Questions tagged [treatment]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
7 views

Average treatment effects on the treated (ATT) and Average treatment effects on the untreated (ATU) based on Endogenous switching regression results [closed]

Hello, I am using Tobit 5 model (endogenous switching regression) in R software to assess the impact Variable Y on X with Z(treatment)dummy variable. I have to searching for a while now how to ...
0
votes
1answer
34 views

Can ANOVA be run for groups with n=3 observations (R)?

I have an experiment comparing multispectral data for 3 different varieties of crops with 4 different fertilizer treatments. The experimental design is a randomized-complete-block design, with each ...
2
votes
1answer
23 views

IPTWs for Multi-category treatment, how to handle a multi-category mediator

I have a multi-category treatment for which selection is adjusted for using IPTWs. My concern regards a multi-category mediator that occurs post-treatment, but which also co-occurs with the outcome. ...
0
votes
2answers
31 views

Checking if treatment is effective without control group

I am experimenting with few treatments to see which one is effective. I do not have luxury of control group to compare against. In such scenario, is there any method to see if the treatment has been ...
0
votes
0answers
13 views

Analyzing Data for multiple treatment groups

I'm currently designing a research proposal to analyse the effect of varying the amount of cash transfered in a conditional cash transfer program on raising school attendance rates. The cash ...
0
votes
0answers
17 views

Statistical analysis of multiple trials (3 categories) at 3 time periods for 2 group of subjects

I am confused about statistical analysis of an experiment in which there are two groups of subjects i.e. experimental & control. Each group goes through a treatment and multiple readings of ...
2
votes
1answer
62 views

Are healthy patients an appropriate control group?

I am working on a study where patients with a chronic disease received a treatment. The goal is to determine the effect of the treatment on various outcome variables. I have pre and post data (before ...
0
votes
0answers
30 views

Standard Error of a formula

If I do have 100 samples of irrigated plants (labeled from 1 to 100) and 100 samples of non-irrigated plants (during 5 days) (labeled to 101 to 200) from a drought tolerant specie and 100 samples ...
1
vote
1answer
54 views

Understanding the perfect randomization assumption in treatment models

I have a basic question on the relation between counterfactual outcomes and treatment. Notation: Let $D$ denote the treatment, taking value in $\{0,1\}$ where $D=0$ means untreated and $D=1$ means ...
2
votes
1answer
63 views

Statistical Modelling of a complex experimental design

I have the following experimental design, and am quite uncertain which statistical approach would be the best to investigate my data. I have three experimental treatments of my participants and would ...
0
votes
1answer
81 views

Interacting treatment variables with independent variables in matched samples

Can we interact the treatment variables with independent control variables that have been used for matching? I have a binary treatment variable called 'medicine'. It indicates whether a person ...
2
votes
1answer
53 views

How to chose covariates to adjust for in a regression analysis

I am running a regression analysis where my primary interest is to see if the outcome differs by the group (treatment vs. control). However, I have some 80 other clinical and socio-demographic ...
0
votes
1answer
22 views

Test for significance before testing

I got a question regarding the binomial distribution and testing for significance in general. I need to divide a dataset into a treatment group (with phone call) and a control group (no phone call). ...
0
votes
1answer
39 views

Difference-in-Difference to identify treatment effect, with the treatment switched on/off?

In a classic DID model, the policy (or the treatment status) stay, once switched on, the same across the observation periods. That is, you have some units that are all untreated before the observation ...
2
votes
0answers
34 views

Modeling decaying treatment effects

Suppose I want to measure the effect of tornadoes on voter turnout at the county level. I suspect that counties that experience tornadoes will have lower voter turnout in the subsequent election than ...
1
vote
0answers
515 views

Difference in difference model with multiple time periods and treatment/control pairs

I am trying to estimate a difference in difference model with 10 time periods (t=10) and many different plots of land, which are the unit of observation. Each plot of land which becomes treated at ...
0
votes
1answer
82 views

Is a Mixed ANOVA the same as a combination of between ANOVA + repeated ANOVA + between ANOVA?

In my study involving three conditions (control, treatment 1, treatment 2), I am interested in measuring 2 DVs at a pre- and post-exposure. So effectively a 3x2 design (participants randomly allocated)...
1
vote
1answer
239 views

The implications of non-random allocation of intervention

I'm trying to understand the implications of an intervention which is not randomly allocated in a quasi-experimental setting. The intervention is receiving a license for shale gas exploration in the ...
2
votes
0answers
498 views

ANOVA - Do I use raw or aggregate mean data to compare groups

Here is my study design: there are four soil plots - A,B,C,D each plot is sampled for soil moisture at 15 locations this soil moisture sampling is done for 10 rain events I need to compare the soil ...
1
vote
0answers
13 views

Validity of conclusion of statistical tests when comparing two groups of observations in an experiment

I am just reading the results of an experiment, and I am having a hard time estimating their validity. In the experiment, several participant had to perform a certain task twice, once with the ...
2
votes
0answers
31 views

How to analyze the longitudinal effect of blood pressure and its treatment on outcome

Say I have an observational dataset over 20 years with blood-pressure measured each year for 1000 men. Each year a decision is made whether to start antihypertensive drug A, drug B or continue ...
4
votes
1answer
3k views

Difference ATE and ATET?

I have some problems understanding the difference between ATE and ATET and the Selection Bias. To explain what my understanding is I have done the following representation so you can correct me: We ...
4
votes
1answer
4k views

Dynamic treatment timing in a panel-DiD framework

I have a question regarding the timing of treatment effects and how one could use the difference-in-difference estimator on a panel data set. Let me begin by saying that I have a big firm level ...
3
votes
1answer
220 views

How to deal with dropouts from a waiting list control group?

Many treatment studies compare a treatment group with a waiting list control group, for example to adjust for spontaneous remissions. Unfortunately, many more participants drop out from the waiting ...
3
votes
1answer
480 views

Average treatment effect on the treated

There is something conceptual I don't understand with average treatment effect on the treated. Say you have two binary outcomes $Y_i(W_i)$ in which $W_i$ is either 0 or 1 (treatment). So I either ...
1
vote
1answer
20 views

How to calculate the post-hoc treatment effect depending on initial burden of patient

I have longitudinal data following patients before and after a dichotomous treatment. Exploratory analyses strongly suggest that the effect of the treatment depends on the initial burden of the ...