And even if this imbalance is relatively small, we observe that it can, for example, impacts the internal validity of the study. A really interesting paper to dig into, in sum! [4/4] #ieMethods
To develop their reflection, the authors use an OLS regression, and decline it into four different “specifications” or “models”. One key aspect of the latter is the method used to decrease any imbalance between the respondents interviewed at different times. [3/4] #ieMethods
In their comparative politics study, Gerring & al. (2009) look at the practical effects of the presidential & parliamentary systems. They try to answer this major political science research question with the help of a RDD. [1/4] #ieMethods
👉 https://t.co/SBDXKG00Kp
This high number of independent variables combined with the numerous models to understand them led the authors to multiply the robustness tests. However, the mechanisms stay unclear between the two political regimes, their electoral systems types and the DV. [3/4] #ieMethods
@BJPolS @Kunkakom @kongavras The way the authors backed up their « age, period and cohort » (APC) analyzed part through the use of the GAM AND the robust hierarchical APC method (rHAPC), gives interesting indications on the generational effects in the study as well as the latter's robustness. #ieMedthods
@apsrjournal@maxallamong An interesting addition in this experimental design is the introduction of a « washout period » in studies 4/5, in opposition to studies 1/2/3. This attention to demand effects definitively strengthens both the internal and external validities of the study. #ieMedthods
@apsrjournal @prof_mirya A a rare and interesting case of « as if » randomization through individual’s survey. The causality link studied was definitively strengthen by first, the use of the UESD and time-series designs, and second, by the balance and random checks. #ieMedthods
@apsrjournal@laurenyoung231 Nice example of a hybrid experiment in the form of lab-in-the-field. A common limit to the latter lies in the noncompliance of the units. To avoid it, the author worked precisely on the recruitment and randomization processes (which then increase the internal validity) #ieMethods
@apsrjournal@RuneJSorensen A great example of a DiD design. I particularly like the further testing of the ‘education’ control variable: highlighting its effect on the vote turn out and the occupation of the people proves the high internal validity of the design. #ieMethods
@BJPolS@ProfJaneGreen@HellwigT@OfficialUoM A interesting example of survey studies, especially in its test of control variables. For example, the control variable regarding immigration attitudes captures well the impact of the latter on the study dependent variable of Brexit perceptions. #ieMethods
@apsrjournal@Fromagehomme@DrCarynPeiffer Useful topic for nigerian policy makers, with a well-adapted linear regression methodology for Lagos. The inspiration from the vignette survey experiments, in the form of three different « messages », fits also very well to the core of the authors' research question. #iemethods
Indeed, the authors found solid and generalizable results. For example, they introduced a spatial lag regression model to avoid any design artifact impacts on the results, which in return increase the overall external validity of their RDD research. [2/2] #ieMethods
This analysis of social policies spending by developing countries through a RDD methodology, by Wibbels and Ahlquist (2011), is a relevant example of how precise pattern can be highlighted through simple - but rigorous - methodologies. [1/2] #ieMethods
👉 https://t.co/VYIYDsisXQ
However, the research tries to capture its dependent variable with the measure of redistribution, and we can wonder in this way if all policies that redistribute income protect workers from foreign competition? [4/4] #ieMethods
In her comparative analysis, Walter (2016) focuses on the effect of trade on the support for compensatory policy. Innovatively in the trade theory, the author based her analysis on the differences between firms within the same sectors. [1/4] #ieMethods
👉https://t.co/MoFNGooTEJ
For example, the independent variable « Exposure to Globalisation » combines three different measures based on official data and scholars researches, while being designed to avoid any moderating effects, increasing globally the overall internal validity. [3/4] #ieMethods