All Questions
Tagged with r time-series
6,254
questions
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19
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Getting "invalid 'type' (character) of argument" error with numeric values when I do apply.weekly(data$x, sum)
I have a time series object and I am creating a list of the variables at different timesteps.
when I do apply.weekly( , mean) it works fine, but when I want to sum the values over a week it gives me..
...
- 1
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41
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Problem with dynamic linear model -> lagged variable explains 100% of my model [closed]
I created a regression model, which regresses a cycle component onto a lagged cycle component and various other variables.
It looks like this:
regoffice4 <- dynlm(
diff(diff(officecycle,1),1) ~ ...
2
votes
2
answers
50
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Ploting weekly data with base::plot with unique and evenly spaced labels
I am trying to create a simple scatter plot, so weeks on the x-axis and "cases" on the y with each indicated by a dot and note I can only use base R's plot(), no ggplot.
I have data with 156 ...
- 57
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35
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R – Model specification for TWO TIME variables AND PAIRED design in repeated measures generalised linear mixed model (GLMM) (in lme4 package)? [closed]
I’ve split the question into 5 parts. The whole/specific issue is on 5). 1-4) is double checking the underlying theory.
My understanding from sources like
Crawley, M.J., 2013. The R book 2nd Edn. ...
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votes
1
answer
13
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Forecast::ets throwing 'lastseason' error with weekly time series length > 52 ... bug?
I think I stumbled upon a bug?
I have a generic forecasting process that runs ets on many different time series. Yes, I know that forecast::ets is not intended to work on data with frequency greater ...
- 82
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votes
1
answer
28
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Dynamically perform calculation down column in R
I have data that looks like this:
library(tidyverse)
df<-tibble(date = as.Date("2024-07-01"), starting_n = 100, growth_rate = 0.05)%>%
bind_rows(
tibble(date = seq.Date(as.Date("...
- 1,349
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1
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34
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How to inversely transform time series predictions to add seasonality back in? [closed]
I have transformed some data to make it stationary before fitting an ARIMA(1,0,1) model.
I specifically want to manually transform the data to better understand the process.
I can successfully fit a ...
- 35
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19
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Is it possible to perform Rolling Origins on multiple time series with the modeltime package in R?
I am currently working on a project that involves multiple time series, and I would like to know if it is possible to implement a Rolling Origins technique for these multiple series using the ...
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votes
1
answer
20
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How can I fit a `HoltWinters` model with the `fable` package?
I have a tsibble with data every 15 minutes.
I want to simulate:
ts_data <- ts(data$value, deltat = 1/96) # There is a daily seasonality
model <- HoltWinters(ts_data)
predictions <- predict(...
- 258
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12
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GLM for longitudinal or time-series -- how to model and interpret a binary logistic regression over time controlling for covariates using R [migrated]
I work with the risk of delays (0 = no risk, 1 = risk). I want to run a binary logistic regression considering panel data over time. I have data from 4 years (4 time-points) and some covariates (...
- 1,554
2
votes
5
answers
65
views
How to access row and column names (year and month) from a (monthly) time series, when rownames and colnames fail?
In monthly time series (frequency = 12), R prints out the years and months automatically, arranging them to look like row names and column names. But they are not accessible through rownames or ...
- 82
0
votes
1
answer
33
views
Delete a single value in dataframe based on particular date and time
I have a dataframe and I want to delete a single value based on the date and time, I want to delete the value for Variable 2 on the 2020-06-15 14:00:00 with an option to replace the value 780.45 with ...
- 55
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48
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Specifying an advanced GARCH model in R
I am trying to implement a specific kind of GARCH model in R.
The simple description of the model is the following:
I am trying to build an GARCH(1,1) model, where I_t is a dummy variable indicating ...
- 1
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0
answers
12
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Custom function to create sequential index variable in longitudinal data [duplicate]
This is probably very basic but I'm having a hard time finding an answer to my question in existing posts. I'm working with longitudinal data and need to create a sequential index variable that ...
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1
vote
1
answer
44
views
ggplot time series geom_line showing as a bar chart
I am trying to create a time series line chart with ggplot2 using the following code:
ggplot(my_data, aes(Period_end_date, Value, group = `Policy Year`, colour = `Policy Year`)) +
geom_line() +
...
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