#statistics
- 25 Jul 2024 · Study
Probability and Statistics · Simple linear regression
Fitting y = a + bx by least squares, reading slope and intercept, R², residuals, and the bridge to machine learning.
- 18 Jul 2024 · Study
Probability and Statistics · Correlation
Covariance, Pearson vs Spearman correlation, what r does and doesn't capture, and why correlation is not causation.
- 11 Jul 2024 · Study
Probability and Statistics · t-test and chi-square
One-sample, two-sample (Welch) and paired t-tests, and the chi-square test of independence for categorical data.
- 5 Jul 2024 · Study
Probability and Statistics · Hypothesis tests
The logic of a hypothesis test: null and alternative, test statistic, p-value, significance level, and the two types of error.
- 28 Jun 2024 · Study
Probability and Statistics · Point and interval estimation
Estimators and their bias, standard error, and building and interpreting 95% confidence intervals with the t distribution.
- 21 Jun 2024 · Study
Probability and Statistics · Sampling
Population vs sample, simple random vs stratified sampling, sampling bias, and the bootstrap for estimating uncertainty.
- 17 Jun 2024 · Study
Probability and Statistics · Central Limit Theorem
Why sample means look normal even when the data doesn't, the σ/√n standard error, and a simulation from a skewed distribution.
- 1 May 2024 · Study
Probability and Statistics · Descriptive statistics
Summarising data with centre (mean, median, mode) and spread (variance, standard deviation, IQR), and why the median resists outliers.