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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.

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Prerequisites for root cause analysis

I've been given a task involved using a root cause analysis model, what are the prerequisites for learning it?
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how to regress for common trend assumption

I have a database of applicants for a grant and their applications for each year. I want to know the effect of the grant on nr of publications. But first i want to perform a common trend analysis. i ...
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Utilizing ipfraking to apply post-stratification weights for a Community Based Survey in STATA

I am a community data analyst for a small non-profit in South Florida. We are cleaning and preparing a local community survey for analysis and need to apply post-stratification weights to the survey ...
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MTBF for a single failure

I have a machine for which I want to calculate the MTBF over a limited period of time. The failure rate is small and not constant. That is, I may encounter a single failure (or no failures) over a ...
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1answer
22 views

Split Plot Analysis Interpretation

This is the R output I was given for a split plot analysis. I think I'm on the right track with my interpretation, but I want to make sure. Q1: What should you look at first? If the treatment*year ...
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1answer
32 views

Can point-system be used for hypothesis testing?

I've created a point system for the bestseller's list (I've 52 weeks' lists).The list has 4 categories of genre (romance, thriller, fantasy, literary fiction). ...
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24 views

Can I force values to follow another distribution?

I am working on a problem where I have calculated a set of "quality scores" for different candidates/users. I'm not happy with the score distribution that results from this calculation and am ...
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17 views

Problem with Exploratory Factor Analysis for my 7 items measuring attitude on SPSS

My factor analysis using direct oblimin keeps giving me only partial results, stating 'Attempted to extract 2 factors. In iteration 25, the communality of a variable exceeded 1.0. Extraction was ...
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Which statistical analysis to use? Stata

So I've got this database that had people rank how much the like very light red, light red, red, dark red and very dark red cars (scale 0-10). My professor says that because it is an 11-point ...
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1answer
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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 ...
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1answer
86 views

Steps in the analysis of a survey data which measures the knowledge about a subject of a population

I have a survey to measure the level of knowledge of a population X on a certain topic. The survey consists of N categorical questions of several answer options with a single valid option (the ...
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Use time series analysis to analyze game players behaviours and interactions (in seconds & miliseconds)

I am working on a mobile game in which the player needs to respond to a quiz.. And i am storing the player interactions and behaviours during the game like : response time ,clicks , number of answer ...
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2answers
32 views

How to properly do a Survival analysis - Question about start times

I have a monthly report that lists transactional errors made by facilities all over the country. Each row is a single error and the columns represent descriptive information about each error (ID, ...
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Midpoint removal from 5-pt liker scale

I have removed midpoints from a 5-point likert scale instrument on my supervisor's advice. When I did some reliability analyses - SPSS showed that almost half of my cases were excluded. So we ...
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1answer
23 views

What kind of analysis to use for continues value data set [closed]

I'm new in the data mining field and I'm using RStudio to do the analysis. I have a dataset and I don't know what could be the best method to use. I've tried using correlation and I don't know if ...
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32 views

Do reaction times differ for different response types?

I have two different conditions (A and B) tested within-subject with a single binary choice trial per condition. In each of the two conditions, the binary choice is between old and new. My hypothesis ...
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2answers
74 views

Conducting a three-step Latent Class Analysis in R

I'm trying to conduct a Latent Class Analysis in R using the poLCA package, and I have now become stuck on two aspects of the process. I have conducted Latent Class Analysis separately for males and ...
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1answer
32 views

How to analysis

My research has three independent variables but some of the dependent variables act as an independent for my objective Eg. the type of stroke affects the outcomes of stroke and both are affected by ...
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32 views

Multiple Correspondence Analysis -Decision Making Index Stata

I am trying to make a decision making index using MCA. I am using 6 binary variables and the responses are whether the respondent makes these different decisions alone. I read once somewhere the MCA ...
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8 views

Which analysis method to use with multiple levels and repeated measures?

I'm fairly new to statistics, I have difficulty to choose which statistical method is needed to answer my research question. In the end I want to see if my analysis method makes a difference or not. ...
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What is the best test to use?

I would like to design a study that looks at the relationship between perceived competence and perceived helpfulness of website information for two separate companies. Say I asked participants to ...
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25 views

Log-rank test chi-square and z values

I start saying that I am not still skilled enough at statistics and I am just studying how to apply particular methods to my data. I run a survival analysis using by a statistical software. Looking at ...
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49 views

How to group my data properly?

I want to compare the (median) reading time for people of different ages. In the following chart, the X-axis indicates the age and the Y-axis indicates the number of people at that age. Clearly, the ...
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8 views

What type of analysis to perform?

I am working on in-vitro evaluation of efficacy of multiple antibiotics. I've selected 8 antibiotics with 3 concentration of each antibiotic applied with 3 replications each concentration and ...
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26 views

Is it appropriate/possible for me to use PLS regression for my problem?

Im currently writing a dissertation on the effect of cultural dimensions on technology acceptance. In order to collect data I have used a questionnaire with questions relating to technology acceptance,...
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How to analyse aggregated categorical variables?

I'm having trouble in how to analyse categorical variables which are evaluation scores with values from 1-5 where 1 is the worst and 5 is the best. The problem i have encountered is that these ...
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1answer
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type of analysis

I want to run an analysis looking at the changes of mean insomnia scores over time. I want to look at how these scores change (decrease/increase) over 3 different time points, however, the time points ...
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Using a supervised learning to compare two conditions

I've got to analyze data about two signals x and y using machine learning but am stuck with how to proceed. Conditions are: 1) signal x and y are known to be linked to one another, but no parametric ...
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1answer
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The significance of two categorical variables on students' scores

I am analysing a set of students' scores on a Maths test. My data set includes 41 students. I have the students' marks on each question of the test. I have the gender of each student. I also have ...
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Forming an ANOVA table without observed values (regression analysis)

Need some help in forming the ANOVA table without observed values. I only managed to find SST with the first line of hint, but do not know how to proceed to find SSTreatment or SSError. Any hint/...
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Statistics of Diff in diff with optimal group

I am trying to run a diff in diff to measure the impact of a feature. I want to run the experiment per geo region and I have 90 regions. To run a proper diff in diff I should split in have the ...
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1answer
26 views

Time series or Panel data

I gathered data on my variables for a single country but for over a period of 10 years. Is that panel data or time series?
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2answers
46 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 ...
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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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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 ...
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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 ...
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2answers
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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
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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 ...
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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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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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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 ...
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1answer
31 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 ...
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23 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.
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28 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, ...
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1answer
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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 ...
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25 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 ...
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1answer
30 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) ...
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10 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 ...
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16 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 ...