Difference between revisions of "Principal Component Analysis"
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* Reading on [http://literature.connectmv.com/item/12/cross-validatory-estimation-of-the-number-of-components-in-factor-and-principal-components-models cross validation] | * Reading on [http://literature.connectmv.com/item/12/cross-validatory-estimation-of-the-number-of-components-in-factor-and-principal-components-models cross validation] | ||
== Update == | |||
This illustration should help better explain what I trying to get across in class 2B | |||
[[Image:geometric-interpretation-of-PCA-xhat-residuals.png|700px]] | |||
Revision as of 14:00, 18 September 2011
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Class notes
<pdfreflow> class_date = 16 September 2011 [1.65 Mb] button_label = Create my projector slides! show_page_layout = 1 show_frame_option = 1 pdf_file = lvm-class-2.pdf </pdfreflow>
- Also download these 3 CSV files and bring them on your computer:
- Peas dataset: http://datasets.connectmv.com/info/peas
- Food texture dataset: http://datasets.connectmv.com/info/food-texture
- Food consumption dataset: http://datasets.connectmv.com/info/food-consumption
Class preparation
Class 2 (16 September)
- Reading for class 2
- Linear algebra topics you should be familiar with before class 2:
- matrix multiplication
- that matrix multiplication of a vector by a matrix is a transformation from one coordinate system to another (we will review this in class)
- linear combinations (read the first section of that website: we will review this in class)
- the dot product of 2 vectors, and that they are related by the cosine of the angle between them (see the geometric interpretation section)
Class 3 (23 September)
- Least squares:
- what is the objective function of least squares
- how to calculate the two regression coefficients \(b_0\) and \(b_1\) for \(y = b_0 + b_1x + e\)
- understand that the residuals in least squares are orthogonal to \(x\)
- Some optimization theory:
- how an optimization problem is written with equality constraints
- the Lagrange multiplier principle for solving simple, equality constrained optimization problems
- Reading on cross validation
Update
This illustration should help better explain what I trying to get across in class 2B
