Questions tagged [research-design]

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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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5 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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6 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
67 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
26 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
23 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
33 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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6 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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11 views

Where does this multiple testing scenario arise?

Consider $n$ hypotheses $H_1,H_2...H_n$ such that the test sites are arranged in order so that, for example, $H_j$ is "closest" to $H_{j-1}$ and $H_{j+1}$. My question is, are there real life, ...
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16 views

question about sampling frame and target population

hi guys I need some help with regards to understanding sampling frame and target population in the below situation: "Given the objective of understanding the preferences of younger teens age 15-20, a ...
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13 views

Retrospectively reviewing a scoring tool?

I was asked to try Cross Validated instead of Academia with this question so I hope you welcome it: I had a study that had a problem in which we retrospectively evaluated a risk score by looking back ...
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19 views

Experimental condition is very different from control condition

I'm studying how transitioning between experimental wealth levels affects distributional preferences (generosity). I will do this with the help of a Dictator Game. Participants will transition within ...
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20 views

What type of ANOVA or T-Test can I use for this data?

I am not very familiar with using statistical treatment and would like to ask for some help. We are conducting a study to test our constructed device and ran an experiment in which its transmitted ...
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5 views

Merging dramatically different data sources

I want to analyze some data that asked the same set of survey items, but across dramatically different samples (all demographics and most other variables are statistically significantly different ...
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1answer
61 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
432 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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15 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
33 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
67 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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30 views

Is this study design sufficient to make causal claims from a multiple logistic regression model?

I have been tasked with designing a study for our sales team to estimate how different factors impact the success of prospects converting to various stages of our sales pipeline. To provide some ...
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92 views

Likert Scale / Chi Squared Test / Pre-Post Design Question

Super junior stats person here. I have a dataset I am looking to analyze properly. I have administered 2 surveys, one pre and one post. They may or may not be the same participants (was distributed ...
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12 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
68 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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21 views

Study Setup for a research project

I have 180 observations that were collected in a healthcare environment. The observations were identified in a prospective manner. Outcomes to be measured are accuracy of group A assessment when ...
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15 views

Heterogeneity in pooled cross sectional data

Hey I'm trying to estimate the effect of minimum wage changes on unemployment using data from the American Community Survey. Since the ACS is pooled cross sectional data, the sample which is ...
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2answers
36 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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6 views

Excluding a feature when creating model to detect bias in outcomes?

Here's a hypothetical example. Let's imagine I am trying to determine if my hiring process is biased against Females. The way I want to calculate "bias against Females" is by ensuring the positive ...
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2answers
203 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
22 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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18 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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29 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
107 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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28 views

two sample t-test for between group design?

my IV is the used software (there are 2 different software) I have 6 tasks that the subject needs to solve. I measured the completion time (ms), error rate (%), and success rate of solving the task. ...
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7 views

Abbreviated repeated measures factorial design - not everyone takes all conditions

We are planning a study in which participants are shown profiles that vary across three factors with 3 x 2 x 2 levels. We don't want to do this fully between-participants, but also don't want to give ...
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1answer
34 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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1answer
37 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 ...
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339 views

Neural Network for the Famous Black-Scholes Equation (1972)

The price of an option (in finance) is given by the famous Black-Scholes equation. I would like to design a neural network to predict the price of an option. Basically the inputs are the attributes of ...
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1answer
44 views

Data analysis mess! Huge data set, 2 factors with 2 levels each, but the levels are the same

To explain the hypothess a little bit: The factors would be emotional words and neutral words; the levels of both factors are left and right visual hemifields. The data is the participants response ...
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1answer
58 views

Statistical analysis, repeated measures t test or anova? Trouble with input when running any test

I've tried using google sheets/excel, but I can't figure how to run a 2 factor without repetition ANOVA (if that's the appropriate test for this data set). I think it's the way I set the spreadsheet ...
1
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1answer
36 views

When you have multiple replications of a study do you combine the data or analyze separately?

Assuming that I have multiple replications of survey data, each one with exactly 1000 unique participants, do I run statistical analyses by combining the data into one large set of 3000 participants? ...
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28 views

What is the appropriate analysis for this type of repeated measures multi-binary data?

There is a popular theory within psychology that certain emotions will trigger "prototypical" facial expressions defined by the simultaneous contraction of specific facial muscles. For example, if a ...
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0answers
21 views

How to correctly plan for Missing Data in Longitudinal / Repeated Measures Design?

Using an hierarchical questionnaire for a longitudinal study, I face strict constrains in how many items can be processed by each subject per week. The questionnaire contains 51 Items in total, but ...
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1answer
351 views

Regression with mostly binary and categorical variables in R

I am looking to run regression using a variety of predictor variables: Chemical exposure (1 or 0) - variety of chemicals but all are binary predictors, Illness diagnosis (1 or 0), and TBI severity (0 ...
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1answer
173 views

What is a good machine learning academic research workflow/tools? [closed]

I'm interested in ML research and want to get some insights into how its done in practice. In particular: What kind of data are you dealing with? How are you dealing with hyper-param optimization? ...
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35 views

How to measure the difference between the results of 2 T-tests?

For some context, I am currently trying to come up with the right type of research methodology for my masters in education and my thesis is basically comparing the difference between performances of ...
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15 views

Any downsides in giving a participant A and B then compare the results?

Almost all the experimental design studies that I came across randomly separates participants into bucket A or B. Then they study the effects to identify a causal relationship. Are there any ...
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25 views

Variables common to all individuals in a panel

I have been tasked with evaluating the efficiency of different marketing tools for a microfinance bank. I have a panel of seven individuals (seven districts of Tajikistan) over 17 months. Dependent ...