Questions tagged [causalimpact]
CausalImpact R package for estimate the effect of an intervention on a time series.
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16 views
Endogenous subgroups in impact estimation
I am using RCT data to estimate the impact of a program. After doing the straightforward analysis, I decided to estimate the program impact by subgroups (treatment status*subgroup). The subgroups were ...
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1answer
40 views
Using CausalImpact in R, observed data affected by event that could not affect priors
I am just starting out using the Causal Impact package in R. I am looking at observed data where I know there will be periods of extra traffic due to outside forces. However I cant find any unbiased ...
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63 views
How to calculate causal effects with repeated exogenous shocks over a time series
A rather frequent problem in causal inference is that we come across various shocks over time and try to measure their impact.
In the case of a single shock we can use bayesian methods to predict how ...
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38 views
Impact of propensity model
I have built a propensity model, which gives out probabilities of a customer paying given a collection intervention using a xgboost model. The model has an AOC-ROC of 81% with an accuracy of 77% ...
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55 views
Default CausalImpact Package
I am trying to gain an understanding of the CausalImpact package and the BSTS approach. Consider the following model:
$y_t = \mu_t + z_t + \epsilon_t$, where $\epsilon_t \sim N(0,s^2)$, and
$\mu_{t+...
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1answer
75 views
How is the posterior tail-area probability calculated?
I am currently using the CausalImpact package for some research and in this context I need to know and be able to explain, how the posterior tail-area probability is calculated in order to reproduce ...
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30 views
inclusion of static variables as covariates [closed]
Is there a clear way to include static variables e.g. elevation as covariates in the CausalImpact pacakge. Any guidance would be greatly appreciated.
Anand
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1answer
60 views
Incorporating Fixed Effects with Causal Impact
I have observations on a dependent variable of interest, $Y_{ijt}$, where $t \in [1,2,...T]$ denotes the time, $i$ denotes a particular brand and $j$ a specific product item. At $t=k$, there was an ...
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1answer
134 views
Synthetic control and unobserved confounders
The synthetic control (cohort) method is a very promising approach to causal inference that has been used in a number of interesting studies. It's particularly useful in situations where data are only ...
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1answer
51 views
Pre.intervention and post.intervention should be contiguous in CausalImpact?
I am running a CausalImpact analysis on a time series and my pre.period goes from 01.01.15 to 30.03.15. I want my post period to be from 15.04.15 to 17.04.15.
Is it ok if I create a time series that ...
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0answers
26 views
Assesing impact for rolling enrollment data
I'm running an experiment where some of the users are shown a new widget when they become eligible (some conditions that are unrelated to the experiment itself). I have a control counterfactual group ...
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1answer
65 views
Is it possible to predict the pre-intervention period rather than the post-period using Google's CausalImpact function?
I want to use to Google's causal impact function to impute the effect of an intervetion. However, my data is structured as: pre-period=1991-1995, intervetion occurs, post-period=1996-2017. To clarify, ...
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2answers
210 views
How to choose Control groups for Causal Impact algorithm?
I'm running an experiment and want to use the Causal Impact function to assess how well it performs.
I have 10 different cities. I'm looking to find out what is the best method for choosing which ...
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1answer
82 views
How to use a custom model in CausalImpact where preperiod.start is not right after preperiod.end?
I want to train on a period that isn't immediately preceding the prediction period. You can do this using the default causal model but I'm not sure how with a custom model.
Straight from the ...
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2answers
167 views
Interpreting Mediation Output when ACME is stat. sig but ADE and Total are not
The mediation package in R returns results in which:
The Average Causal Mediated Effect (ACME) (the effect of the mediator alone) is positive and statistically significant
Average Direct Effect (ADE) ...
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0answers
307 views
Pro and cons between Bayesian structural time series (BSTS) vs difference-in-differences?
Google's paper markets BSTS's benefits over DID such that
"In contrast to classical difference-in-differences schemes,
state-space models make it possible to (i) infer the temporal
evolution of ...
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1answer
109 views
Explaining the results of the CausalImpact package where effect is not statistically significant
I've been using the CausalImpact package to compare patent renewal rates across different classes of patents (to determine whether subject matter decisions have particular impacts on the rise or fall ...
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2answers
666 views
How to study the causal impact on multiple time series of interest against multiple baselines
My data consist of time series of Wikipedia hits for football players. I want to use the CausalImpact package to explore the effect of the World Cup on their ...
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0answers
157 views
Causal Impact: Continuous Pre-Intervention to Post-Intervention Time Periods?
Within the context of using R package CausalImpact (Brodersen et. al, 2015), is it valid to use time Periods that are noncontinuous for the Pre-Intervention and Post Intervention time periods?
For ...
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2answers
121 views
CausalImpact: Valid for Single Market [closed]
Is it possible to use the R package CausalImpact (Brodersen et. al, 2015) to estimate the incremental lift of running a local TV ad campaign in Iowa City,IA? We are also running national TV ads across ...
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146 views
Generalizing “Causal Impact” synthetic controls, to multiple outcomes
Does anybody know a way to generalize the use of the Causal Impact google R package to multiple outcome time series?
Say I ran a time series experiment and was able to set up multiple test outcome ...
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1answer
300 views
Scaling control time series with CausalImpact
I'm doing Causal Impact analytics with this python package. Since my control time series have a much larger scale (100-10000 times larger) than my modeled variable, at some point I tried to scale the ...
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1answer
290 views
Reduce credible intervals in Causal Impact model
I'm hitting an issue with a causal impact model that I'm building.
I'm trying to create a counter factual for daily sales at one store (nseasons = 7). I've included sales for 5 other stores nearby. ...
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1answer
86 views
How can you quantify the effect of a campaign in CausalImpact?
I have been working with the CausalImpact R-package to check whether new campaigns or features had a significant impact on a time-series.
I would like to know if it is possible to quantify this ...
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1answer
169 views
How to reason about causal effect in time series when the treatment group reacts even before treatment?
Context:
I'm running into a strange phenomenon about treatment effect and causality that I'll try to recreate here. Let's say I'm doing an observational study: Do people spend more time online as a ...
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1answer
477 views
Difference between using propensity score matching and CausalImpact for causal inference?
I'm investigating causal effect in some financial data, and I'm using two different approaches: propensity score matching with stratification and the CausalImpact package for Bayesian structural time ...
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1answer
131 views
BSTS employing purposedly spurious regressors for causal impact analysis
I'm employing Google Correlate time series to evaluate the causal impact of an intervention on a variable of interest y. I made sure that the Google series are highly correlated with y during the pre-...
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1answer
357 views
CausalImpact with Custom BSTS Model
I'm wanting to use a custom bsts model within the CausalImpact package, and I understand that I need to use a control group in my data; however, I don't really understand where that control group fits ...
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0answers
114 views
(CausalImpact) How to incorporate prior trend into counterfactual? [closed]
I'm working with the CausalImpact package for predicting a counterfactual time series. From prior analysis, I know that the true counterfactual series ought to show a downward trend, but the package ...
3
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0answers
355 views
Specifying seasonality component in Causal impact
How do I supply yearly(month/week of the year) + day of the week seasonality in causal impact? I have 1 year of data in the pre period at daily granularity i.e. 365 data points.
would, nseasons =52 ...
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1answer
197 views
Synthetic Control and Causal Analysis
I am creating a synthetic control variable in which I want to use in order to perform a causal impact analysis of our marketing campaign.
The goal is to find a set of predictor time series that are ...
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2answers
209 views
Meta-Analysis on Effect Sizes with 95% Bayesian CI from CausalImpact R package
I am using the CausalImpact package in R to calculate the impact of a marketing intervention using Bayesian Structural Time Series. This methodology and package is explained in Broderson et al. 2015 ...
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0answers
342 views
Remove price and promotion effects from sales time series
I'm trying to measure the effect of an in-store media campaign on the sales. I have sales data along the time for test (treated) stores and control (not treated) stores.
Before comparing test and ...
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0answers
283 views
Bayesian structural time series with few data points (using CausalImpact)
I am experimenting with the CausalImpact package https://google.github.io/CausalImpact/CausalImpact.html (Brodersen et al. 2015) which uses Bayesian structural time-...
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1answer
455 views
Q: R - CausalImpact | order of control time series [closed]
My colleagues and I have been using Google's R-package CausalImpact for a while but recently discovered something that we can't quite explain. Depending on the order of including the different control ...
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1answer
276 views
Causality Analysis and test of Independence
First the problem: I am refering to lecture note, on page 480, 2nd paragraph, it mentions
If
X is in fact useless for predicting Y given Z, then an adaptive bandwidth selection
procedure (like ...
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113 views
Can I use a list (or similar) of multiple date ranges for pre and post periods?
In the documentation (https://google.github.io/CausalImpact/CausalImpact.html) for CasualImpact there is an example of setting pre and post periods of the treatment:
...
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1answer
829 views
Bayesian Structural Time Series in BSTS package: implementing mixed model
I have been using BSTS package for quite a while and I have found it pretty effective with respect to ARIMAX models.
I was wondering whether it would be possible to share regression coefficients in ...
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1answer
334 views
CausalImpact: model in the paper and default in the package
I was utilising CausalImpact for a study. Only recently did I realise that the model described in the associated paper was different to the default model implemented in the package.
The paper was ...
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1answer
712 views
What does Posterior tail-area probability mean in Causal Impact?
I'm new to CausalImpact package in R. I'm trying to understand what the p-value or Posterior tail-area probability mean in the summary. Does it mean that because the p-value is very low, the chance ...
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0answers
146 views
Chow Test and Structural Breaks
I am an economics student and we are tasked to make a mini thesis. I was thinking in getting smoking demand determinants and the effect of sin tax (excise tax on tobacco here in the Philippines and ...
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1answer
55 views
Comparing store sales based on time period
I am trying to refine the way my company validates tests in retail stores for products that we sell. The prior way was only to look at immediate change in dollar and unit sales without taking into ...
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1answer
123 views
Estimation of treatment effect when there is an unknown and variable coverage of the population
I am not sure if I am using the correct terminology, something must be written about the following problem, but I cannot find it by searching.
I am presently analyzing data about the effect of ...
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1answer
139 views
Evaluating the Impact of National Policies Using Panel Data
I have a panel data set covering various countries over various years. I have information about the years in which these countries published an entrepreneurship policy - some countries only published ...
7
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1answer
690 views
Using Google Causal Impact package to assess the significance of a planned intervention
I am using the Causal Impact package in R to infer the causal effect of an intervention in some data which are highly correlated and seasonal.
Specifically, i got 17 days of hourly data, intervetion ...
3
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2answers
516 views
Odd behaviour in CausalImpact (R)
I'm finding some odd behaviour in Google's CausalImpact R package and wondered if anyone has found the same and knows the cause. If you feed the package a certain length time series, the model snaps ...
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1answer
303 views
The Causal Impact Package in R could not trace the right number in the test group
I have this sample dataset which is as follow:
head(data)
...
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0answers
293 views
Causal Impact and using multiple control series with their regressors
Hi all I am analyzing several DMA's for campaign effectiveness using the CausalImpact package by Kay Brodersen. I have data for participants and non-participants INCLUDING their contemporaneous ...
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0answers
94 views
Counterfactual analysis in the absence of an exogenous intervention
I am interested in exploring the causal effect of poverty on the adoption of a number of climate-resilient agriculture practices in sub-Saharan Africa.
In exploring the causal effect of poverty (a ...
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1answer
275 views
How does CausalImpact Prevent Overfitting
I'm using Google Research's Causal Impact package, and I'd like to understand more fully how the package prevents overfitting and selecting a bad batch of the covariates by chance.
Here's the ...
