All Questions
Tagged with statistics machine-learning
660
questions
2
votes
1
answer
567
views
Simple Least Squares Regression?
I have a vector X of 50 real numbers and a vector Y of 50 real numbers.
I want to model them as
y = ax + b
How do I determine a and b such that it minimizes the ...
- 2,660
0
votes
1
answer
132
views
Regression on Linear Model?
I have 50 or so training examples involving a set of 200 or so real numbers (x1,x2,...,x200) (normalized to a 0 mean and std dev 1), and a single output real (y) in the range 0.0..1.0. I want to fit ...
- 2,660
5
votes
2
answers
1k
views
How did Target figure out a teen girl was pregnant before her father did?
First of all I do not have a mathematics degree only a B.S. in finance so please take that into account when writing an answer. Generally what type of mathematics is involved here? And specifically ...
- 79
0
votes
2
answers
108
views
preliminary evaluation for forecasting models
Suppose I would like to use a method for data prediction, and that I have some empirical data (i.e., sequence of samples of the form [time, value]). Would it be possible to know in advance, based on ...
- 1,511
2
votes
1
answer
261
views
How does the backward/forward algorithm work if there is no end?
I'm using Jason Eisner's spreadsheet to understand HMM more better. There's a box at the top that have a transition matrix. I see the Cold day and Hot day options, but don't understand why there's a ...
- 419
4
votes
2
answers
798
views
How to generate and use random trees?
I have the assignment to implement a random tree classifier in MATLAB.
The lecture says:
...
- 141
17
votes
2
answers
2k
views
What is the relationship between the Boltzmann distribution and information theory?
I'm reading a paper on Boltzmann machines (a type of neural network in Machine Learning), and it mentions that "The Boltzmann distribution has some beautiful mathematical properties and it is ...
- 1,103
1
vote
1
answer
4k
views
Maximum Likelihood Estimator for Multivariate Bernoulli
I am working on deriving Naive Bayes for document classification.
Each document is represented by a binary vector $x^i$ where $i=1,..,N$ for N documents. In this vector a cell is set to 1 if that ...
- 16.2k
0
votes
1
answer
304
views
dependency between regression coefficients and probability distribution
let's consider regression problem. Given set of training data $\{(x_i,y_i)\}_{i=1}^N$, $x_i \in \mathbb{R}^n$ and $y_i \in \mathbb{R}$, find prediction function $y = f(x)$, e.g. in RBF regression case ...
- 290
3
votes
1
answer
229
views
Help needed on method to use for anomaly detection in Computer Science
I think people here could guide me in solving a problem related to anomaly detection. The term anomaly here refers to some undesired event occurring in the system like a virus infection.
I could get ...
- 358