Questions tagged [research-design]

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What type of relationship is shown at this table? randomization process? [closed]

I need help. I can't figure out the questions on this part. The study is called Randomized Crossover Trial of Two Treatments for Sleep Apnea/Hypopnea Syndrome by Engleman et al. Edinburgh. I am still ...
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18 views

Conceptual framework for predicting customer probability of changing to online purchases

I'm likely to be tasked to create a predictive model for predicting if our customers will start using our online store. I have 2 frameworks to do it. I'm pretty certain of one framework and very ...
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1answer
18 views

measurement error in categorical dependent variable

Let's just say that in my field several studies find some significant associations between a variety of CEO attributes and some organizational policy (binary categorical dependent variable). Many use ...
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1answer
29 views

What is the right machine learning research methodology to compare two neural network approaches against eachother?

I am new to machine learning research, and I have a general question regarding how to compare different models on the same data set. How does a top researcher do this, and what is expected from a ...
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8 views

Ablation Study training until when?

Given that deep learning models can take weeks to train, having to train 20 different models becomes infeasible when performing an ablation study. Are there some formally accepted common practices on ...
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14 views

How to test whether group membership type 1 predicts group membership type 2?

I am planning an experiment in which I will categorize participants into groups based on performance on two tasks. Based on task 1, participants will be categorized into a "high performer" ...
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28 views

Relating Temp / Size / Time to Mortality Rates from Catch and Release Fishing

I am conducting a fish catch and release mortality study and have hit a wall with the statistics portion of my report and could use a nudge in the right direction. I am trying to relate a few ...
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1answer
33 views

How to tell if one value is different from another?

I have a dataframe made up of counts in different time periods as so: ...
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5 views

Number of Tests necessary for object detection (test/experiment design)

I want to find out the number of tests necessary to validate certain performance characteristics of an object detection system with a certain confidence. The system just detects if a relevant object ...
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84 views

Imposing a distribution on a dependent variable to increase variation in the dependent variable - disaggregating data

The question I have essentially has to do with dis-aggregating data, based on a known distribution of the data with respect to a certain variable. It has some resemblances with post-stratification, ...
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10 views

Comparing rates of hospital admissions or refusal rates year against year

I am trying to design a study for introducing a treatment and seeing if this would change rates of admission or leaving the hospital against medical advice. I would compare Jan-Dec 2020 (no tx offered)...
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17 views

What statistical analysis should I use for this proposed study?

The aim of this study is to determine the impacts of monolingualism and bilingualism on the literacy skills of primary aged children with ASD. This experiment is a between subject’s design as it will ...
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1answer
43 views

Crossing Frequentism and Bayesian Analysis

Has anyone considered giving the posteriors of an analysis a sampling distribution and seeing where, methodologically, things could go from there? For details, check out: https://sdba-stats.weebly.com
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22 views

Evaluate change in participant population characteristics

The Project I'm doing an analysis concerning a major drop in service uptake since the beginning of COVID. I have access to administrative data for those using services, including relevant demographic ...
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1answer
35 views

Bayesian design for a small sample and how to include informed priors

I am new to Bayesian approaches so thank you in advance for your patience. I am looking to investigate the influence of a specific type of brain lesion on the lateralization of verbal memory in a data ...
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21 views

2 x 2 x 2 design

I'm doing a 2 x 2 x 2 design. To be specific, it's a 2 (BETWEEN-subjects variable) X 2 (WITHIN-subjects) X 2 (WITHIN-subjects) factorial design. And three Dependent Variables I know MANOVA is the one ...
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23 views

What is the appropriate way to analyze data subsetted into bins and compare those bins across conditions?

I am wondering how to approach the analysis of a data set that I've obtained. I have animal trajectories moving toward a target under multiple experimental conditions. One of my analyses was to look ...
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20 views

Are these the major response variable types?

I am a biologist with an interest in experiment design. I recently refreshed my memory about what kinds of response variables that are possible, and made this chart (see jpeg). I would like feedback ...
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5 views

selecting sub-groups on one variable before correlating with another

I am wondering what the potential pitfalls are of the following approach. I want to check whether a neural measure is related to a questionnaire measure. I know that this is rarely the case (...
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19 views

What is the best statistical analysis to use for the below example (psychology research)

I am currently choosing the best statistical design for my Psychology MSc research. I am looking into the effects of BMI (underweight, normal, overweight), SES (Low, high) and Ethnicity (Categorical) ...
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10 views

Feature and Attribute Balanced Train-Test Split for Facial Emotion Recognition (using a CNN)

I am trying to develop a CNN that is able to classify whether some musician is in a certain emotional state or not (i.e. binary). For this purpose, I have gathered and labeled videos using CVAT which ...
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2answers
48 views

How to do meta-analysis of diagnostic tests with only sensitivity and specificity?

I am a junior physician, and I've run into some problems with the meta-analysis of diagnostic tests and I was hoping to get some input. Some background: Aside from my undergraduate statistics courses ...
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19 views

Research area about - Forecasting time series with added items

I'm wondering is there any time series research area about the change of forecasting with added items. For example, in the prototype below, when we check each recommended item, the forecast about ...
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28 views

What kind of regression to run when treatment occurs at different time periods?

I'm working on a regression analysis where I'm trying to estimate how a neighborhood's population growth varies as a function of the amount of land area dedicated to pocket parks (independent variable ...
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33 views

Would a repeated measures MANOVA be appropriate for a 9DV, 2IV within subjects study design?

I am trying to get an estimate of participants to strive for in my study. Being rather new to the research and stats scene, I was hoping the community could help me out a little bit? The study has 9 ...
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8 views

Repeated Measures ANOVA or MANOVA

I am studying the effects on an intervention on one group of individuals two times, before and after intervention. I am measuring social skills using a rating scale. The rating scale has an overall ...
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7 views

Method to find differences between two groups of data (High and Low Error)?

I'm looking to find differences in the conditions experienced during data collection, that might be attributing to error in observation versus our "true" quanity. Brief description: I'm "collecting" (...
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1answer
153 views

Real noise modeling/ noise map generation (image processing, deep learning)

I am working on a project with really noisy images. I have trained a detector that can detect the characters but fails in some cases (noise is high). So far I have gone through many denoising, ...
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1answer
32 views

Why linear regression is widely adopted given its (sometimes) poor prediction

Linear regressions are in nearly every paper I've read. The authors always model the response variable as a linear combination of independent variables without regards to how the data is actually ...
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24 views

Testing whether the study design has an effect on the outcome variables – Which analysis is appropriate?

I have currently run a pilot study in order to check whether my somewhat complicated design has any effects on the outcome variable. However, I am not sure how to go about this and would like to ask ...
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1answer
96 views

Formulating Null and Alternative Hypotheses in a Regression Model

I have a simple question regarding formulating research null and alternative hypotheses in a simple econometric regression model. In my research Hypothesis, I expect X to negatively affect Y (from ...
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12 views

Is this the right way of using the Likert scale on test results?

I would like to know if this is how to apply the Likert scale on test results: I will divide the score (25 points) into 5 levels. First is those who got 0-5, second is 6-10, third is 11-15, fourth is ...
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1answer
8 views

Statistical test for change in traffic flow at border crossing point

I have an assignment, where I'm supposed to measure whether an intervention at a border crossing point will an effect on the traffic flow. We have a total of 7 border crossing points and we ...
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2answers
35 views

What to do when there’s no statistical test for this type of data?

I am looking at the effects of resistance to a drug intended to increase serotonin levels on the course of depression. Basically, every participant (N=20) takes a pre measurement of serotonin levels (...
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1answer
14 views

Combining results of two studies due to incomplete data

I am doing a study looking at the effects of a certain virus in rats. We are looking at certain concentrations of bio markers in the blood. I came into this project part way through and no power ...
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1answer
69 views

Model selection with low N?

I've got a study which is kinda messed up by the design...Turns out I ended up with about 50 patients of which 80% have the outcome and 20% don't (binary outcome). I've been turning in my bed for the ...
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1answer
1k views

Advantages/disadvantages of fractional factorial design vs completely randomized design

I'm new to the design of experiments (DoE) and will be running a screening experiment to estimate the effect of a large number of binary independent variables (approximately 10) on a single continuous ...
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16 views

What conclusions can we draw from different correlations between IQ scores between subjects belonging in different groups?

I was reading a presentation where research was quoted according to which children and parents who live together have IQs that are correlated with a correlation coefficient of 0.42 while children and ...
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1answer
128 views

How to calculate the sample size for a categorical independent variable with a dichotomous dependent variable

Suppose that in a large population group you have 5 different ethnic groups, and you wish to calculate the prevalence of a disease in each ethnicity(percentage of people in each ethnic group having ...
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2answers
97 views

Can a cross-sectional study use incident cases?

I am struggling with the epidemiological definition of my clinical study design. Looking at the literature I take it that case-control studies are retrospective (i.e. you must look back on the ...
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15 views

Is a null hypothesis which requires a minimum performance on a predictive model testable?

Given: A null hypothesis which requires a specific performance, which can be directly measured, is testable. Is a null hypothesis which requires a specific performance on a predictive model testable? ...
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1answer
71 views

How to deal with treatment effect at state level but observations at school level?

I have a panel of schools and I want to estimate the effect of a state level policy on school level outcomes (all schools in a treated state are treated). I can't use a fixed effects model since the ...
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2answers
57 views

Conceptual interpretations of predictive versus causal modeling

I'm a relatively non-technical clinician. And I recently came across an excellent paper paper (Schooling & Jones, 2018).The authors essentially implore biomedical researchers to use non-ambiguous ...
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2answers
486 views

Is there a difference between controlling for population size directly vs. putting variables in per capita terms?

I want to look at the impact of a number of factors (e.g nutrition, alcohol sales, GDP, etc.) on mortality. I have a dataset with 10-30 years of data on these variables aggregated at the state level. (...
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1answer
23 views

Comparing 3 means from 1 sample

I'm trying to compare mean interest levels of 3 products. The same sample was asked about each of the three products. How can I test for equal means among the three products? Other information: ...
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19 views

What type of research design is this?

I would like to work on a study regarding satisfaction level of of the students on school services. I am planning to conduct a survey. After I'll get the survey results, I would like to interview few ...
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31 views

Is causal relationship between two variables a theory?

I was asked if Y causes Z a theory, and I noticed that I have a gap in my knowledge on that. I know that theory could be causal, descriptive or predictive in its explanation. However, a theory is an ...
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1answer
113 views

Is most published research indeed false?

I have come across (Ioannidis, 2005) which explains several reasons (mainly statistics-related, that's why I post this question here) to justify the claim that most published research is indeed false. ...
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1answer
38 views

Suggested books to study statistics [closed]

I am doing a research that requires me collecting and analyzing data samples in order to identify if there is correlation or no with respect to some parameter. I am looking for the best resources to ...
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38 views

what type of research design should I choose?

I am trying to do a research proposal where I planned on doing a pretest-posttest experiment on 2-3 groups of subjects (measure baseline indicators of anxiety, depression, self-esteem, body ...