John Rahilly

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Questions related from John Rahilly

Interrupted Time Series Analysis with multiple coincidental interventions?

Hi, As part of our research we're conducted Controlled Interrupted Time Series Analysis on 35 individual case studies. In 33 instances the intervention occurs in isolation and can be analysed...

28 April 2022 6,495 1 View

Algebra for Intervention Effect in Interrupted Time Series (with delayed effect)?

I have run an interrupted time series analysis using GLS regression model in R. My data consists of 48 observations [time 1:48], with the intervention implemented at time 20, but it's effect not...

26 June 2020 7,343 0 View

Does a generalized least squares model require normal distribution?

I've got myself into a bit of a mess with some analysis. I have conducted an Interrupted Time Series analysis using GLS, but wanted to check whether or not such assumed a normal distribution? The...

19 June 2020 4,201 1 View

Use of Transfer Function within DLM as means of quantifying intervention effect?

Hi, Has anyone applied a transfer function as a means of quantifying an intervention effect in an Interrupted Time Series analysis? I have a time series consisting of 48 quarterly observations...

18 May 2020 1,190 0 View

Generating a confidence interval for forecast using DLM package in R?

HI, I've fit a DLM to some data using the dlmFilter in R [from the dlm package]. From said filter I have predicted 7 steps ahead using the dlmForecast function. The predicted outcome is very...

14 May 2020 9,204 0 View

Use of ARIMA model in Interrupted Time Series Analysis?

Hi, Not sure whether anyone can help, but I've encountered some problems with my Interrupted Time Series Analysis. I originally applied a Dynamic Linear Model to the data, from which I hoped to...

05 May 2020 5,303 6 View

Interrupted Time Series with lag?

Hi, Wondered if anyone could help. I've created an Interrupted Time Series analysis approach to interpret the effect that can be associated with the implementation of a revised planning policy...

28 April 2020 6,651 0 View

Getting stuck with DLM package in R?

Hi, I'm analysing time series data using a few different methods, including Dynamic Linear Models. For such I am using the dlm package in R. However, I don't feel like I really understand it and...

04 March 2020 1,188 3 View

Free methods for analysing landcover change?

Hi, As a supplemental aspect of my current research into land cover change within the UK I am trying to use Landsat 5 data in order to assess the validity of differing approaches. I have...

27 September 2019 5,021 3 View