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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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Hausman Test Reults Report

I've been working on a research project using a multi-level regression model, and I'm currently figuring out how to present the Hausman test results. I've seen some papers where authors mention doing ...
Sabrina's user avatar
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Is considering a specific distribution necessary before computing an average?

Many times, I compute averages of variables without considering distributions at all, and I use those computed averages to represent measures of variables in my data without mentioning specific ...
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Strange Behavior When Cleaning Dataset in Pandas (Data Type Conversion and Missing Values) [closed]

I was working with a dataset where the features were unknown (encoded names) and, even though all of them already contained numbers, the data type was string or object. Additionally, it was indicated ...
Pedro Henrique Fernandes's user avatar
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calculating percentage normalisation

Please don't laugh or close this post I am confused as to how I can calculate the percentage normalization occurring post treatment. So, here is a background of the problem, I have reading from ...
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Reference for Directional Statistics of Plane Orientation

I've got a project I'm working on where I've got the orientation (normal) vectors of planes. These vectors are all within a unit hemisphere where the $z$-coordinate is strictly positive. The ...
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Analyzing lists and variables of multiple answers

My current issue lies within EMR extracted data for medications. There are multiple variables named: Medication_1, Medication_2, Medication_3, etc... This data may overlap and analyzing each column ...
Abdallah Al-Ani's user avatar
4 votes
1 answer
66 views

How is this formula derived

I have carried out an experiment with several repeats and my program has returned the values of EC50 and its CI(95%) confidence intervals, LogEC50 and the standard error of (LogEC50). The logs are ...
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Normalization of absorbance data by fresh weight of samples

A [protocol] says For each sample the absorbance (Abs) reading was divided by the fresh weight of the sample in grams. The results were normalized using an arbitrary value of 1 for the control ...
user414999's user avatar
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Survival function for a certain population

If the survival function for a certain population is given by $$ s(x) = \left( \frac{1}{1+x} \right)^4 $$ for $x \ge 0$, how long would you expect a person who is $41$ years old to live? (a) $14$ ...
mattsteiner64's user avatar
2 votes
0 answers
43 views

Standardization of summary statistic of group-linked values

Assume that you measure a summary statistic (e.g., arithmetic mean) in measurement windows of a fixed size along a long sequence of values and that these values are grouped into regions belonging to ...
Michael Gruenstaeudl's user avatar
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OLS Model with Lags - logged coeff

i am building a OLS model using python, where the dependant and independent variables are lagged. This is a form of econometrics model where i want to figure out how much each independent variable ...
milo204's user avatar
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Comparing one value to mean or median of a group

I have very limited statistical knowledge or experience, so I am looking for some guidance on my approach for statistical analysis. I have a group of 60 values. I am looking to compare the last value ...
snalmznh's user avatar
2 votes
1 answer
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Should we routinely conduct unsupervised learning when reporting descriptive statistics on data?

A standard approach prior to conducting a predictive or inferential analysis is to report some basic univariate descriptive statistics on the study variables: mean, median, minimum, maximum, variance, ...
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how to summarize moving average

This question is about how to summarize moving averages. Please assume the values in column Pct are % of people how have negative opinion about vaccine. column MovgAvg is the two year moving average ...
Ahir Bhairav Orai's user avatar
1 vote
1 answer
52 views

Which statistical model is suitable?

I have the results of a survey of $n=132$ patients with their socio-economic profile and their spending behavior on mobility-coins (my thesis topic). In the survey, we asked people how they would ...
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2 answers
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type I error in multiple comparisons summary statistics

I understand type I error can increase if we run 'multiple comparisons'. But does that refer to comparisons within a multi-category variable (or a group variable)? or multiple analyses using the same ...
aqen's user avatar
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Maximum Likelihood in High Dimensions [closed]

What are some examples of high-dimensional random variables for which MLE are solved using numerical methods because we are unable to explicitly solve the equations nicely? The only example to comes ...
Nicolas Bourbaki's user avatar
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Variability of patients in different Hospitals

just to let you know that my statistical background is not very good. I made funnel graphs which shows the effect of polypharmacy against practice size. In the funnel graphs, a dot presents a single ...
Usman YousafZai's user avatar
2 votes
1 answer
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Should a Better User Engagement Model Keep Outperforming Old Models Across Time?

Context Let's say we are talking about a machine learning model that governs some user interaction (e.g. pricing model, recommendation model etc.) on an app. Let's say model v1 is champion (in ...
Della's user avatar
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3 votes
2 answers
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Is the exponent of the MAD (Median Absolute Deviation) of log transformed Data measuring the relative distance from median in the untransformed data?

I want to confirm whether taking the Exponent of the MAD of Log Transformed Data gives me a measure of relative distance from median of the original untransformed data. So say I have a MAD of 0.2 for ...
Anon9001's user avatar
1 vote
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Degrees of freedom for estimation

In the context of estimators, why is it that in general dividing by the degrees of freedom(instead of the sample size) leads to unbiasedness? I see the value in substituting degrees of freedom for ...
secretrevaler's user avatar
1 vote
1 answer
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Percentiles of a distribution of weighted summary statistics

Suppose I have a collection of different independent probability distributions, $\{ P_i(X)\}_{i=1}^N$, each with their own support $I_i$. I know that the $10^{th}$ percentile of a given distribution ...
David G.'s user avatar
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Looking for ideas to improve Weighted Moving Average result

I have two data sets: ...
Allan Xu's user avatar
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0 answers
29 views

Comparing averages of two groups

Say I want to check if the averages of 2 groups (A and B) are the same. For each member in group A, there are some observations; same applies for group B. If I want to take the average of A and B, I ...
Andrei's user avatar
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Is it possible to calculate a standard deviation from the gini coefficient and mean?

I am looking to create an analysis showing how many people in a given country have more than than X dollars in income. I know the average income, population count, and Gini Coefficient of income ...
Andrew's user avatar
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13 votes
8 answers
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Is descriptive statistics enough to compare test scores of students in a class?

I am reviewing the theory on hypothesis testing and the book I am reading ("Hypothesis Testing" by Jim Frost) stresses the fact that we do hypothesis testing and inferential statistic when ...
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How to Evaluate Interaction Effects in Propensity Score-Matched Samples:

Suppose I want to study the association between an exposure X and outcome Y, and I have used the propensity score to match each exposed subject with those unexposed but with similar characteristics ...
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1 answer
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How many samples should I test to be 95% sure that no error exists?

If I have a million population of products and I will tolerate no error in them. How many samples should I test to be 95% sure that no error exists? I am new to statistics. I know you might need some ...
Polime's user avatar
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0 answers
61 views

Difference between Cross-Sectional and Nested Case-Control Samples in Cohort Studies

I have a question regarding the cross-sectional sample from the most recent visit and the nested case-control sample extracted from a cohort study, especially when the exposure of interest was ...
zjppdozen's user avatar
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7 votes
2 answers
591 views

average revenue per user increases each country but decreases when combined

I'm trying to figure out what could be some reasons when we do the AB testing we're seeing average revenue per user increases for each country but when we calculate the overall average revenue per ...
ggggogloria's user avatar
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35 views

Find correlation from biased observations

I have a set of observations of a variable Z (shown as the colormap) as a function of two other variables A and B. I want to study how Z varies with respect to A, B, and both A and B (eg. if A ...
Euryproktos's user avatar
1 vote
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Regression when multiple observations per individual but final result is the same

I'm very new to data analysis. I'm trying to find the causal effect of seating row and laptop use on grades at a specific university. I have data from 15 introductory economics lecture sessions ...
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What is a good metric for agreement in this problem?

Suppose I have a dataset that needs annotations. I have about $5000$ total $x$ values, and annotations by humans are needed to create $y$ values. $y$ takes a value in $\{0, 1\}$. For example, consider ...
whoisit's user avatar
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0 answers
15 views

Error Bars for Incidence of a Rare Medical Complication

I am making a plot of the incidence of a medical complication by the drug dose used. The incidence is very small, and so I am getting huge error bars using standard deviation-based methods, even ...
Micah's user avatar
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37 views

Need help with chi-square test interpretation with adjusted residuals

I have conducted multiple chi-square tests to compare 3 customer segments (1 cat variable, 3 groups) on different categorical variables. As the chi-square tests are not 2×2, I have asked SPSS to ...
Tom's user avatar
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Help me understand Z coefficients

When working with sample size equations, one uses the Z coefficients Z$\alpha$ and Z$\beta$ which are the Z-coefficient for Type I and Type II error rates. These coefficients are from the standard ...
AdrieStC's user avatar
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3 votes
3 answers
336 views

Cronbach alpha - descriptive statistics

I researched thinking styles based on Sternberg's Investment Theory. I used a TSI questionnaire that measures preferences in thinking styles. The problem is that I got low scores of Cronbach's alpha ...
goldy's user avatar
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0 answers
20 views

What weight to use for using NAMCS and NHAMCS together?

I am interested in analyzing the total prescription of aspirin in NAMCS and NHAMCS (https://www.cdc.gov/nchs/ahcd/index.htm) during a given year for all visits. NAMCS and NHAMCS each had a weight and ...
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1 vote
0 answers
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Developing a Confidence Interval of Density Functions for Uniform Periods in Seasonal Time Series Data

Suppose I have a set of observational data as a time series where the observations are collected at uniform interval over the course of several years. The data exhibits seasonality over the course of ...
mtp's user avatar
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0 answers
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Summary statistics (mean and standard error) of split plot nested design- using R

I have a study with a split plot design where every season (wet and dry) we sampled for 3 years at 8 sites. At each site (fixed factor), we have plots (nested within sites) and then we have subplots ...
Veronica's user avatar
0 votes
1 answer
19 views

How to interpret a regression with years on the LHS

I would like to know how I can interpret the coefficients in a regression when the dependent variable is years. For example, suppose I am interested in the year different cities received a new Apple ...
Cola's user avatar
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2 votes
0 answers
17 views

How do I determine how well a person does on average compared to previous work done in their same position?

I'm currently leading a group of missionaries and I want to find out how well each missionary is doing compared to the average in their area. Each area has a historical data of how well it's performed....
Elder Wang's user avatar
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0 answers
18 views

Can you create an age structure of population, if the age was established using multiple different methods?

I want to analyse a age structure of my sample. However, I was not given the ages themselves and instead had to establish them using multiple methods with various coefficients of determination (not ...
Lucy's user avatar
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1 vote
2 answers
62 views

How to find a consistency index for a binary variable?

I am working on a project where there are 2 variables to monitor, say sales (actual) and projected sales (target). The sales ...
badc0ffee's user avatar
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0 answers
23 views

Methods for describing higher level categories (aggregate summarized values or all original values)?

Let's say there is this questionnaire-based study: A restaurant serves these 2 categories: Food ("f") and Drink ("d"). Each respectively has hamburger (f1), fries (f2), and fried ...
bluewater1's user avatar
5 votes
2 answers
1k views

Can I use p-values without hypothesis?

I have been working on my Master's Thesis which included a survey and its results have been put through various tests. The unusual thing about my Thesis is that I have no hypotheses at all, making it ...
Mel's user avatar
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1 answer
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How do we decide the sample size we need for ensuring reliability for a test?

There is a test consisting of 6 questions and additional sub-Qs. The test was translated into another language and the questions were adapted, but the reliability of the test was never assessed. The ...
jordanLeah's user avatar
2 votes
1 answer
62 views

Different notions of width for multivariate Gaussian distribution [closed]

Given a multivariate Gaussian distribution $\mathcal{N}(\mu, \Sigma)$ where $\mu$ is a real vector and $\Sigma$ an associated covariance matrix, I am looking for a good notion of width. There seem to ...
1 vote
0 answers
43 views

Probability of Random variable less than a quantity containing random variable [closed]

What is the probability of the following: $P\left(Z_j>\frac{\epsilon}{a_j*R}\left(\sum^{M}_{m=j+1} ~ a_m*R*X_m+1\right)\right)$ where $Z_j$ and $X_m$ are independent and identically distributed ...
learning statistics 's user avatar
1 vote
1 answer
183 views

What do these Wilcoxon values tell me?

I did a pre and post-test with a small number of students ($n=12$).These values came after a science intervention that took $4$ weeks. I used a Wilcoxon test for 2 related samples as there was not a ...
jordanLeah's user avatar

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