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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.

0
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0answers
8 views

Survival-analysis dataset problem [on hold]

I need to analyze the duration of an event over the years depending on time variant variables, how can i setup my dataset? I already tried to do a panel data in which i record the variables for every ...
-1
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0answers
7 views

Find typologies within population [closed]

I think I screwed up my master thesis with a bad questionnaire. I have a total of 21 Likert statements which are in one big pile and not really sorted. I also have various nominal questions. I would ...
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2answers
32 views

How to analyze a small dataset?

I have this dataset and I'm not sure how to analyze it. I threw the classical regression methods such as OLS at it and haven't achieved much success. My response variables are ...
1
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0answers
33 views

How should I analyse the results of my experiments with respect to their hyper-parameters?

I trained (and tested) a CNN with the same architecture on the same task (MNIST). However, I trained it several times: one for each combination of hyper-parameters. Each model is trained and tested ...
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1answer
12 views

Amount of data needed for a statistically relevant regression analysis

Trying to determine if a logarithmic regression analysis is valid. With good R2 values, does it matter that there are ony 7 data points?
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0answers
17 views

Cox regression with two events

We have a status variable with three events: 0) Censored 1) Relapse 2) Death We want to examine if two different types of medicine have a different risk on either death or relapse. How can we compare ...
0
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0answers
9 views

How to analyze repeated measures data w/ no groups and w/o averaging the repeated measure scores

STUDY DESIGN: -- N=110 participants. -- I do NOT have groups – everyone in the study does the exact same thing. -- There were 3 waves, each separated by 2 days. Participants completed a survey at each ...
2
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2answers
38 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
1
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0answers
10 views

Why would someone use regression analysis to compute weighted variables?

I stumbled upon a measure that uses multiple regression analysis to compute weighted variables, instead of factorial analysis or other more common methods. I have a feeling this is just bad statistics ...
1
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0answers
21 views

Help analyzing data ranked on a scale

So, I thought it would be interesting to try an experiment with my family. I baked 13 different kinds cookies this year, and then told my 8 family members to rank from each cookie from 1-13. Is there ...
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0answers
6 views

CART model: Performance differences depending on preprocessing

I am trying to fit a CART model on a spam dataset, trying to predict "spam" or "ham". Usually, I work with the "tidy" packages for preprocessing; however, I now learnt about another way in a tutorial,...
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0answers
15 views

How many factors are there in EFA?

I have been adapting scale. CFA have not confirm structure. Therefore, I did EFA. EFA result showed that scale has four factor. But one factor has one or two item. How is this result interpreted? I ...
0
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1answer
20 views

Survival Analysis Time Dependent Variables

I am currently learning Survival Analysis for a project and I struggle a bit with the notion of Time-Dependent Covariates. Let's take the following example: I would like to know what is the ...
0
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0answers
10 views

pretest-posttest for one group and 3 dependent variables

I want to ask what is the statistical analysis that work with my study? I have just one group of student and pretest-posttest. Also there are 3 dependent variables.
0
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0answers
13 views

Why would the mean and standard deviation of the first and second derivatives of a signal (e.g. EDA) be useful?

When analysing a signal, e.g. EDA, I intuitively understand why one would want to determine the mean and standard deviation of the signal. The mean would tell us the average value of the EDA signal, ...
0
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1answer
17 views

What kind of analysis?

Im doing a research about perceptions on terrorism. I will be having 6 different stories (each story with different ethnicity and group affiliation) that I will be randomly giving to participants ...
1
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0answers
23 views

Include group IDs in a model

I'm doing the PUBG challenge in Kaggle. I have a lot of variables in the dataset. Especially I have two variables matchId and ...
0
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1answer
26 views

How to consider a variable that has both random and fixed values?

I have an experiment in which we want to measure the effect of a medication on mean arterial pressure (MAP). We have 3 conditions for each patient: placebo (no treatment), fixed standard dosis (100mg) ...
1
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0answers
7 views

Adjusting a non statistically significant HR

I am doing a survival analysis using Cox Proportional Hazards regression analysis. At univariable analysis, the categorical variable of interest representing the treatment (x) is not associated with ...
0
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0answers
14 views

Correct way of calculating cohort-based daily retention metric

Background: I need to calculate retention of users observed in a system. I will use this metric to estimate the Bayesian probability of said system's retention levels in the future. This question is ...
0
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0answers
24 views

Different adjustment variable in logistic regression model

In a study, a reviewer ask me to add adjustment variable in my model. However, the variables he asking for are not all pertinent to add in my model (weak univariate association between them and my ...
0
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1answer
33 views

Why are variances of observed variables estimated in Factor Analysis / SEM?

Let's say we have one latent factor L and three observed variables X1, X2 and X3. From the variance/covariance matrix of X1, X2, X3, we create this latent factor that explains the most out of the ...
0
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0answers
33 views

Which test to use? Chi-sq?

I am trying to test kids behavior towards fruits (Banana, Apples, Pears, and Kiwis). At the entrance, two fruit packets (one on each side- left and right) were kept. Kids could take any one packet or ...
0
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0answers
11 views

Abadie Imbens (matching technique) number of observations: “nnmatch” command

I'm using the command for Abadie-Imbens matching "nnmatch". My co-author and I are wondering why the N resulting from this analysis is not smaller than the N resulting from using a more traditional ...
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0answers
20 views

Randomized Treatment within treated group

I don't know if this situation has a particular name. I'll just give the example and my question. Suppose we have two naturally concurring groups, $A$ and $B$. By that, I mean there is a naturalistic ...
0
votes
1answer
48 views

R : Which method should I choose for correlation analysis of between two dichotomous variables? and How to? [duplicate]

data example : variable a{1, 0, 1, 0, 1, 0, 1, 0} variable b{0, 1, 0, 1, 0, 1, 0, 1} can I use spearman method for this analysis?
1
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1answer
35 views

What statistical methods would be recommended

What types of statistical analysis should I use to questions like: 1st question. Have you had problems standing for longer than 30 min? possible answers: no problems - had to adjust to be able - ...
2
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0answers
31 views

Is Expectation-Maximization the right type of analysis (& if so, how)?

I have 118 microbes that I have tested at various concentrations of a drug that is supposed to kill them (0.1875 - 15). However, these microbes have mutations (A-H) which confer resistance to the ...
0
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0answers
20 views

What kind of conclusions can you make about a data set knowing its arithmetic mean, quartiles and standard deviation?

In the country I live in, by law, every employer (with some exceptions) must disclose this data about how much is paid for their employees every month (the data set): arithmetic mean, the three ...
1
vote
1answer
30 views

what statistical test to use in this context please?

I am a newcomer to statistics and am struggling to work out what statistical test would be appropriate to use in the following scenario: determine whether 'hours of sleep' is a better predictor than '...
2
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0answers
29 views

random effect Cox model [closed]

I am trying plot the dose-response relation between A AND B in a random effect Cox model. But I met an error output. I don't know what happened. Following is the example. ...
0
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0answers
25 views

Authentication using keystroke dynamics using a few samples

I have been involved in user authentication using keystroke dynamics for some time. Let me give some context on the problem. First-time users will write out their email and password in a form a couple ...
2
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0answers
18 views

Analyzing behavioral change: Comparing 2 measured weight curves to a model curve

I'm currently in the process of analyzing experimental data and would like to hear your opinion on the method I would like to use to test my hypothesis. I had an experimental setup where I recorded ...
0
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1answer
22 views

Survival analysis of a population - Proportional hazards

first time here :) here's my problem. I developed an agent-based model (ABM) that I used to generate some data that I would like to analyze, but I couldn’t find a methodology that I can be confident ...
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0answers
19 views

How do I approach analyzing the pass rate for a course last year compared to previous years?

I have the final marks since 2012 for a course taught over 1 year. This past year, 2017, a new curriculum was introduced for this course. Special tutors were also hired to help students with the new ...
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0answers
13 views

How to compare multiple collocations based on their Chi2 score? How to find synonyms using collocation analysis

my question is regarding collocation analysis (i'm using R). I have following data gathered from Polish corpus: ...
1
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1answer
103 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 ...
1
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1answer
16 views

People count regression analysis

I have data of number of customers entering a business and number of customers leaving a business every 15 minutes. I need to predict the number of people that will be entering and leaving the ...
0
votes
1answer
30 views

Inferential test for differences in frequencies between groups?

I would like to have your suggestions regarding the kind of statistical analysis that would fit the nature of my data. Participants have seen 12 videos, in each of which an emotion was conveyed and ...
0
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0answers
40 views

Can Failure Mode Effect Analysis (FMEA) method be used to find a cause of a failure?

In the research i am currently making, there is a problem in a company supply chain in it's supply chain (source) adaptability. I assumed that the main failure is "error in the company's system to ...
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0answers
688 views

How to read this ACF & PACF plots? [duplicate]

I am performing an interrupted time series analysis. I plotted the data and then checked for autocorrelation using ACF and PACF. ...
2
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0answers
146 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, \...
1
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1answer
40 views

“Examining the data” before analysis: I still don't know what I'm looking for

I am a recent graduate of a biostatistics program working as an analyst for health-related studies. We were taught to always "examine the data" before conducting an analysis by generating summary ...
0
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0answers
29 views

Without running an a/b experiment, how can I show the value of a new product feaure?

I'm an analyst at a consumer facing company working with a product team to understand what value their feature provides our users. There are 2 issues - 1) they ran an a/b test but didn't keep a long ...
1
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0answers
60 views

Experimental Design and Measuring a Rate of Success

Suppose you create an experiment for baseball players where you assign an extra batting coach (treatment) to a group of players and then use a control group of players who did not get the extra ...
1
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2answers
39 views

Simple Linear Regression Interpretation help

I am supposed to analyze a relationship and model of two variables. Here's what I got. the p-value indicates a relationship but the R-squared is tiny. The model does not look linear at all. How would ...
0
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0answers
57 views

glht for binomial gym results differ from glm coefficient results

I am starting now to study statistics and I am not used to glm. Moreover, I am just learning R code.... I am trying to investigate if there are differences in terms of "adverse events type" among my ...
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0answers
10 views

Structure coefficients vs. Standardized coefficients in DFA

Could someone give me a clear differentiation between standardized and structure coefficients in Discriminant Function Analysis (aside from standardized being the unique contribution to the function). ...
2
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0answers
24 views

What statistics can compare individual survey responses & others that were measured as a group (from which we need to extract individual responses)?

The organization I belong to studies indigenous populations through primarily survey research. One study for example aims to identify the relationship between culture and the evaluation of odors. We ...
1
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0answers
6 views

What tools to use to analyse real time data and also send automatic email notifications? [closed]

Looking for tools to analyse real time data (source files are .csv files) and need to send automatic data driven email notifications to users.