<p>This seems promising. I haven't used it</p>

<p>Heathcote, A. (2004). Fitting Wald and ex-Wald distributions to response time data: An example using functions for the S-PLUS package. Behavior Research Methods, Instruments, &amp; Computers, 36(4), 678-694.
<a href="http://www.tascl.org/uploads/4/9/3/3/49339445/26_.pdf" rel="nofollow noreferrer">http://www.tascl.org/uploads/4/9/3/3/49339445/26_.pdf</a></p>

<p>It does include s-plus code in a supplement to the journal article:
<a href="https://link.springer.com/article/10.3758%2FBF03206550" rel="nofollow noreferrer">https://link.springer.com/article/10.3758%2FBF03206550</a></p>

<p>Often S-plus can be used in R, sometimes with some adjustments.</p>

CC BY-SA 4.0
2018-05-21T06:42:37.203Z
2018-05-21T06:42:37.203Z
Jeromy Anglim
<p>I'm working on reaction time data. I want to fit the data with an ex-wald model but I only found one paper which interpreted the fitting with S. But I don't know S. Are there any ways to fit the RT data with R, python or Matlab?</p>

CC BY-SA 4.0
2018-05-19T15:04:05.050Z
You might get better answers in stuck overflow. someone would certainly migrate the question to there.
Erdem
<reaction-time>
How to fit an ex-wald distribution model with R?
Yujian
# How to fit an ex-wald distribution model with R?

(Asked by: username_0 on 2018-05-17)

I'm working on reaction time data. I want to fit the data with an ex-wald model but I only found one paper which interpreted the fitting with S. But I don't know S. Are there any ways to fit the RT data with R, python or Matlab?

**Tags:** reaction-time

> **Comments:**
> **username_1**: You might get better answers in stuck overflow. someone would certainly migrate the question to there.  

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## 1 answers

### Answer by username_2 on 2018-05-21. Score: 2 | Accepted answer

This seems promising. I haven't used it

Heathcote, A. (2004). Fitting Wald and ex-Wald distributions to response time data: An example using functions for the S-PLUS package. Behavior Research Methods, Instruments, & Computers, 36(4), 678-694.
<http://www.tascl.org/uploads/4/9/3/3/49339445/26_.pdf>

It does include s-plus code in a supplement to the journal article:
<https://link.springer.com/article/10.3758%2FBF03206550>

Often S-plus can be used in R, sometimes with some adjustments.


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