile regression?

  • 946
41 votes
3 answers
42k views

How is Naive Bayes a Linear Classifier?

  • 799
40 votes
6 answers
135k views

Assumptions of linear models and what to do if the residuals are not normally distributed

  • 745
39 votes
8 answers
14k views

Random walk on the edges of a cube

36 votes
3 answers
68k views

How to fit an ARIMAX-model with R?

  • 1,430
31 votes
2 answers
34k views

Supervised learning, unsupervised learning and reinforcement learning: Workflow basics

27 votes
4 answers
182k views

Detecting outliers using standard deviations

  • 1,045
27 votes
2 answers
12k views

Random forests for multivariate regression

  • 371
23 votes
1 answer
48k views

How to setup xreg argument in auto.arima() in R? [closed]

  • 239
22 votes
6 answers
21k views

Graph theory -- analysis and visualization

  • 2,771
22 votes
1 answer
817 views

Prediction interval based on cross-validation (CV)

  • 3,089
21 votes
3 answers
24k views

How to use DLM with Kalman filtering for forecasting

  • 311
20 votes
2 answers
18k views

stochastic vs deterministic trend/seasonality in time series forecasting

  • 7,459
20 votes
2 answers
6k views

How to predict when the next event occurs, based on times of previous events?

  • 301
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