2
votes
0answers
53 views

A* vs D* vs Dijkstra [closed]

I understand the basis of A* as being a derivative of Dijkstra, however, I recently found out about D*. From wikipedia, I can understand the algorithm. What I do not understand is why I would use D* ...
1
vote
0answers
26 views

Polynomial regression - differences between algorithms

I know that I can find a polynomial regression's coefficients doing $(X'X)^{-1}X'y$ (where $X'$ is the transpose). This is a way of finding them; now, there is (as far as I know) at least one other ...
0
votes
1answer
82 views

Jacobian in Levenberg-Marquardt for 4-Parameter equation

I am trying to fully understand how I can use Levenberg-Marquardt to minimise a 4 parameter equation. There are lots of fancy programs to do this but the documentation about the mathematics is ...
1
vote
0answers
104 views

Multivariate regression model

Supposing I have a graph involving time (x axis time in seconds) and log of nubers of bacteria: I would like to adjust a model given by a formula involving 5 coefficients like: $Number = Log\left ...
0
votes
1answer
59 views

Find local min and local max from dataset

I have a collection of data consists of TIME and TEMPERATURE as follow: (time1, temp1), (time2, temp2), (time3, temp3), ... (time-n temp-n). I cannot come up with a good computer algorithm to ...
2
votes
1answer
63 views

Biased linear regression

I have a set $S$ of coordinates $(x,y)$, and am estimating $f(x) = ax + b$ where $a > 0$. I also happen to know that $\forall x,y((x,y) \in S \implies y < f(x))$. The question is how I can ...
2
votes
0answers
128 views

Effective model for calculating momentum or growth rate for a time series

I have a series of numbers tracking the performance of an entity on any given day. It's nothing but a simple integer for each date. For example, here's a series for Entity "X" ...
2
votes
0answers
331 views

Logistic regression algorithm in Casio and Texas Instruments calculators

When using logistic regression on a Casio or Texas Instruments calculator, the output is of the form $$f(x) = \frac{c}{1+ae^{-bx}} $$ The problem I have (when teaching in a class where both types of ...
8
votes
1answer
4k views

Computational complexity of least square regression operation

In a least square regression algorithm, I have to do the following operations to compute regression coefficients: Matrix multiplication, complexity: $O(C^2N)$ Matrix inversion, complexity: ...
10
votes
2answers
3k views

Finding the intersection point of many lines in 3D (point closest to all lines)

I have many lines (let's say 4) which are supposed to be intersected. (Please consider lines are represented as a pair of points). I want to find the point in space which minimizes the sum of the ...
7
votes
1answer
2k views

easy to implement method to fit a power function (regression)

I want to fit to a dataset a power function ($y=Ax^B$). What is the best and easiest method to do this. I need the $A$ and $B$ parameters too. I'm using in general financial data in my project, which ...