Questions tagged [statistics]
For questions that relate to probability or measurements, either outputting or parsing.
35
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Sniff out biased random permutations
The brilliant engineers at <enter company you love to hate> have struck again. This time they've "revolutionised" the generation of random permutations. "Every great invention is ...
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votes
12
answers
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Repeat average
Background
It was a normal presentation that I were in as a audience, until the presenter gave a math problem about repeat taking 2 number out of a list a replacing them with average, claiming that ...
- 1,367
15
votes
17
answers
790
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Square chunk my matrix
Your challenge is to write a function/program that takes a matrix of integers m and a number n as input and:
Splits m into n by n chunks
Replaces each chunk with the most common value in that chunk (...
- 27.6k
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votes
9
answers
3k
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Approximate when you are going to die
A mortality table or life table is an actuarial tool that gives the probability that a person aged \$A\$ years will die in the next year, and is used to help calculate the premiums for life insurance, ...
- 26.7k
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22
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Mode length of a sentence
The task is simple. You are given a string with alphabetical words (say "Hello world, this are tests"). You have to return the mode of the lengths of ...
- 2,850
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answers
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Average Two Letters
Introduction
Every letter in the English alphabet can be represented as an ASCII code. For example, a is 97, and ...
- 2,035
9
votes
11
answers
754
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Olympic game scoring [closed]
The challenge is to write a golf-code program that, given n positive real numbers from 0 to 10 (format x.y, y only can be 0 or 5: 0, 0.5, 1, 1.5, 2, 2.5 … 9.5 and 10), discard the lowest and highest ...
- 169
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Fivenum and a little bit
(a paradox, a paradox, a most ingenious paradox)
This is the first part of a multipart series inspired by different R functions.
The Task
Given a dataset \$D\$ of positive integers, I need you to ...
- 26.7k
3
votes
5
answers
2k
views
Average Idle-Dice Rolling
So I ran into this progressive/idle game cleverly called Idle Dice. Has a variety of random effects applied to a pretty typical progression formula game. Warning, time sink! Play at your own risk.
...
14
votes
26
answers
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Standardize the Samples (Compute the z-Score)
Given a list of floating point numbers, standardize it.
Details
A list \$x_1,x_2,\ldots,x_n\$ is standardized if the mean of all values is 0, and the standard deviation is 1. One way to compute this ...
- 43k
7
votes
4
answers
635
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Ordinary Least Squares Regression
I am quite surprised that a variant of linear regression has been proposed for a challenge, whereas an estimation via ordinary least squares regression has not, despite the fact the this is arguably ...
- 1,430
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26
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Weighted average - the pressup trend problem
Let's say that this array is how many press-ups I've achieved each day in the last 28 days:
...
- 11.1k
17
votes
4
answers
448
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Cross-Alphabetic Characters
Background
I saw this very interesting Venn Diagram on wikipedia: https://simple.wikipedia.org/wiki/Alphabet#/media/File:Venn_diagram_gr_la_ru.svg
It shows the letters (physical shapes) in different ...
- 1,577
24
votes
22
answers
2k
views
Frequency Distribution of Mixed Dice Rolls
A follow-up to this challenge
Given a set of mixed dice, output the frequency distribution of rolling all of them and summing the rolled numbers on each die.
For example, consider ...
user45941
6
votes
4
answers
308
views
Find the smallest number of participants with resulting percentages
Programs often list outcome statistics, such as this:
54% of participants received an award
69% of participants got a promotion
85% of participants increased their salary
These percentages are the ...
- 187
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votes
36
answers
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An Array of Challenges #3: Moving Averages
Note: This is #3 in a series of array-manipulation challenges. For the previous challenge, click here.
Moving Average of a List
The moving average of a list is a calculation resulting in a new, ...
- 13.9k
13
votes
17
answers
1k
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Ten-row bar chart
This is Hole-1 from The Autumn Tournament of APL CodeGolf. I am the original author of the problem there, and thus allowed to re-post it here.
Given a list of numbers, produce a horizontal bar chart ...
- 27.2k
23
votes
22
answers
2k
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Frequency Distribution of Multiple Dice Rolls
Given two positive integers a and b, output the frequency distribution of rolling a b-sided ...
user45941
13
votes
4
answers
402
views
Rank Correlation Coefficient
The usual correlation coefficient (in 2d) measures how well a set of points can be described by a line, and if yes, its sign tells us whether we have a positive or negative correlation. But this ...
- 43k
7
votes
4
answers
700
views
Let's play POKE!
Poke is a really simple incomplete-information game. It's like "Poker", but simpler. At the start of every round, each player is dealt a hand. To simplify things, a hand is a uniformly distributed ...
- 1,560
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votes
5
answers
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Fake Statistics
If you're going to invent some fake news, you'll want to fabricate some data to back it up. You must already have some preconceived conclusions and you want some statistics to strengthen the argument ...
- 69.2k
33
votes
56
answers
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Compute the Median
Challenge
Given a nonempty list of real numbers, compute its median.
Definitions
The median is computed as follows: First sort the list,
if the number of entries is odd, the median is the value in ...
- 43k
15
votes
16
answers
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Compute the Wilson score interval
The Wilson score interval is a confidence interval of the probability of success, based on the proportion of successes in a set of Bernoulli trials (a Bernoulli trial is a trial in which exactly two ...
user45941
3
votes
3
answers
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views
Correlation Coefficient of Words [closed]
This is going to be relatively quick...
Challenge
Given a lower-case word as input, calculate the Pearson's Correlation Coefficient between the letter position of the word (nth letter within the ...
- 7,464
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votes
5
answers
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Fun with strings and string lengths
Introduction
Inspired by Dyalog Ltd.'s 2016 student competition. The challenge there is to write good APL code, but this is a code-golf and it is open to all languages. Derived from this closed ...
- 27.2k
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votes
22
answers
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Interquartile Mean
Task
Given (by any means) a sorted floating point dataset, return (by any means and within 1‰ of the correct value) the interquartile mean.
One possible algorithm
Discard the lowest and highest ...
- 27.2k
30
votes
43
answers
3k
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Mean bits: an average challenge
Given an integer N >= 1, output the mean number of bits in an integer from 0 to N - 1
Specification
The output can be calculated as the sum of the number of bits in the binary representation of each ...
- 10.7k
-1
votes
2
answers
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Restricted average (arithmetic mean) – i.e. without obvious built-ins [closed]
Introduction
The arithmetic mean is defined as being equal to the sum of the numerical values of each and every observation divided by the total number of observations. Symbolically, if we have a ...
- 27.2k
12
votes
1
answer
405
views
Iterated Moving Average
If we have a list, say the list [9, 2, 4, 4, 5, 5, 7], we can do a moving average across it.
Taking a window of say, 3 elements, each element is replaced by a ...
- 25.5k
11
votes
4
answers
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Cause maximal disruption to a Straw Poll
Context
Straw Poll is a website that is meant for the creation of simple/informal polls. Provided with a list of options, the user can select their choice(s), and the votes are tallied up. There's ...
- 28.5k
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votes
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A Free Sample of Autocorrelation
Consider a 1-dimensional, real-valued vector x that represents observations of some process measured at equally spaced intervals over time. We call x a time series.
Let n denote the length of x and ...
- 24.2k
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votes
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answers
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The PPCG Handicap System
As we all know, meta is overflowing with complaints about scoring code-golf between languages (yes, each word is a separate link, and these may be just the tip of the iceberg).
With so much jealousy ...
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votes
1
answer
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Calculate the average and standard deviation, rubiks cube style
Introduction
When solving a rubiks cube, one often write down the times like this
11.91, (11.28), (12.32)
This is called a average of 3, while a average of 5 ...
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votes
32
answers
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Calculate Standard Deviation
Challenge
Given a list of numbers, calculate the population standard deviation of the list.
Use the following equation to calculate population standard deviation:
Input
The input will a list of ...
- 22.8k
8
votes
9
answers
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Calculate the correlation coefficient
Given a series of numbers for events X and Y, calculate Pearson's correlation coefficient. The probability of each event is equal, so expected values can be calculated by simply summing each series ...
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