Questions tagged [methodology]

For questions about statistical methodology or choice of statistical methods.

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11 views

Is there a KNN method, that uses some sort of modell to predict weights for the used predictors?

Imagine a situation like this: You want to predict variable high (metric) by variable weight (metric) and ...
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1answer
23 views

Would “correcting” for patient characteristic in a cohort study always strengthen the study?

If we are doing a cohort study and investigating whether a variable has an effect on an outcome (say tumor size on nausea), and we run a regression (or chi2) with nausea as a dependent variable and ...
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108 views

What is the difference between ANOVA and logistic regression using two groups?

So just correct me where I go wrong, but my understanding of the differences between ANOVA and regression analysis is that ANOVA is comparing two independent groups while regression is used on one ...
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39 views

Disadvantages of “moving window ensemble” approach?

Assuming online/incremental training is not available for a particular algorithm, and assuming that you have a stream of training data that may or may not change over time (eg log data), what are the ...
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33 views

Theoretically, does deep learning defeat all other statistical methods in predictive modeling?

I am a student of statistics/machine learning, just beginning to understand a bit about different methods and predictive modeling, but this question has been bothering me for a long time. We learn ...
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28 views

Modelling resource selection in savanna ungulates

I am amidst an analysis of an 8 year data set that was collected from wildlife surveys over an 8 year period for my MSc thesis. 2 surveys were conducted each season for the three discernible seasons ...
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7 views

Statistical bias/methodology question about interaction test in a retrospective survival analysis

I have a question relating to statistical bias. Here is a summary of my study: Study design: Retrospective cohort Patient population: Melanoma patients getting immunotherapy Exposure of interest: ...
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20 views

If the total population consists of 6 retail groups, and I only manage to secure permission to run my survey from four of them, how valid is my study?

I am a first-time post-graduate student in an apparel design field, and I don’t understand statistics very well. I am doing a study on the adoption of 3D apparel design software by major apparel ...
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10 views

Define optimal Data Volume for Model Development Population?

I would like to ask and learn some approaches, analyzes about representativeness of modeling data. I want to know what is the optimal date range for model development population? I want to ask that ...
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121 views

Why don't people trade significance level for power?

As a convention, we have a lot of studies whose significance level is $0.05$ and a power of $0.8$. However, it is extremely rare to find a study whose $\alpha = 0.2$ with a power of $0.95$. From my ...
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42 views

What's the difference between using a composite null and running a power calculation for minimal effect size?

Probably a weird place to quote, but I just stumbled across this discussion on Reddit, and one of them said (with typos fixed): The effect size in a power calculation has no relationship whatsoever ...
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58 views

Time Series Classification and Survival Analysis for Forecasting with Bayes propability (for R)

I'm not sure that I posted in the correct forum. If it is wrong, tell me where should to ask my question. i found this article, https://www.academia.edu/36173525/...
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53 views

Setting event window in Princeton event study example

I'm running an event study using the well-cited Princeton example (https://dss.princeton.edu/online_help/stats_packages/stata/eventstudy.html), but I'm confused about the timing of their event window. ...
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23 views

Test correlation/dependence of many variables on one continuous variable

I have 9 individuals, each with 4640 dependant measurements (gene expression data), and one more measurement (percent of blood cells infected). The data frame has the individuals as columns and ...
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12 views

Comparing 1 group and multiple variables

Hi Guys my sample is 10 female hockey players and my project aim is assessing the effect exercise has on VOMS ( visual ocular motor screening test) for concussion. The test is a seated test comprised ...
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37 views

Multilevel, multivariate meta analysis with dependent effect sizes

I’m doing a meta analysis to find the connection between environmental fluctuation and fitness performance of organisms. I have collected data (844 Hedge’s g mean difference effect sizes ) from 43 ...
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18 views

generalized linear mixed model - model specificating + testing

I would like to examine, if the wording of a person described in a short story (1.”person”, 2. “homosexual person”, 3. “lesbian or gay person”, 4. „gay or lesbian person“) has an effect on the gender (...
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17 views

How to assess “reliability” for a non-stationary time series compared to a reference

I have two arterial pressure measurement devices, one of which is the reference. My goal is to assess reliability compared to the reference and the variables (demographics, passing time, etc.) ...
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36 views

Question regarding statistical methodology that involves logistic regression

I used following simulated data using R to demonstrate my problem. require(lmtest) require(splines) x=rnorm(20 ,0,1) y=rep(c(0,1),times=10) Although my simulated ...
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33 views

How to measure correlation between two groups of variables?

I have a data set that contain 75 variables of football players . These 75 variables basically measures two different types of information. 30 of those variables related to bio metric information ...
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1answer
130 views

Which method is correct for calculating total deviance explained for boosted regression trees?

I have the following output from a boosted regression trees model and I would like to calculate the total deviance explained. ...
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1answer
27 views

What type of statistical analysis should I use?

I have collected data for 30 patients for a certain test. This test was administered at 6 different but consistent intervals, and each test for each patient has lots of variables. If I want to do an ...
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1answer
79 views

Statistical test for multiple reponses?

I ran a survey and one question was to indicate which accommodation (hotels, apartment, b&b, ...) respondents prefer when travelling. Thery were allowed to select more than one option. The survey ...
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1answer
55 views

Kaplan-Meier method or estimator?

This is a really basic question. I say Kaplan-Meier estimator and always tell people to say estimator and not method or methodology. However, I've seen a few places where statisticians also say Kaplan-...
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1answer
191 views

Analysis of count data with percentages

for my master thesis I count and identify sediment grains. In total I have 82 samples from 3 different gravity cores. I divided the sediment components in 11 groups (Quarz, Mica, Opaque, Aggregate, ...
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24 views

Compare sales data over time in sequence

I am very new to stats, please advise how should I approach to solve the below problem. I have data like : My objective is to see how customers are spending from one Quarter to the next Quarter. I ...
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23 views

Testing moderation hypothesis in regression discontinuity analysis

I am doing a regression discontinuity analysis in R (using the rdd package) and I am interested in testing a moderation hypothesis. I think that the effect of the treatment will depend on a third ...
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1answer
58 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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43 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
40 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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20 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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23 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
41 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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22 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
26 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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63 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
520 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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19 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
40 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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27 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
85 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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35 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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134 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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43 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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94 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 ...
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2answers
53 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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1answer
689 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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51 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 ...