# Questions tagged [standardized-mean-difference]

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### Issues calculating SMDs after applying IPTW weights

I get the exact same standardized mean differences (SMDs) before and after applying inverse probability of treatment (IPTW) and stabilized IPTW weights to my data. I reproduced this below using the ...
124 views

### z score total for fixed alpha and beta in sample size calculation of mean differences

Can someone explain in detail how $z_\text{total}=z_{\alpha} + z_{1-\beta}$ in a one-tailed hypothesis test of mean difference $\mu_1 - \mu_2$ with common variance in order to determine sample size. ...
• 63
14 views

### Standardizing variables from complex surveys

I have several continuous variables from a survey that I want to analyze. I will use survey weights for regression. But I want to standardize those variables first. Should I use the weighted means ...
1 vote
36 views

### How to backtransform SMD to MD using metafor

I´m performing a prognostic effect meta-analysis of SMD in the metafor R package. Data includes means and SD for each arm (...
1 vote
31 views

### Calculating the mean of different SMRs

I have the SMRs of different local areas. The same reference population was used for the standardization. The local areas were divided into 5 groups (group1, group2,...,group5). I want to know if the ...
• 159
53 views

### Calculating SD for Change in time

I'm conducting a meta-analysis on weight change (T2 - T0) between Group 1 and Group 2. The data I have typically looks like this: Weight (kg) Group 1 (n=15) | Group 2 (n=14) T0 65.31±16.49 | 59.06±...
155 views

### How to transform GEE coefficients to Cohen's d (standardized mean difference) for meta-analysis

I am conducting a meta analysis and am looking into how to convert coefficients (with SEs) from a GEE linear estimation into a standardized mean difference, Cohen's d. Does anyone have any hints on ...
458 views

### Discrepancy between standardized mean difference in cobalt and smd packages

Let's suppose I have weighted my population using WeightIt ...
• 159
291 views

### Formula for standardized mean difference in meta-analysis

I am reading the book: Terri D. Pigott. Advances in Meta-Analysis. Springer 2012. https://link.springer.com/book/10.1007/978-1-4614-2278-5 On page 10, there is a formula for standardized mean ...
• 1,035
1 vote
29 views

### meta-analysis when the control value is taken from a standard (iso, en, etc...) and do has not any variance

I am starting to conduct a meta-analysis on the effect of different raw materials on pellets quality (for bioenergy purposes) I have already the database of studies and my idea initially was to ...
1 vote
88 views

### How to calculate standard deviation for the difference between two means?

I am writing a paper where I am comparing the change over time of an intervention and control group. I have the mean and standard deviation for both groups at baseline and the mean and standard ...
146 views

### Mean difference (95% CI) between paired samples

I have some results from a study pre- and post-intervention. It's for an underpowered feasibility study, hence I am not performing formal hypothesis testing but I'd like to calculate mean difference (...
• 23
119 views

### Evaluating success of propensity score matching with single metric that accounts for both covariate balance and matching rate?

Propensity score matching techniques can be assessed and compared with covariate balance metrics like the standardized mean difference (SMD). However, SMDs don't account for varying matching rates. ...
• 6,194
1 vote
37 views

### Is it possible to summarise standardized mean differences deriving from different variables in a meta-analysis?

I am conducting a meta-analysis on the alteration of fine roots in forest soil as a consequence of soil compaction after logging operations. I have already the database which is made up of studies ...
131 views

### Is it appropriate to use standardized mean differences (SMDs), and if so, how do you combine them?

I'm conducting a meta-analysis and trying to figure out the best way to determine the effectiveness of a particular treatment using results from multiple studies. As the studies vary in several ...
• 11
31 views

### Is there an acceptable range for the values of MDs and SMDs? If MDs go below and beyond -1 and 1, respectively, are my results still valid?

I'm not certain whether my subgroup meta-analyses that produced extreme(?) values of MD (highest is 13.86 [95%-CI, 12.44; 15.29] and lowest at -15.42 [95%-CI, -20.63; -10.20]) are still valid. I used ...
447 views

### What's the meaning of an increased SMD after inverse propensity weight matching?

I made an inverse propensity weight matching for my research project (two groups, treated and control) and after I observed for some covariates an increased standardized mean difference. What is its ...
• 21
2k views

### What is the meaning of a negative Standardized mean difference (SMD)?

The core of my question is: What is the meaning of a negative SMD? To assess the balance after Propensity Score Matching (PSM) with the R package MatchIt the ...
• 282
426 views

### Converting effect size from linear and logistic regression

I want to calculate a same effect size from a linear regression and a logistic regression to be able to compare them. More specifically, I would like to calculate standardized mean-difference (SMD). I ...
128 views

### Balance diagnostics: Why not measure post-matching balance **within** matched treatment-control pairs?

I understand there are a number of techniques for evaluating post-matching balance at the covariate level: standardized mean difference (SMD), variance ratios, and empirical CDF statistics. Are there ...
• 6,194
1 vote