Questions tagged [descriptive-statistics]

Descriptive statistics summarize features of a sample, such as mean and standard deviations, median and quartiles, the maximum and minimum. With multiple variables, may include correlations and crosstabs. Can include visual displays - boxplots, histograms, scatterplots and so on.

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13 views

Sensor data completeness

We have several sensors collecting data with a specified frequency (usually every 20 minutes but it varies) over a period of many years. The person that programmed them made sure, as a space saving ...
18 views

How to count words in a dataframe?

I would like to count how many Male and female who answer (ex. Biking / Cycling). Below is the sample data:
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PSI where not to use

From what I understand PSI is used for continuous data. Generally, equal sized bins are created to compare two data set, and number of buckets is usually 10. Is that for a reason, why 10 bucket? Also, ...
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Making my dataset stationary increases SampleEntropy score

When i make my dataset stationary by the taking difference method, my SampleEntropy score is increasing. It means my data is being "less forecastable". But my results are deffinetly better ...
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When do I need Statistical Signifcance testing and when not?

Hi there I have a handful of questions regarding statistical significance testing. As a newcomer I have sometimes topics that I do not really understand entirely. One of them is checking for ...
11 views

Calculate rate from related datasets

I have the monthly sales rate for various products. The products are sold in different countries. I'm looking for a meaningful way to calculate the sales rate at each country. The sales rate indicated ...
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Time Series Analysis for Categorical Data Output

Suppose I am having dataset which consist of date as one column and fruits as second column which is categorical data having set of 4 different fruits in that column and my output column has 0's and 1'...
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Dividing a data set into segments with consistent inner behavior, using segmentation algorithms and metrics for consistency

Context of the problem: I have signal data which was recorded in a software system and which shows the runtime of multiple processes over time. In total there are more than 900 processes each having ...
1 vote
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Trying to get an idea of decile system

I was checking a Linkedin profile and I came across this statement in the “Grade” section. It’s a little confusing. It is as follows: “Grade: gpa within the first decile”. Is this statement correct? ...
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1 vote
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what is a collective term for things as screening failures, no response and drop-outs

Hello wondering what is a collective term (in terms of statistics) for things as screening failures, no response and drop-outs?
1 vote
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Null and 0 Values Handling - Basic Statistics [duplicate]

I am trying to do some descriptive statistics and basic graphs on relatively small data sets derived from environmental sample collection and/or chemical research. It turns out that sample points end ...
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A measure of redundancy in mutual information

Mutual information quantifies to what degree $X$ decreases the uncertainty about $Y$. However, to my understanding, it does not quantify "in how many ways" $X$ decreases the uncertainty. E.g....
1 vote
73 views

Estimating the (normal?) distribution of the grayscale values of a region in camera footage

The problem: Given a small ($25\times25$) region on a $1080$p image extracted from camera footage of a railway system, I am trying to detect whether there is a train present or not. I proceed to take ...
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1 vote
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Applying an algorithm on it's own training data for descriptive purposes?

Good Day, I am newer to data science so I am not confident in this. To set up the question I will describe my data and approach. Data I don't want to share specific data examples as I want to try and ...
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Understanding math notation in infoGAN paper

I'm reading this paper about mutual information in infoGAN infoGAN_paper_link and already have the code to run it. I pretty much found code for it which is fine and dandy except for the fact that I ...
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1k views

Calculating correlation for categorical variables

I am struggling to find out a suitable way to calculate correlation coefficient for categorical variables. Pearson's coefficient is not supported for categorical ...
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What is the best way to cluster this kind of data?

I have data that looks like this: The chart on the left is the trend and the smaller chart on the right is the box plot showing the distribution of means. Each color is the output of a particular ...
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1 vote
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Accuracy over different sample sizes from dataset

What I'm trying to do is predict how much more data would help in a classification task. So, what I'm doing is bootstrapping entries in my dataset to get a sample, with a specified size. Then, I fine-...
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215 views

p-value and effect size

Is it correct to say that the lower the p-value is the higher is the difference between the two means of the two groups in the t-test? For example, if I apply the t-test between two groups of ...
1 vote
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paired t-test shows no difference between median and Wilcoxon test p value shows that there is a difference between median values ? How to interpret?

I have a dataset. I wanted to do paired t test on it. So I carried out normality test and it showed that it does not follow normal distribution. So I used Wilcoxon test in place of paired t test. The ...
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1 vote
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How to bin a distribution data reported with different frequencies ( salaries ), showing mixed linearity and non-linearity?

I am researching on pay-scales, and wish to receive advise to treat data of salaries. Objective My interest is to approximate the salary corresponding to different hierarchical levels in an ...
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Data calculation/normalisation /data summarisation

Clustering is done based on houses data and say suppose cluster 1 contains 5 houses. Appliance 1 is used in 2 houses out of 5 and appliance 2 is used in 4 out of 5 houses.Each appliance produces an ...
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Statistical method to find the value which preserves the most information inside "most" of data points. (resize images to a common height)

So I have this data of around 88K images and I found out some interesting properties for my images. ...
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How to get a (descriptive) overview of a large database?

I'm facing a data framework with ~ 20 k observations and 151 variables across 2078 subjects At first I am primarily interested in how the data looks like related to a single parameter. But I cannot ...
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A/B Testing (Binomial Distribution vs Random Distribution)

When performing an A/B test for the number of clicks for users viewing (each view is an impression) two variants of an ad, a binomial distribution can be assumed where each variant has a constant ...
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Normalise the scores by small and large numbers division

I am working on a scoring problem use-case where I will score each task based on few aspects and take an average of scores of tasks in each experiment. For each experiment I will have 1 to N number of ...
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1 vote
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Can a Box plot be used for finding the useful features from the dataset? [closed]

I am reading a book by professor Trevor Hastie and professor Robert Tibshirani called "Introduction to Statistical Learning". In the applied section of the chapter 4, there is a question 11(...
37 views

Analysis of passed/not passed students by enrolled year

I am analysing some data from my University about successful students through years. The dataset looks like as follows ...
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Problem regarding calculating correlation approach?

There are 3 columns say product_id, product_type, and price_drop. ...
152 views

How do I interpret the output of linear regression model in R?

I have the following linear regression model and its analysis. There are a few errors, but I am not very sure about the errors. I have not succeeded in finding them so far. First, the 95% confidence ...
150 views

Calculating Median and Mode of numerical variables for different subgroups in R

I have customer call data and I want to get the median and mode for the call success rate for different subgroups. My variables are: Customer ID, Employment Status (Retired, Employed, Unemployed), ...
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264 views

Distribution vs Histogram [closed]

I am not very good at understanding statistics jargon I tried to read articles on statistics every article says distribution and show a picture of bell curve. I understand that x axis of bell curve ...
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Getting the earliest date (duplicates due to several call ids and agents)

I am trying to get the earliest call interaction, with only the agent that interacted at that call and the customer id. Using the following code, I still get duplicates: ...
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Exploratory statistics, how to idenify and remove driver (bias)

I am looking at customer data, and created frequency tables (+histograms) for customers with different professional statuses and what the best time is to reach them. Status ranges here from employed, ...
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1 vote
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Coefficient of variance problem

I am doing a project and I am facing a problem I have no idea how to solve. I have a data series of stock prices, and, based on this series I obtained another series, of so-called rentabilities (which ...
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Drastic drop in Somers' D ? Why?

I came across to find the correlation between the ratings assigned by two coaches to a same group of 40 players. I have tabulated the results as below: The Somers' D is 50%. However, for the case ...
61 views

Insights betwwen two columns/variables in Dataframe

I have data in two columns one is range of old credit score (Input score range) and new credit score (cvsc100). How do i find insights from both of them ? where the old is range of values and other ...
39 views

(Basic) statistics

I got a misunderstanding regarding basic statistics (I think) but I can't get my head around that: I did an online survey regarding the usage of some application. The user could answer 1 (I don't know ...
1 vote
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How to handle and report patient characteristic statistic with missing data in essay?

I'm now working on an clinical trial essay with some doctors. When generating patient characteristic statistic form, I found basic patient characteristic data has some missing. The missing datas are ...
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How to interpret axis of Histogram and distribution curve?

After doing statistical analysis of data I got the below figures: The data contains a line length in meters which is represented with Line(m). The purpose here is to confirm the distribution behavior ...
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Seeking advice: How would you define "top performer" with a set of data?

still consider myself a noobie in ds here, so I may be asking a very easy and stupid question, but would really appreciate some guidance. The hypothetical situation is that, you have a website where ...
34 views

evaluation metrics for multiple values per session

I have an application that executes my foo() function several times for each user session. There are 2 alternate algorithms that i can implement as "foo" function and my goal is to evaluate them based ...
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Which statistical test tells which classifier performs better than the other?

I have 3 classifiers: A, B and C. According to accuracy, specificity, sensitivity, f-score, and g-mean, say classifier B performs best. Now I want to statistically validate this claim. How should I do ...
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Generating random numbers from best probability distributions?

I have done some statistical distributions on real-world data. The distribution fitting gives me the below results (lognormal fits the best on data based on chi-squared test): ...
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554 views

What do you call the ratio of positive to negative samples?

I am working with a binary classifier and I want to express the "balance" or "skewness" of the training data using a metric. I want to reflect this ratio in a report, like this: ...
1 vote
54 views

Analysis for basic weight training analysis?

TL;DR: I'm doing a fairly basic project which involves exercise. It seems that descriptive statistics and basic data vis (ex: line graph) would be most appropriate for this project, but I wonder if ...
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212 views

Aggregate several attributes into one using PCA

I am working on a soccer dataset. As we all know, soccer has a lot of different metrics related to the game. We have Key passes, Accurate Passes, Shots on Target, Saves, Clearances and so on... I have ...
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44 views

Normal distribution and QQ plot

I have data that I plotted with a normal distribution and a QQ plot. I was wondering especially in QQ plot it seems that 95.4% of the data is normally distributed. My question is what does numbers ...
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