Questions tagged [research-design]

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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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9 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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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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56 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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20 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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11 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
33 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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65 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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21 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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17 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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28 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
104 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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27 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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12 views

How to design inclusion criteria to match groups?

I am currently working on a study with a population of mostly veterans with chronic spinal cord injuries (goal n=60, currently n=27). We decided to add a comparison group of able-bodied controls that ...
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22 views

Non replicated vs replicated field trial

I need to conduct a pesticide efficacy trial on avocados. I have been asked to describe two different trial approaches: replicated and non replicated. I have drawn the two trial design options. ...
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16 views

A question about power for a cohort study

In short, we are planing a cohort study, were we want to investigate the occurrence and the importance of a given event on response of a treatment. We expect the event to occur in about 2% of all the ...
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1answer
33 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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8 views

Correct definition of prospective repeatability study for study protocol

I'm going to submit a protocol at my local IRB for a prospective single centre study which is a repeatability study. In this study we will perform an additional sequence in magnetic resonance. How ...
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39 views

Signal detection theory: one-interval design (= yes-no task) and 2AFC design, test power and sample size

my research group and I read some more about signal detection theory and we were not able to find answers concerning the following questions. Therefore, we would appreciate your help very much! 1) We ...
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1answer
32 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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10 views

Policy change with fixed effects but no control group

In our master thesis we want to examine the relationship between consumer credit loans and housing prices in Norway. Especially regarding a policy change at the start of 2017 (limiting mortgage amount)...
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13 views

Econometric Models in Economic Development Theory

I have been reading some Economic Development and Policy Research papers and I realise there is extensive employment of econometric tools and models. For example, one of the papers used an Oaxaca ...
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18 views

Calculation of adjusted CDS spread changes in event study

I am conducting a study about the impact of credit ratings on credit default swap spreads for European Sovereigns. In the related literature, most authors use adjusted spread changes to account for ...
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20 views

What test to use with many groups and interactions

I am trying to design an experiment with impact of many factors on one variable, the basic idea is to measure variable A when facing factor 1, factor 2, factor 3, etc. Secondly I would like to ...
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253 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
41 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
45 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 ...
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1answer
34 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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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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20 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
228 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
146 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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34 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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34 views

Statistical Design Assistance

I come to you all with a (hopefully) relatively simple question. Sorry for any grammar mistakes, english is not my first language. Background I am creating an experiment that is building off the ...
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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 ...
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42 views

should I resample/downsample the patients in the control arms?

I have retrospectively collected clinical data of two sets of patients, one set with the diagnosis of tumor A (group A) and the other with tumor B (group B). There're 90 patients in group A, and 1100 ...
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1answer
145 views

Question about attributing change from a pre- to post- survey to the larger population if the respondents are different from time 1 to time 2?

I administered a front office staff customer service satisfaction survey anonymously to consumers at different mental health clinics. Then the front office staff at these clinics received a course ...
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25 views

How can one control variables but ensure that the population is representative?

Usually, you want to control variables within a study. However, you also want to obtain a representative population to the population that you're measuring. How can one even strike a balance between ...