the cyclist

Alden Scientific

Last seen: Today | Active since 2011

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Head of Modeling and Statistics at Alden Scientific. Obsessive runner. Professional Interests: Predictive modeling, statistics. (I don't respond to email via author page, but will usually look at a question if you send me a link to it.)

Programming Languages:
Python, R, MATLAB, SQL
Spoken Languages:
English
Pronouns:
He/him

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49 Questions
5,313 Answers

ANSWER ACCEPTANCE
73.47%

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Answered
Would kfold loss values vary if cross validation is performed after model training?
The predictions will be identical, as long as you use the same fold assignments: % Set seed, for reproducibility rng default ...

3 hours ago | 0

| accepted

Answered
How to create a pdf from the histogram
You can use the histogram function to create and plot a histogram. You can use the ksdensity function to estimate a non-paramet...

5 days ago | 1

| accepted

Answered
More unexpected behavior multiplying an array with a double
Using the simpler example that @Stephen23, posted S(1).x = pi; S(2).x = sqrt(2); S.x Note that S.x is not a double array. ...

12 days ago | 1

| accepted

Answered
How does one obtain the covariance matrix for the fixed effects from fitting a mixed effect model using fitlme or fitlmematrix?
A LinearMixedModel object lme has a CoefficientCovariance property, which you can obtain with lme.CoefficientCovariance This i...

21 days ago | 0

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Answered
Hyperparameter optimization fitrnet not working
Per the documentation for fitrnet ... "You can use an array ResponseVarName to specify multiple response variables. (since R202...

26 days ago | 0

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Answered
Shapley based feature selection
The Shapley values don't require the class labels (i.e. the actual responses) to determine feature importance. The Shapley valu...

2 months ago | 1

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Solved

Project Euler: Problem 4, Palindromic numbers
A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 ...

2 months ago

Solved

Project Euler: Problem 3, Largest prime factor
The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number being input, input might be ui...

2 months ago

Solved

Solve a System of Linear Equations
Example: If a system of linear equations in x₁ and x₂ is: 2x₁ + x₂ = 2 x₁ - 4 x₂ = 3 Then the coefficient matrix (A) is: 2 ...

2 months ago

Solved

Verify Law of Large Numbers
If a large number of fair N-sided dice are rolled, the average of the simulated rolls is likely to be close to the mean of 1,2,....

2 months ago

Solved

Word Counting and Indexing
You are given a list of strings, each being a list of words divided by spaces. Break the strings into words, then return a maste...

2 months ago

Solved

Magic is simple (for beginners)
Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

2 months ago

Solved

Rotate Matrix @180 degree
Rotate Matrix @180 degree Example A=[8 1 6; 3 5 7; 4 9 2], then answer would be [2 9 4;...

2 months ago

Solved

Converts numbers into characters
Converts numbers into characters

2 months ago

Solved

Find the max element of the array
Find the max element of the array

2 months ago

Solved

Square root
Given x (a matrix), give back another matrix, where all the elements are the square roots of x's elements.

2 months ago

Solved

Calculate the average value of the elements in the array
Calculate the average value of the elements in the array

2 months ago

Solved

to the 2 all elements
to the 2 all elements

2 months ago

Solved

the average value of the elements
Calculate the average value of the elements in the array

2 months ago

Solved

Double all elements in the array
Duplicate all elements in the array

2 months ago

Solved

calculate the length of matrix
input 1 array, calculate the length

2 months ago

Solved

Draw a '0' in a one matrix!

2 months ago

Solved

Length of the hypotenuse
Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<https://i.imgu...

2 months ago

Solved

Maximum value in a matrix
Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

2 months ago

Solved

Return area of square
Side of square=input=a Area=output=b

2 months ago

Solved

Convert from Fahrenheit to Celsius
Given an input vector F containing temperature values in Fahrenheit, return an output vector C that contains the values in Celsi...

2 months ago

Solved

Calculate Amount of Cake Frosting
Given two input variables r and h, which stand for the radius and height of a cake, calculate the surface area of the cake you n...

2 months ago

Solved

Find the Oldest Person in a Room
Given two input vectors: * |name| - user last names * |age| - corresponding age of the person Return the name of the ol...

2 months ago

Answered
Preserving More Decimal Places When Importing Excel Files with readtable in MATLAB
All decimal places are retained for me ... % Change the format format long % Read the file r = readtable("Lab.xlsx"); % H...

4 months ago | 0

Answered
How to get MPE (Mean Percentage Error) with plsregress
The documentation doesn't seem to indicate any way to change the metric that is optimized. (This is unsurprising to me.) I can ...

4 months ago | 0

| accepted