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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5 views

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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26 views

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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15 views

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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1answer
44 views

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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35 views

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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2answers
24 views

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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1answer
25 views

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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Checking of Measurement in Grouped Data

My teacher uses the formula below when looking for the median and mode of a grouped data. $$ median = L_m + c\frac{\frac{n}{2} - F_{m-1}}{f_m} \\ mode = L_m +c\frac{f_m - f_{m-1}}{2f_m-f_{m-1}-f_{m+1}...
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How to compute single/unified summary statistics of multiple independent distributions?

Suppose I have multiple distributions which indicate the daily number of people taking the bus. So for 5 days I would have something like: ...
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101 views

Forecasting: Linear vs. Exponential vs. ARIMA

I have tried forecasting next 13 years data point by using past 20 years data (1998-2010) available in the following graphs. I used three models to compare- linear regression, exponential regression, ...
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How to measure the Kumo cloud thickness?

How to measure the ichimoku cloud thickness? Hi. The ichimoku kinko hyo is an indicator used in financial analysis. The kumo cloud can be used to describe volatility, based on it's thickness. How do ...
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68 views

Detecting the outliers from scatter plot

I am trying to understand this question from Everitt et al. (A Handbook of Statistical Analyses Using R) which asks, "Collett (2003) argues that two outliers need to be removed from the plasma data. ...
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Why do we report standard deviation instead of standard deviation of the mean in cross-validation?

I finished a statistics course and now I have some doubts about basic procedures used to train machine learning models. For instance, k-fold crossvalidation results are usually reported as: ...
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Mean and variance after transformation

A psychology teacher has given an exam in which the highest score possible is 200 points. the mean score for the 30 students who took the exam was 156, and the standard deviation was 24. Because there ...
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30 views

How to exclude events with low data (eg. threshold, outliers)

I have this data set and I want to filter only "Event" with a good conversion rate. We can say that good are those that have a higher than average conversion (but maybe you have better ideas). ...
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58 views

Monte Carlo Summary Statistics

My apologies if this is a dumb/obvious question. Suppose I am performing MC analysis of a method that produces statistical results. To be precise, consider an MC study of linear regression where we ...
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Calculating the error of data sampling in intersecting sets

I am faced right with a simple (I imagine!) statistics problem as part of my job, but as non-statistician I have no idea how to get a hold of it. Here it is: Let $X_i \subset X, 0<i<n$ for some ...
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Analyzing ABn test when normality is not met

I'm analyzing an unpaired A/B/C/D test to assess whether the mean or median of population B/C/D is higher than the one of A. As shown from the left plot the normality distribution cannot be assumed. ...
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Recommended textbooks for student majoring in applied statistics [duplicate]

I am currently a second year science student double majoring in biochemistry and applied statistics. The stats course im doing this semester (Statistical Theory) is focused on joint probability ...
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42 views

Is a predictive model the best way to generalize about my current data?

Suppose I have a customer dataset. My independent variables are various types of customer attributes (age, where they live, gender, price of the item they are potentially buying) and my dependent ...
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38 views

what is statistics uncertainty on a quizz score?

Remark : I have created the question from scratch : it is not my teachers who asked me that. I'm wondering myself about a general problem of uncertainty. Let's consider a 'school' quizz with D ...
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1answer
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Poisson Fun exercise question

Based on your understanding of the Poisson process, determine the numerical values of $a$ and $b$ in the following expression. $$ \int_{t}^∞ {λ^6τ^5e^{−λτ} \over 5!}dτ= \sum_{k = a}^b{(λt)^ke^{-...
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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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1answer
25 views

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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79 views

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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1answer
36 views

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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44 views

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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1answer
49 views

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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2answers
42 views

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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1answer
36 views

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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49 views

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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25 views

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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25 views

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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1answer
11 views

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): ...
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How do you compute Cross Correlation,Coherence and Mean Dealy?

This is my second time of asking question here, I am sorry if my question is trivial. I have been researching about economic forcasting using NBER type of analysis. It says about computing Cross ...
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29 views

What type of graphic will be suitable for 3 continuous vs 1 categorical variable [closed]

I want to create a graphic to explore relationship between 3 continuous and 1 categorical variable. I have 2 different examples I want to investigate. 1- the numeric variables are num of bedrooms ...