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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Identifying anomalies multiple time series using statistical methods

I am trying to detect anomalies from a Time Series sequence, that is calculated as an aggregate count of multiple unique Time Series'. For example, in the graph below: We have aggregate counts shown ...
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What test should i use to prove A is better than B [on hold]

I have sets of data that have number of goods produced by 2 machines, A & B for 2 months. Each machines has two numbers that is plan value and actual value. I'm not really familiar with hypothesis ...
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Summary statistics over varied n-modal Gaussian KDEs

I am analysing a bunch of data files which represent responsiveness of cells to addition of a drug. If a drug is not added, cell responds normally, if it is added, it shows abnormal patterns: (TLDR at ...
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how to construct an index that includes indicators like GDP and index e.g. HDI?

how to construct an index that includes indicators like GDP and index e.g. HDI? to be more precise I want to construct an index to gauge current condition of the economy, so for that I am constructing ...
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Assessing sample vs. “assessing population”

Suppose I have a group of people I want to know more about, i.e. my population. It consists of 100 people. I could take a proper subset of it, say 10 people, and survey them. Instead, I survey all of ...
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Number of samples to estimate Cauchy probability distribution?

I wonder how many samples (approximately) are needed to fit the parameters of a Cauchy probability distribution. I'm guessing probably more than with a normal.
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Statistical difference among groups

I have a sample of people answering a purchase intent question for 3 products. I tabulate the data and get this for definitely would buy: ...
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Matthews/Phi Coefficient on a 2x2 Contingency Table with Rare Positives

Suppose I want to measure the degree people like gold versus silver. For the sake of argument, let's say I have a contingency table like so: ...
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Way to make Z-Scores Positive

Hoping for some help with this. I need to calculate the the ranking for a number (eighty or so) groups, based on a number of component scores. Each component score is weighed. For example: Component ...
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Statistical evaluation metrics in Regression - What is a “mean signed difference?”

Here I am with another query regarding regression model statistical measures. In the KNIME analytics platform I am using for ML predictions, there's a statistical measure I get from evaluating the ...
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What measurement scale is the angle measurement assigned to (interval or ratio)?

I am a physiotherapist and am going to do clinical research based on RCT model. I am going to use a test based on degrees for ANGLES measurements. I am going to use a goniometer for such measurements. ...
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Average precision/recall of multiple classifiers on the same dataset?

If I have some N human classifiers that can only predict in terms of 0 or 1 (not probabilistic, and also disregarding their own uncertainty. They either know or they don't), and each yield different ...
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Missing quartile in boxplot

Currently I am creating a box plot. I am new on the field of statistics and especially box plots. Find the picture following: On the y-axis find the number of messages. I have problems understanding ...
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interpretation of Linear regression

I was reading about linear regressions on wikipedia and came across the mean and predicted response. I just wanted to clarify somethings. So suppose we have a simple linear regression model, is the ...
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What is a good measure of the similarity of 6 different time series?

Essentially, I have 6 different data time series that were each generated first using an industry standard methodology (call it method m.A) and then again using my technique (call it method m.B). ...
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What does it mean if the sobol main and total effects indices are the same?

What does it mean when the total and main effects ANOVA indices are the same? Does it mean there is zero interaction of the different inputs? Is there some other way to quantify or understand that? I ...
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What would be the outliers in this specific situation? (given in description)

Recently over a phone interview I was asked this: "I have data consisting of 102 points between 0 and 100 where the first 50 points, starting at 0, are incremented by 0.5 every time. The next two ...
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How to combine different results of a stochastic classifier

I'm writing a paper about a machine learning-based system and using CNNs on a GPU cluster to compare two methods of feature engineering. Due to the non-deterministic nature of the algorithm, I couldn'...
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How can I make input data for logistic regression?

I have dataset with 6 category variables. each category variable shows some machine error codes ranging between 0 and some big number like 50000. I want to try Logistic Regression to build a ...
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Calculate percentiles of angles/bearings in Python

I have a dataset with a variable that is the angle of the event (record) from a central point (e.g. crime events in relation to a defined city center). I want to calculate percentiles for the variable....
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Data Visualization: Summary Statistics

I have 10,463 observations of crop yield data, however, they are subdivided into 6 crops (~2000 obs each). I am wondering if it is best to report a summary statistics table by crop (maybe 3 crops per ...
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Why under an exponentially weighted moving average do volatility forecasts evolve more slowly over time if the decay factor λ tends towards unity?

For λ close to 1 volatility will evolve slowly over time, whereas volatility responds more rapidly when lambda is much smaller than unity. Conceptually, why is this the case?
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Does mean deviation from mean depend on change of origin and scale?

I know that SD depends on change of scale and not on change of origin. what about mean deviation? Mean deviation from mean = $\frac{\sum|X_{i}- \overline X|}{N}$.
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Linear regression with stochastic gradient descent p-values

Is there any way to get summary statistics (p-value specifically) for the results of a multivariate linear regression ($y = X\beta + \epsilon)$ using gradient descent? Most online library ...
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intuition behind SD+

so i was reading statistics by Freedman and in the section where he describes the t-test he goes on to explain why we would use the SD+ instead of the regular SD to calculate the S.E with the sample ...
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Which statistical test to use for binned data?

I researched for hours but cannot find the direction for the right test to use. I have a frequency distribution which shows bins on the x-axis that contain amount spent: 0-5\$6\$-10\\$ greater than ...
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Finding The Median

I am a first year student. I have had some exposure to statistics, but I do not know very much. Is there is a statistical method to find the median of marks given only the average of the marks and the ...
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Standard deviation for proportion with huge denominator

My question involves finding the standard deviation of a ratio when the denominator is huge. The standard formula $$\sqrt{\frac{p(1−p)}{n}}$$ yields a number that is almost zero. The context is ...
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Can mean standard error be transformed and remain interpretable?

Suppose I collect a two random sample from separate populations Sample 1 has: $$\bar{x}_1 = A \\ SE(\bar{x}_{1}) = C$$ Sample 2 has: $$\bar{x}_2 = K \\ SE(\bar{x}_{2}) = N$$ I am interested in ...
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Association between three categorical variables [closed]

Forgive me if this is a silly stats question. I have three nominal variables which describe yes/no for growth of bacteria. They are three different sample types (infant, poultry and floor surface). ...
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What statistics can I use to describe the shape of a time series?

I want to apply a clustering algorithm to some time series datasets. I've tried DTW, but it hasn't quite achieved what I want (which is to cluster similarly behaving series such that I can tune ...
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When to Throw out a Respondent (Likert data)

I have a dataset of Likert-type responses, with a few nonresponses throughout. However, one respondent only answered half of the items (basically stopping halfway through). Should a respondent like ...
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How to find association between time spent and capital raised

I have a data set that I would like to analyse in order to determine the most efficient timeframe to fall within when meeting with clients (in terms of capital formed): ...