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# Statistics and linear algebra for machine learning

## Statistics:

### 1. Descriptive Statistics:

• Mean, Median, Mode: Measures of central tendency help summarize and understand the distribution of data.
• Standard Deviation, Variance: Measures of dispersion provide insights into the spread of data points.

### 2. Inferential Statistics:

• Probability Distributions: Understanding probability distributions is essential for modeling uncertainties in data.
• Hypothesis Testing: Used to make inferences about population parameters based on sample data.

### 3. Statistical Learning:

• Regression Analysis: Modeling the relationship between variables.
• Classification: Assigning labels or categories to data points based on statistical models.

### 4. Sampling Techniques:

• Random Sampling: Ensures representative subsets for training and testing data.
• Bootstrapping: Resampling technique used for estimating the distribution of a statistic.

## Linear Algebra:

### 1. Vectors and Matrices:

• Vectors: Representing data points and features.
• Matrices: Used for transformations, such as feature scaling and data manipulation.

### 2. Matrix Operations:

• Addition, Subtraction, Multiplication: Fundamental operations for manipulating data and parameters.
• Transpose: Flipping rows and columns, often used in calculations.

### 3. Eigenvalues and Eigenvectors:

• Principal Component Analysis (PCA): Dimensionality reduction technique.
• Spectral Clustering: Clustering algorithm based on eigenvectors.

### 4. Matrix Decompositions:

• Singular Value Decomposition (SVD): Used in latent semantic analysis and collaborative filtering.
• LU Decomposition: Solving linear equations efficiently.

### 6. Linear Independence and Rank:

• Determining Rank: Assessing the number of linearly independent columns or rows in a matrix.
• Rank-Nullity Theorem: Essential in understanding the dimensionality of the solution space.