# Questions tagged [projection]

For on-topic questions involving the mathematical concept projection, a linear transformation $P$ such that $P=P^2$. Please include also a more statistical methods tag. For purely mathematical questions about projections it is better to ask on math SE https://math.stackexchange.com/

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### Method of alternating projections for linear fixed effects models [closed]

The standard fixed effects model (in econometrics, mostly) is $$y = \mathbf{X\beta} + \mathbf{D\alpha} + \epsilon$$ where $\mathbf{D}$ is a set of factors, potentially with thousands of levels. ...
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### Orthogonal and stationary basis of projection

Consider a set of $p$ stationary correlated time signals of identical duration $T$. I would like to de-correlate them by projection on an orthogonal basis but preserving stationarity. Without the ...
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### Can I Use The Same Principal Components Of One Dataset To Graph Another Dataset In R?

I have two matrices of equal dimensions $(m \times n)$. If it helps, one matrix is the raw data, while the other is transformed. I've plotted PC1 vs PC2 for both datasets individually, but then I ...
Consider the primal SVM problem: $$\frac12||w||^2 +\frac Cm \sum_{i=1}^m \max(0,1-y_iw\cdot x_i)$$ We want to find a solution with a bounded norm, by using SGD with a projection onto the convex set:...