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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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11 views

Time series forecast - which models to use and how to cross validate?

I am working on a project to analyse and forecast time series for sales and revenue of a client. There are various models that i want to test for accuracy purposes - namely Holt Linear Method, Holt ...
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5 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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9 views

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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11 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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34 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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7 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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18 views

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
13 views

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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32 views

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
28 views

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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0answers
14 views

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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4 views

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
23 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
35 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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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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18 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 ...
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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 ...
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2answers
64 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
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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 ...
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0answers
25 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
7 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
16 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 ...
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1answer
22 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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15 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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20 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
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 ...
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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
29 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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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 ...
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0answers
15 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 ...
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1answer
42 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 ...
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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 ...
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1answer
51 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?
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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 - ...
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0answers
35 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 ...
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0answers
24 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 ...
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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 '...
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0answers
32 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. ...
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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 ...
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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 ...
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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
19 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: ...
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1answer
155 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 ...
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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 ...
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1answer
31 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 ...
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0answers
83 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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1k 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. ...