Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [pre-post-comparison]

Comparisons before and after an event or experimental intervention. Includes BACI (before-after-control-impact) studies.

249 questions
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Can i get any statistics of users visiting page increase due to adding a notification

Can I get any statistics or plots on numbers of users visiting a website before and after adding a pop-up or notification on their website which regularly asks users for filling some details in profile etc. just like on LinkedIn. Edit: I just want…
Tom Riddle
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What's the best measure of how much a value changes?

From a car, I get a value every second for accelerator pedal, from 0 to 100%. When you don't touch it, it reports 0%, and when you kick it to the max, that is 100%. I want to calculate how much change there is in this value. It will be one of many …
Terje Kolderup
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vote
1 answer

Interpretation of intercept when adjusting for baseline response

I am working on a data set with two time points and I am interested in the change from baseline. There are no differing treatment groups. First, I realize that this is most simply made using a paired t-test. However, I would like to adjust for…
E_J
  • 303
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Relative change of two vectors from a pretreatment value

I have to vectors $\mathbf{y1_{post}}$ and $\mathbf{y2_{post}}$ (post because they were measured after a…
jealcalat
  • 35
1
vote
1 answer

Comparing pre and post test raw scores with one subject

I am currently in the process of trying to analyze data from research carried out. I am analyzing whether a music intervention showed improvements in rate, accuracy, fluency, and comprehension on a single subject. I have used the Gray Oral Reading…
user95151
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vote
1 answer

Compare sort results by custom score

I have one numeric score S1 to (ascending) sort a dataset. Now I have developed another method that returns a numeric score S2 that should sort the dataset in similar way. My question: with what methods can I evaluate the sorted results to compare…
El Dude
  • 211
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Marginal Homogeneity results zeroes on the off diagonal (in R)

I am performing an analysis and am using marginal homogeneity/stuart maxwell for the first time. It is a pre-post test and in analyzing secondary outcomes I ran into an issue. I downloaded three different marginal homogeneity packages in R…
Jonathan
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0
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1 answer

Pretest-Posttest Statistical Test - No Control Group

I am writing a research proposal measuring the effects of a treatment on a population with a pretest and posttest as the dependent variable. What is the best statistical analysis to use for this data?
Hannah Ballard
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Describing a fold change

I have been told I cannot have a fold change of less than 1. Is this correct? I want to describe the fold change for the following: 62 (original value) to 64 (final value). I have calculated 62/64 = 0.97. Should this in fact be 1.03?
N_D81
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