Questions tagged [analysis]

For questions dealing with the applied analysis of a specific dataset or design of experiment. Posts tagged analysis are requesting statistical consulting assistance from the network. Questions tagged analysis need to be phrased appropriately.

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21
votes
6answers
17k views

What is the difference between data mining and statistical analysis?

What is the difference between data mining and statistical analysis? For some background, my statistical education has been, I think, rather traditional. A specific question is posited, research is ...
9
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2answers
1k views

When do we "stop" using multiple correction techniques?

I understand when performing a simple t-test, we typically control the type -1 error rate at $\alpha = .05$. This signifies that if the null hypothesis holds, the data will "incorrectly" reject the ...
6
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2answers
1k views

Can the differential entropy be negative infinity?

Define the (differential) entropy for density $f$ as $$ H(f) :=-\int_{0}^{1} f(x) \log_{2}(f(x)) dx \, .$$ I am trying to find a Lebesgue measurable $f$ defined on $[0,1]$ such that $f\geq 0, \...
6
votes
1answer
80 views

Correct statistical test when people could appear in multiple groups

Thank you in advance for your help. I ran a survey. People first answered a multiple selection question - they could select as many of the choices as they wanted. The question asked them their ...
5
votes
1answer
2k views

Difference between using a propensity score for matching vs. regression analysis

So I am confused on what the difference is if I match patients based on propensity scores vs. using the propensity score and then applying that into a multivariate regression analysis? Is there a ...
5
votes
1answer
2k views

Whether to apply the logit transformation to proportional predictor variables in a multiple linear regression? [including proportions of 0.0%]

In a linear regression, I have a number of predictors variables that are expressed as proportions. The outcome variable is continuous. My residuals are not normally distributed, with a mild to ...
5
votes
1answer
822 views

Fit a time series model with unknown lag in Stan

I try to fit a population time-series model in stan/rstan(2.7.0) where the death rate depends on the generation before (n-1) but the reproduction depends on a unknown generation (n-x). I haven't found ...
5
votes
1answer
490 views

Visually Comparing the Kaplan-Meier Curve to the Cox PH Model Curve

I am conducting a survival analysis and have a few questions regarding it's interpretation with respect to the Cox Proportional Hazards Model: Why does the inclusion of different covariates change ...
4
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1answer
128 views

Test for compairing data on same days in a week in different years

So I'm doing some power system analysis on active and reactive power loads and I'd like to compare the data from 2015 and data from 2015 to see how much they differ. The nature of the load is such ...
4
votes
1answer
204 views

Is an ANOVA applicable for these data?

I have a data set from 7 groups, with 20 fish in each group. Measurement of a parameter is made on 25 cells from each fish (so each observation in the data-set is completely independent, right?). One ...
4
votes
1answer
472 views

Controlling for baseline in pre-post between design: using $\Delta(T_2-T_1)$ or controlling for T1 in the regression model (or both)? [duplicate]

I have a mixed between-within design, with three groups and Pre (T1) and Post (T2) measurements. I'm hesitating on the right statistical analyses to do, but I would like to compare each group to the ...
4
votes
2answers
107 views

Measuring Circularity of a set of Co-planar points

I am trying to find a way to quantify how circular or symmetric a shape is. What is a good way to measure the circularity of these set of points? I already have the coordinates of the points along the ...
4
votes
1answer
194 views

Psychometrics: Survival analysis of help seeking behaviors

Background: I'm studying people seeking help. Participants described contacts with between 1 and 3 "responders" (e.g., friends, the police) in order- for example, a participant could have contacted ...
3
votes
2answers
5k views

Can a ROC Curve have a continous outcome variable?

I'm currently undertaking research creating cut-off scores using ROC curves. I have encountered some confusion regarding the outcome variable. My outcome variable can range in score from 10-50, and we ...
3
votes
2answers
932 views

When to use mean or median?

I am asked to put together some KPIs. I'm breaking down what the general lifespan of our subscribers is by industry. There are some industries I feel outliers are impacting what the average would be, ...
3
votes
1answer
2k views

How do you interpret the Cliff's delta & 95% Confidence Interval (2−tailed) graph?

I've recently just completed a cliff's delta on a data set containing ordinal data (Strongly disagree to strongly agree), and have graphed the results. I'm just a little wary over how to exactly ...
3
votes
2answers
236 views

Can an independent variable change during survival analysis?

Here's my question: Let's say I'm looking at smoking (categories smoker, ex-smoker, never smoked) and risk of death (binary dead, not dead). I have a follow-up of 5 years. What happens if someone ...
3
votes
3answers
916 views

Use of correlation analysis in machine learning?

I read that correlation is used to identify the relationship between variables and I have a few questions about the same, I was hoping someone could help me answer them. what is the use of knowing ...
3
votes
1answer
164 views

Is the difference between two iid log-concave distributions still log-concave?

Assume two iid random variables X and Y, with continuous and differentiable pdf $f$ and cdf $F$. Let Z=X-Y. Is the pdf of Z log-concave?
3
votes
2answers
3k views

Panel Data & IV

I have a panel data, and need to run an IV. I have only 1 endogenous variable. 1) Should I use a Two-stage least squares or a GMM? 2) I understand that GMM is only for dynamic panel data. What is a ...
3
votes
1answer
67 views

Most appropriate tests for two data set comparisons in R

So I have two datasets from two different groups (blackbirds and song thrushes), with the same 4 variables (Foraging, Singing, Alarm, Aggressive). I've been struggling to find a good way to compare ...
3
votes
1answer
2k views

Principal Component Analysis Stock Returns

I am new to PCA and am having trouble understanding some parts of the methodology. In multi-factor models you can run regressions like: Stock Return = A(1)*Size + A(2)*Market Return + ... So in ...
3
votes
2answers
341 views

Intuitive Interpretation of Interaction Term?

This is my first time posting on this site so please excuse me if I am not following certain rules or guidelines specific to this forum. I have a data set on a training program and I want to see ...
3
votes
1answer
1k views

Assumptions for Canonical Correspondence analysis

I have been trying to find the major assumptions a Canonical Correspondence Analysis makes when doing its analysis. I have had a hard time finding anything useful. I did, however, find the assumptions ...
3
votes
1answer
175 views

Does Sklean have a Gaussian Discriminant Analysis (GDA)

I was trying to look for the Gaussian Discriminant Analysis in sklearn however I was unsuccessful and I was wondering what it the name of it. I was about to find the LinearDiscriminantAnalysis and ...
3
votes
1answer
41 views

What statistical test should I use? Visitors distribution in fitness center

I conducted a field study where I gathered data about the distribution of visitors over the day in a fitness center. The goal of the study was to implement a treatment that would shift visitors from ...
3
votes
1answer
418 views

How to decide the number of options to give to people in a poll? (for opinion based, subjective contexts)

Just to be clear, this question is open ended on purpose, I am fine with(or even prefer to) being pointed to a few research papers, and proper areas related to this subject. I am not sure what I am ...
3
votes
1answer
56 views

Looking for interdisciplinary research topic [closed]

TL;DR: Are there any areas that combine (1) statistics/ML, (2) computation theory, (3) set/type theory, and (4) real/functional analysis? I apologize if I did not accurately categorize the domains ...
3
votes
1answer
270 views

Natural Resource Management: How do I estimate the odds ratio and confidence intervals from model-averaged estimates?

I'm currently working on a model selection analysis in the field of natural resource management. My research question is: what variables are important to an avian species nest site selection. My ...
3
votes
1answer
38 views

what family of function could that be?

I would like to find an analytical expression for a family of function that would look like the curves in the plot. Essentially ranging from the identity function up to sqrt kind of curve. What ...
3
votes
0answers
122 views

covid-19 available resources [closed]

I don't even know if this is the best place to ask it but, as a statistics community think somebody here may know something. I am wondering what kind of databases and data are actually available ...
3
votes
0answers
137 views

calculating orientation anisotropy of a set of 3D vectors

I have a set of unit-length 3D vectors (represented as cartesian 3-tuples) with 180$^\circ$ equivalence (rotated through any plane passing through the origin i.e. $v=-v$), all situated at the origin (...
2
votes
1answer
662 views

Multiple regression analysis on a sample size of 21

Am I allowed to use multiple regression analysis on a sample size of 21? I did the Shapiro - Wilik test on all four of my variables (p>0,05 on all of them). I also checked their linear distribuon and ...
2
votes
1answer
16k views

Yes/No question statistics

I'm very new to statistics and am trying to figure it all out! I have a number of yes / no questions answered from a survey. (a) I want to see if, in each question, there is a statistical significance ...
2
votes
2answers
275 views

Calculating the Mean of an Ordinal Variable Question

I have distributed and analyzed a survey regarding teaching quality. For some of the questions, I ask how often a given teaching method is used. When doing this I ask them to select one of the ...
2
votes
2answers
427 views

Can one perform a meta analysis on solely the results of a study, without the use of raw data? [closed]

If not, since a systematic review would be the next option, are there any analyses you can conduct on the results of the studies that one intends to analyze
2
votes
1answer
6k views

How to analyse survey data to find customer satisfaction from weighted scores?

I have survey data from multiple customers, where the customers have scored on a scale each question from 1 to 10, to indicate how much they agree with a specific question - 10 being the heights score....
2
votes
2answers
62 views

How do i interpret this Scatter Plot

I'm researching on the relationship between Scholarship and years. I have scatter plot below. The x axis is equal to the total amount of scholarship for a student. The y axis show the term a student ...
2
votes
2answers
45 views

What analysis do I do? (Wage, education, gender)

I'm doing research on pay in function of degree (master vs. doctorate) and gender (man vs. woman). My research consists of 1 dependent variable: salary (salary varies from 210 euro to 12.000 euro in ...
2
votes
1answer
246 views

Inventory forecasting algorithm for wines?

I'm trying to figure out a good inventory forecasting algorithm for wine sales. I have the following characteristics so far: Wine sales are cyclical and not seasonal Have incomplete time series: ...
2
votes
3answers
4k views

Is weight still a continuous variable if its measure is rounded to an integer?

So it is obvious that weight is a continuous variable as it can be quantified with decimal precision;like 10.2 kg and 3.0122 kg. If we were to round it to an integer like 10 kg and 3 kg. Would then ...
2
votes
2answers
1k views

How do I avoid multiple t-tests (or is it ok to use multiple t tests here?)

I've searched around CV for a bit, and have not found a good answer as to what test to use instead of multiple t-tests in my particular situation. I am interested in comparing mean size (of fish) ...
2
votes
1answer
35 views

Using phi as a measure of correlation for categorical analysis

I'm working on a data analysis project where I've been asked to measure the association between specific values of categorical variables, and I wanted to make sure my thinking was correct. So for ...
2
votes
1answer
90 views

Measuring solution quality and allele impact on population fitness for a genetic algorithm

Situation: Let's say you're running a genetic algorithm to improve the way people are interacting with an online service. The alleles in each individual determine the exact behaviour of the service, ...
2
votes
1answer
2k views

How do I interpret this ACF and PACF plot?

I am very new to time-series analysis and have got some time-series data regarding product prices. The data set is monthly data collect since 1993 to 2014. I have tried plotting the ACF and PACF but ...
2
votes
1answer
55 views

Questions about Data Analysis [closed]

For my research I'm examining whether applying a certain promotional intervention improves the amount of misshapen products bought. The study contains of two parts. In part 1 Scanner data from ...
2
votes
1answer
267 views

How to examine the relationship between categorical variables with several levels?

I would like examine if the job satisfaction of part-time workers is higher or lower compared to full-time workers. My dataset consists of 4125 cross-sectional observations. independent variable: ...
2
votes
1answer
77 views

Comparing changes in a response variable over multiple proportions at different sites

Say you have a variable, like average house cost. You have values of this variable at multiple sites in a city, and want to see how it fluctuates with respect to surrounding business type proportions (...
2
votes
1answer
65 views

Measure of Similarity Between Scatter Data

So I have two scatter data. I would like to determine the similarity between the two scatter plots. What is the good recommended measure that can be used in this case? Is there is anything simpler ...

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