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Questions tagged [methodology]

For questions about statistical methodology or choice of statistical methods.

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25 views

Sample selection bias and logistic regression

I am struggling with possible sample selection bias at the moment, and I was wondering whether someone has a methodological tip or possibly knows of fancy statistical/econometric tools I could use to ...
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9 views

Statistical methods for assigning weights based on rank differences?

I have encountered methodological problem in my pursuit of my master's degree, and I hope you can help! I know exactly what I want to do, but I do not know which statistical area this is related to. I ...
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1answer
24 views

Statistical uncertainty in average of continuous variable, where values are not expected to be the same

I have been trying to understand statistical uncertainties on measurements made, I have found many partial sources, but they seem to either deal with simply counting whether something happened or not ...
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17 views

Error/Confidence Interval estimation on very specific problem

I'm developing a method which estimates a value $t$ for a very specific problem. Assume that we have an individual $s$ with its associated data but where $t$ is not precisely known and a reference ...
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15 views

Correlation of phrases and answers to them

If I ask question in wrong forum, let me know, I'll delete it. I try find methods, methodology to create predicative model. Namely, I want to investigate the relationship between the sentences and ...
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21 views

ANN webpage classification based on visual segmentation: sample size and parameterization

I am trying to classify web-pages based on their visual layout. My application visits a categorized webpage, catches certain elements' bounding boxes (rect in web-element term) and label them. Label ...
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1answer
38 views

Is it methodologically correct to, in some specific situations, merge related binary variables into one continuous?

I have 10 yes/no binary variables regarding different types of economic risks associated with running a startup. I have a database of around 100 different startup companies evaluated on each of those ...
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16 views

What is the best discription for this method and design?

I have a slight problem and can’t get a straight answer from the My college stats tutors. I’m looking for some clarification on a study I am going to propose. Once I finish chap 3 and IRB. I have a ...
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1answer
25 views

What type of Mixed Method is this?

Really confused about this as have never done a mixed methods study before. The study in a nutshell – participant does brief test battery, then is interviewed for 15 mins. Some interview questions ...
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58 views

What are appropriate statistic tests for top-down and bottom-up knockout experimental designs?

This concernes a two staged experiment on cell toxicality. A: Aim is to find the lowest concentration of the toxic agent 'CTA', that kills the target cells with at least 99% security. Use of lowest ...
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1answer
274 views

Objective vs. subjective Bayesian paradigms

What is the difference between objective and subjective Bayesian paradigms? What objects or procedures do they define or interpret differently? Is there any difference in their choice of methods?
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17 views

What study design should be used for a prevalence study and risk factor association

I want to estimate the prevalence of Hypertension in Diabetic patients and to check whether the prevalence is different in smoking and non-smoking people. Can someone help how to design this study ? ...
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1answer
32 views

Combing logit and linear regression

I am looking for a proper method for my research. I want to analyze left-right political position of a person. My idea is to combine logit regression with a linear regression. Logit will decide on ...
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22 views

What method would you use to identify risk factors at the individual level when you only have outcome data at the household level?

Say you wanted to identify the net effects of individual-level variables associated with smoking. You have a simple dataset of single-person household (i.e. individuals living alone) and their traits ...
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26 views

ANOVA or test to distinguish treatment groups [closed]

I have two lots of questions which should be pretty straight forward to solve with an ANOVA or as studies previously used Wilcoxon-Mann Whitney matched pairs. However I'm not quite sure what to tell R....
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1answer
60 views

DNN methodology and feature concatenation

I'm using someone else's job and I have a question that I cannot solve. This work uses a DNN to match an electrical resistance to a bend angle. This is not very important, just for the context. So,...
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29 views

comparing CNN vs other classification methods

I working on a classification problem. I have created Python code that takes certain labelled input data. This is then converted into two 2 dimensional arrays. The first array is an input array of ...
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104 views

SEM with skipped questions in survey

I have conducted a survey on social media. One of the questions asks if you ever use a chatforum. If they answer "no" they skip question 2-5. Thus, I will have missing data despite that they are not ...
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28 views

Compare efficiency of several linear combinations of random variables

I have the following linear combinations of (non-independent) random variables: $Y1=X1+X2$ and $Y2=X1+X2+X3$ With the following general formula, I can calculate the variance for combinations $Var(Y)=...
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1answer
61 views

What is the appropriate statistical analysis?

We are doing a study where we have measured the contractile properties of the lumbar spine muscles. Each individual (N=34) was tested at 12 different sites along their spine. 6 sites (vertebral levels)...
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2answers
79 views

Survival Analysis or Not?

I am conducting an analysis where the outcome is time to an event in minutes, with no censoring of the event, and in this situation the event always occurs. The distribution of the outcome variable ...
2
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2answers
48 views

which non parametric test to use?

I'll start with saying I am not an expert in stats and had some basic knowledge of Anova but was now told to use the nonparametric test in my project and I'm lost. My design: I have two groups, low ...
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0answers
14 views

Reducing Least Squares Regression Error in Predictive Model

I have been iterating on a predictive modeling framework for my marketing team to predict the output of leads we can expect for each day remaining in the current month. I started the process by ...
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1answer
430 views

Li-Mak test for GARCH residuals in R

I have conducted a realized GARCH model and want to test for ARCH effects using the Li-Mak test as I have read that it is the best one for this purpose. I am struggling on the question if residuals ...
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39 views

Analysis of Pre-post Likert-type scales: Intervention vs. Control group

I gathered the following data: Intervention group (n= 24, received treatment): pre- and post- scores of different psychometric questionnaires Control group (n=23, inactive): same questionnaires, same ...
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1answer
86 views

Enter and stepwise regression

I found a significantly predictive model using the enter method of regression. Is it ok to then go on to perform a stepwise method of regression (within the same report, and report the results of both)...
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1answer
42 views

Q: What method to use for cluster analysis?

I am in pickle when it comes to choose what statistical method I should be using for my data.. At the moment I am working with analyzing clonal heterogeneity in tumors using a new approach. Basically ...
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50 views

Getting insights having different customer segments and question with hierarchy

I'm making a survey to my target market and trying to get insights with SPSS. I separate the surveyed by the number of employees: +10 employees 10 to 50 employees +50 employees) One of the questions ...
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24 views

Compare global and between group variability of 2 mixed effect models

We are comparing some features of our product against a competitor. Since the product is produced in lots and we have proof that ambient temperature is relevant for its functioning we used a mixed ...
3
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1answer
66 views

best-worst ranking: do all items have to be blocked together at least 1 time?

Here there are instructions to build Max-diff (or Best-worst) ranking questionnaire: In an ideal world, a MaxDiff experimental design has the following characteristics, where each alternative ...
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0answers
25 views

Most “correct” method to reveal preferences over large set of items

That probably is too 'practical' question so I will be happy to re-formulate it in more abstract terms if needed. I have a list of n items (say, 30) and an audience, larger than n (say, 200). I am ...
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14 views

What is the most correct method to let respondents choose top-3 most preferred items from 30 in a survey? [duplicate]

We have a list of 30 items, and we would like to choose top-3 most preferred by our audience. What is the best (or most well established) method to do it? Does MaxDiff make sense in this case?
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13 views

Can anyone recommend me any literature that discusses the advantages/pitfalls of using proxy measures and additive indices?

Trying to find some literature on the topic (especially as it pertains to social science research) to increase my theoretical understanding. Any recommendations will be much appreciated. Thanks!
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60 views

What statistical analysis to use for a diary study?

I was wondering which statistical strategy/technique is best for my research, which is a diary study. I have developed a theoretical framework, a mediated moderation model see figure below. All ...
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1answer
111 views

Are exact binomial or poisson confidence intervals ok for prevalences?

I want to get confidence intervals for the prevalence of a certain condition. I think it is correct to model the phenomenon with a Binomial distribution Surfing CrossValidated I see a bunch of ...
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1answer
50 views

Is there a common/standard procedure for transforming raw data into models?

I am asking this out of curiosity, as I can't seem to find articles that describe a simple, yet standard procedure in turning raw data into models and valuable insights (i.e. visualization). Is there ...
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2answers
56 views

Paradox of making conclusions too fast

I would like to ask what method do you use in statistic, to avoid making conclusions too fast. For instance. Country natural resources vs poverty Observing Nigeria for example, may lead you to ...
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0answers
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When doing nested cross-validation, is it better to use n-fold or random sorting?

There are different methods for performing the outer part of nested cross-validation (i.e. outer-cross-validation) for estimating overall generalised expected classification accuracy, e.g.: Use the ...
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1answer
201 views

Calculating variable importance in a multinomial logit model

I am analysing data from a discrete choice experiment from a sample of 1000 responses where a respondent were presented with two cards and had to choose their preferred option. In the survey there ...
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0answers
24 views

Comparison of two treatments when sample is heterogenous

I want to compare two treatments A and B. There are four groups: Group 1 receives only treatment A Group 2 receives only treatment B Group 3 switched from treatment A to B Group 4 switched from ...
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0answers
37 views

When multiple c,g hyper-parameter values yield the same accuracy, how can I choose which c,g is better?

[ Not a duplicate: First of all, my data set is balanced, so accuracy is a reasonable measure of performance. I.e. any value over 50% means that the result is better than random. ] [ Not a duplicate:...
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1answer
213 views

Quantile regression for count data & the extended log-F family

I'm working on a project where we want to estimate how many of a particular bird species there potentially could be in every 10-km square in England. For this I want to use quantile regression to get ...
0
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1answer
24 views

Given a word (not in a sentence) how to find the category?

I have the following requirement: I get a list of words. These words come from table-like structures (they do not have table column headers). They are not well-formed sentences. Example input: ...
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1answer
21 views

Statistical methods for determining probability of a 1 from a data set of 0's

I have been thinking recently if we assume that there is a finite population and one was taking some sort of survey. Something where it was a yes or no question which for these purposes, I am going to ...
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1answer
187 views

Determining the best evaluation metric for linear regression

I'm trying to evaluate the model results that I got from linear regression. For some models, I get a high r$^2$ (good) [89] but also a high mse (poor) [1000]. and in other cases for some models I get ...
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0answers
202 views

Comparing two rates: Poisson test or Fisher test (or logistic regression)

I have a setting in which I want to compare the rate of two count quantities under two different conditions. This can be achieved in two ways: either using a Poisson test, comparing the cases and ...
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1answer
33 views

Methods to quantify if the sum of two variables is close to a constant

In my data set, each individual has two properties, a and b. It seems that a + b is close to 10. Which statistic method could I use to test if this is true? I ...
0
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1answer
261 views

Conjoint analysis on split-sample?

I've received survey data from a sample of 1000 responses from a choice-based conjoint analysis where a respondent were presented with two cards and had to choose their preferred option. In the survey ...
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2answers
282 views

Extracting power of a power law from data

My question is more about the methodology. Assuming in some experiment we have measured quantity $y$ per each unit of time $x.$ So $y$ and $x$ form our data set here. Moreover, we know that they are ...
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1answer
38 views

How to handle non-detects in duplicate samples

I took two separate water samples (one sample per bottle) in twenty one river locations (n=42). For the purpose of this question I am calling the two bottles duplicates. I am trying to show how ...