Error in if (xhat == 0) out <- 1 else { : missing value where TRUE/FALSE needed about mediation HOT 10 OPEN

this may help you to fix this problem.
in mediate.R, you can find "For binary response models, the 'mediator' must be a numeric variable with values 0 or 1 as opposed to a factor." (Line 53-54)

from mediation.

I was facing the same problem using a continuous exposure and a binary mediator.
Here's what I did:

1. df$mediator <- as.factor(df$mediator)

2. df$mediator <- as.numeric(df$mediator)
   The binary mediator records were so "converted" from 0 and 1 to 1 and 2, respectively.

3. df$mediator <- ifelse(df$mediator == 1, 0, ifelse(df$mediator == 2, 1, df$mediator))

df$mediator <- ifelse(df$mediator == 1, 0, ifelse(df$mediator == 2, 1, df$mediator))

Finally, i run the mediate function once more and that worked with no more issues.

from mediation.

I can't replicate this without the data but #24 is likely to fix this problem

from mediation.

I'm having trouble with mediation::mediate()

nb.terror.y.anx <- glm(data = terror_removed2,
                   certain~cond + event + WC + anx,
                   control = glm.control(maxit = 50000),
                   family = "poisson")

nb.terror.m.anx <- glm(data = terror_removed2,
                   anx~cond + event + WC + certain,
                   control = glm.control(maxit = 50000),
                   family = "poisson")

med.anx <- mediation::mediate(nb.terror.m.anx,nb.terror.y.anx, treat = "cond", 
                              mediator = "anx", sim = 2)

Works fine, but whenever sim>2, I get:

Error in if (xhat == 0) out <- 1 else { : 
  missing value where TRUE/FALSE needed

I saw there's still an open topic in a realted issue

Hope it's ok to flag it up again.

Thanks!

@almogsi Hello! I met the same problem. Can I ask how did you solve this problem eventually? Many thanks!

from mediation.

I am also running into the issue and getting this error. The response in #24 has not helped. I have a continuous mediator, binary (0/1) exposure and survival outcome. Could someone please advise?

Error in if (xhat == 0) out <- 1 else { :
missing value where TRUE/FALSE needed

from mediation.

I am also running into the issue and getting this error. The response in #24 has not helped. I have a continuous mediator, binary (0/1) exposure and survival outcome. Could someone please advise?

Error in if (xhat == 0) out <- 1 else { : missing value where TRUE/FALSE needed

Hi, I'm wondering if you have found a solution to this issue?

from mediation.

@b-staley I have the same issue, did you figure it out? : )

from mediation.

@Sabrinaeder1424 and @Effy-runrun, I have not found a solution yet. Please let me know if you do.

Best,

Brooke

from mediation.

@Sabrinaeder1424 and @Effy-runrun, I have not found a solution yet. Please let me know if you do.

Best,

Brooke

Hi, I have given up trying with this package, and found another package call "regmedint" while searching. It was developed based on SAS and SPSS macro "mediation" by Valeri & VanderWeele, which also allows for mediation analysis concerning survival data. I succeeded in analyzing my data with this package, and the authors have written a detailed paper on how to use this package.
https://www.researchgate.net/publication/359526597_A_Brief_Primer_on_Conducting_Regression-Based_Causal_Mediation_Analysis

Hope this will work for you too.

from mediation.

Thanks for @alessiohappy inspiration.
I also found a similar solution.
To rum mediate function, we have to keep the specific class of variables.

1. Outcome variables and mediators should be continuous variables with values "0" and "1", despite glm can fit the model with character outcomes, but it seems that mediate can not.
2. Exposure variables should be binary or continuous.

I don't know why we have to set the class of the variables, but it indeed works.

from mediation.