EUROCRIM 2018 presentations

I am still very new to blogging – a couple of people have recently suggested that I should publish my conference presentations on my website, which is so obvious but has never occurred to me earlier. I had the privilege to give two presentations last weekend at EUROCRIM in Sarajevo.

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Causal mediation analysis with multiple mediators 3. – Sequentially ordered mediators

In this third, and final post on causal mediation analysis with multiple mediators (see the first two here and here), I discuss the case of sequentially ordered mediators.  Continue reading “Causal mediation analysis with multiple mediators 3. – Sequentially ordered mediators”

Causal mediation analysis with multiple mediators 2. – Post-treatment confounding

This is the second installment in a series of posts on causal mediation analysis with multiple mediators (see the first one here), which discusses how to handle the case of post-treatment confounding. Continue reading “Causal mediation analysis with multiple mediators 2. – Post-treatment confounding”

Causal mediation analysis with multiple mediators 1. – Causal independence and joint mediation

To kick off the year with an “easy” and “light” topic, I decided to start a series of discussions on causal mediation analysis with multiple mediators. Because the remaining papers in my PhD rely on such techniques, I thought it might make sense to write a brief summary of the different approaches one can take. I am aware that in a rapidly advancing field such as causal inference this post risks becoming obsolete very quickly, at the same time, I hope that this overview can still remain relevant for some upcoming papers (and posts).  Continue reading “Causal mediation analysis with multiple mediators 1. – Causal independence and joint mediation”

ScotCET and sensitivity analysis for causal mediation analysis with a single mediator

This post should be considered as an addendum to this previous one that discussed causal mediation analysis with a single mediator. That post ended with the argument that causal evidence could be found that procedural justice indeed mediated the effect of the treatment (previous experiences with the police) towards the outcome (normative alignment with the police). This post will discuss two sensitivity analysis techniques which assess this finding’s robustness to unmeasured confounding. Continue reading “ScotCET and sensitivity analysis for causal mediation analysis with a single mediator”

ScotCET and causal mediation analysis with a single mediator 3. – A demonstration in R

This post finishes the discussion of two other ones (this and this) by providing an example how to carry out causal mediation analysis with a single mediator in R. The “mediation” package is utilised, for a full description of the package’s capabilities, you can refer to Tingley et al. (2014). For STATA users out there, there is a “paramed” package in STATA which should also produce the same results (within rounding error). A note of caution though: the “paramed” package can only be used with linear mediators and outcomes, and with binary logit models with rare outcomes (see: VanderWeele 2016). The dataset for the analysis can be downloaded from the bottom of the page. Continue reading “ScotCET and causal mediation analysis with a single mediator 3. – A demonstration in R”

ScotCET and causal mediation analysis with a single mediator 1. – Procedural justice and normative alignment with the police

This post continues the discussion of the Scottish Community Engagement Trial (ScotCET). In four posts (you can find them here, here, here, and here) I discussed the apparent failure of implementation over the summer. I concluded that despite the unexpected direction of the findings (i.e., those who received the procedurally just treatment had more negative opinion of the police), the treatment effect appeared to be consistent, was not heterogeneous, and thus it could be actually attributed to the research design. Continue reading “ScotCET and causal mediation analysis with a single mediator 1. – Procedural justice and normative alignment with the police”

Scotcet and implementation failure 4. – Treatment effect and design heterogeneity with a demonstration in R

This final post finishes the discussion of the previous three (you can find them here, here, and here) by looking at treatment effect heterogeneity and design heterogeneity.
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ScotCET and implementation failure 1. – An apparent implementation failure

As outlined in my earlier post, one of the key propositions in the procedural justice literature is that – at least in most Western countries – procedural justice has an outsized importance in shaping views regarding the police. Yet, there have been only a few studies that established a causal relationship between police practices and the perception of procedural justice (e.g., Lowrey et al., 2016; Sahin et al., 2016), and none, that has explored its mediating role (although see Mazerolle et al. (2013) who used a path analysis approach – more on this in another post). Thus, in my first paper, I decided to “pry open” the black box of causality, and investigate procedural justice’s causally mediating role. Continue reading “ScotCET and implementation failure 1. – An apparent implementation failure”

The research agenda of my PhD in a nutshell

The papers in my PhD have been inspired by the theory of procedural justice policing. There is a lively debate on how this theory should be formulated which should be discussed in its own post sometime in the future. For now, let’s state that by-and-large my perspective is aligned with how Tom Tyler and Jonathan Jackson have been postulating the theory (e.g. Jackson and Gau 2015; Tyler and Jackson 2013, 2014). Continue reading “The research agenda of my PhD in a nutshell”