# 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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### determining comparable individual performance within a team sport

i have collated a significant body data for a local badminton league (> 20000 indvidual games) and while i have the means to extract data on a: per player per couple per team per club per season ...
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### Comparing pre and post treatment data - best statistical test?

I am analysing a range of clinical outcomes for a drug treatment and need to compare the values pre and post treatment - I’m using excel to do this and have found that for most of my outcomes the data ...
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### Best practice for comparing data between completers and non-completers?

I conducted a study which collected data on a brief one-time intervention at 3 timepoints (pre, post, and one-week follow-up). There were some participants who dropped out between these 3 timepoints. ...
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### Variance of sampling distribution

$\operatorname{Var}(\bar X)=\sigma^2/n$ is the formula of variance. I want to check my understanding of this concept. Suppose I want to compute the mean household income of a given city. I collect all ...
1 vote
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### If we know the exact value of the population parameter , is there any point in doing the hypothesis testing? [duplicate]

Question - In a year there are 956 births in a town A of which 52.5% were males, while in town A and B combined, this proportion in a total of 1406 births was 0.496. Is there any significant ...
1 vote
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### Was my path of statistical data analysis correct/logical? [closed]

I analyse physicochemical data from the river and two rows of wells - one located closer and the other further from the river. The study's main aim is to investigate the variability (or heterogeneity)...
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### Which observations should I use for my panel data analysis?

I am currently working on my Master's thesis and for this I would like to examine the impact of the geographical location of Mutual Funds on their performance. For this I have panel data of mutual ...
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### Guidance for statistical analysis on academic collaborations [closed]

I am currently engaged in a research project involving data analysis in the field of academic publications and author collaborations. The dataset I'm working with includes information such as ...
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### Can LASSO still perform regularization on summarized data?

Currently, we are trying to predict future revenue from existing users. We use the revenue collected after 14 days of membership to predict 3 year membership. We train the model and make predictions ...
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### Range of correlation between two stacked pairs of data

Similar questions have been asked before where we have Cor(X,Y) and Cor(X,Z) and we want to find out the range of correlations of a linear combination of X & Z with Y. Or a third correlation: (X,Z)...
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### Should I be concerned of Over-Optimism in Nested Cross Validation with Multiple Scoring Criteria?

Suppose I am using Nested CV to estimate the generalized error of a model and a set of hyperparameters. I have chosen two scoring metrics of interest: Brier Score and AUC, because I want to get an ...
1 vote
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### Normalizing Euclidean distance by the length of the vectors [closed]

Suppose I have 4 vectors, the first 2 vectors are of length 4 and the last 2 vectors are of length 400. all values in the vectors range from 0.5 to 0.6. The Euclidean distance between the last 2 ...
1 vote
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### ordinal data negatively skewed. Help me :( [closed]

I'm working on my masters dissertation. Please help me this is my very first ever quantitative research and my submission deadline is very soon and my brain is literally melting into soup :( 1- Data ...
1 vote
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### How to find an "upper margin" for data on visits

For a handful of store locations, I have data on each entrance and exit time. I have counted the total num of people at a store at any given minute. I am trying to find out the values for which the ...
1 vote
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### How can I perform statistical analysis, (PCA sPLS-DA) etc on a dataset which has many missing values? [closed]

I have a dataset of mass spec analysis which was sent to me in 200 excel files. Importing into R, I get a dataframe that looks like this: | Unique Sample ID | Chemical Name | Concentration | | --------...
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### Statistical explanation for a way to group data

I would like to know if there is any statistical explanation on why it would be a good idea to group some data into the following way: find the maximum ($\max$), minimum ($\min$), mean ($m$) and ...
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### Correlation of X/Z with Y vs X with YZ

Let’s say that $X$, $Y$ and $Z$ have some fat tailed distribution, $X$ and $Y$ are stock returns, i.e., the sample set can have both positive and negative values. While $Z$ is some random variable ...
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### Correct way to express a mean rate between two groups

I am a novice in statistics so pardon my rather simple question. I have a retrospective case-control study, I would like to show the rate of admissions (ie number of admissions per year) of my cases ...
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### Beyond Cox Regression, what are good ways to compare two populations life expectancy/mortality rates given health parameters through time?

I am given two datasets, from which I am seeking to evaluate if there is any difference in life expectancy/mortality rates between these two male population datasets (approx. 500 and 2000 data points ...
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### Is the mean difference between two groups a relative treatment effect?

In randomized trials, I know that treatment effects such as the odds ratios, relative risks and hazard ratios are considered relative treatment effects. What about the following effect sizes? a. Mean ...
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### One Card Poker Expected Value

At my local casino there is a one card poker game with the rules as follows: The game is essentially WAR you get a card and the dealer gets a card. To beat the dealer you need a higher value card (in ...
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### Interpreting the output of an ANCOVA as regards to the descriptive statistics

I'm quite annoyed by the outputs of one my analyses. I'm conducting a repeated measures ANCOVA including two IVs, one DV, and two covariates. My issue is that when I include my two covariates, the ...
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### How do you calculate descriptive statistics before and after matching multiply imputed datasets?

I'm trying to find the best way to calculate descriptive statistics following matching on a dataset with missing values (handled using multiple imputation). The purpose is to present this data as &...
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### Distance metric to compare statistical features extracted from 400 time series for time series clustering

I would like to cluster 400 car rental demand time series (small positive valued) based on the following 7 statistical features: entropy, number of mean crossings, 95th percentile, root mean squared, ...
1 vote
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### Metabolomics run showing batch effects due to non authentic standards - how to present biological effects across 3 different runs

Within each run, the experiment is set up as below: Genotypes refer to: WT (Wild type as blue), PKO (Partial Knockout in green), FKO (Full Knockout in red) Biological triplicates means the same ...
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### Covariance between slope parameters/regression coefficients in a regression model

Let's assume a three-variable regression model. $$\large Y_i = \beta_1 + \beta_2X_{2i} + \beta_3X_{3i} + u_i$$ Can you derive the formula of covariance given below?  \large var(\hat{\beta_3}) = \...
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### Can I do skewness on multiple standard deviation?

I have a 1000 sample of an electrical test at each 4 different time, so I do simple descriptive statistic to obtain standard deviation at each 4 different time. Can I then use skewness on standard ...
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### Minimum Numbers of Observations for Standardized Moment Calculations

You can take the mean of any number of values, including just one value - in that case, the mean will just be equal to that value. Standardized means (standardized first moments) are always equal to ...
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### What is the N on a product mean?

I want to sum the means of various measures within a treatment group, and found previous posts helpfully describing how to calculate the Standard error of estimated sum or product mean. My question is,...
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### Salesman Auditor problem: Which mean and median is correct? What is preferred?

Trip Days Expenses Expenses per day 1 0.5 13.50 27 2 2.0 12.00 6 3 3.5 17.50 5 4 1.0 9.00 9 5 9.0 27.00 3 6 0.5 9.00 18 7 8.5 17.00 2 Total 25.0 105.00 70 Question: The following data ...
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### How do I re-generate my bootstrap statistic based on saved summary statistics from bootstrap

So I estimated a particular statistic $\Phi$ (custom made) by bootstrapping 1000 samples from the original dataset to generate 1000 different $\Phi$s. The issue is that saving those 1000 bootstrap ...
1 vote
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### I am trying to visualize the NHANES dataset using the PAXINTEN of the individual which is intensity recorded by accelerometer [closed]

I am running the following code: ...
1 vote
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### Explainability of groups mix affect on overall mean

I am stuck on understanding the best way to approach this problem from a purely statistical/mathematical way. Say that I have this data in the table below. It shows the comparison of prices for one ...
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### What are some relevant statistic calculations?

I applied a test for attachment and 2 different tests for internet addiction to 114 highschool students. All tests have a Likert scale 1-5. My hypothesis is that the attachment and internet scales ...
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### What's the correct way to report location and spread descriptive stats when you have repeated observations and unequal sampling?

Objective: Report summary statistics for each treatment x timepoint x condition sub-grouping when there is unequal sampling and repeated observations per subject. It is assumed that all the subjects ...
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### Describing historical performance of probability predictions

I'm trying to think of a descriptive statistic in the context of sports betting. Some background: Sportsbooks post odds such as -150, +200, etc... for moneyline bets (aka betting on winner). These ...
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### Question about using the chi-square test on an astronaut dataset to determine if over 1000 hours in space and early mortality are related

I am analyzing an astronaut dataset to try and determine if a high number of hours flown in space (>1000) by an astronaut is related to premature death (which I defined as dying before the age of ...
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### Relate ratios to sample size

suppose to have the following situation: you have a total number of deaths equal to 120. Of them, 20 individuals had cancer. The ratio is 20/120 = 0.16. The total individuals with cancer was 320. How ...
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### Inference and Linear Regression when dependent and independent variables are political party vote shares

Imagine there are two parties that compete with each other for votes. If Party A wins votes in a certain town, it's most often from winning over voters from Party B. In my scenario, Party A is a large ...
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### Estimate overall descriptive statistics (such as mean, Std, CI ) for 100 resampling with same sample size and same population

I have a sample of data with n=200 and I would like to predict my descriptive statistics such as mean, Std Dev and 95% CI when I have specific sample size for example n=10 based on the current study. ...
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### Is there a statistical test for five groups with averages ONLY?

The data I collected was measuring plant shoot masses and these were extremely small, so I could only find the total mass of the shoots from 30 plants. Hence, I only have the mean and none of the ...
1 vote
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### Calculate a mean percentage

I have some percentages calculated as follows: 8/51 = 15.69 12/91 =7.19 12/167 = 13.19 Is there a way to calculate a mean percentage taking into account that the denominator differs? Thank you in ...
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### aggregate variance or standard deviation similarly as weighted mean

Say I have several regions' melon produce data. I wish to measure the variability of melon weight in each area, and summarize these as an overall variability metric accounting for the different sizes ...
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### How do I analyse the impact of various macroeconomic factors on 7 currency pairs?

I’m doing a Bachelor Thesis on “The Impact of Macroeconomic Factors On Currency Exchange Rates”. Narrowing down towards my methodology section, my professor advised me to analyse about 7 currency ...
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### what do we mean by range in descriptive statistics?

The definition of the range has been given as the difference between the largest and the smallest value of the distribution. This, in my perception, tells us the discrepancy between the smallest and ...
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### spss, what type of statistics can I do knowing the test of normality

this is a small portion of the data...... total around 700 Ano, Sexo, Bips, APT, Peso, Altura, IMC 7,00 1 46,00 AP 38,20 1,52 16,53 7,00 1 47,00 AP 39,20 1,56 16,...
1 vote
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### What does standard deviation mean in simple terms? [closed]

There are multiple sources to answer the above question. For example here it says Standard deviation tells us about the variability of values in a data set. It is a measure of dispersion, showing how ...
1 vote
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### How to calculate standard deviation for the difference between two means?

I am writing a paper where I am comparing the change over time of an intervention and control group. I have the mean and standard deviation for both groups at baseline and the mean and standard ...