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Questions tagged [holtwinters]

Holt-winters smoothing is one of the simplest form of exponential smoothing

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Looping through rows from a spreadsheet, running a function through each row and outputting the result back to the end of the same row

This is a tough one, but I've been stuck for 2 weeks and I would appreciate if someone could help me on this. Basically, I've got a spreadsheet where the first row is like this (I was not able to paste the spreadsheet here and keep it formatted in…
W Barreto
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Time series forecasting in r : ts() function in forecast package

I am currently working on a sample data that requires me to perform time series forecasting in R on a given set of data.So i need to forecast for daily basis. I am getting the following error message. Error in -.default(x, trend) :…
Eswaraiah
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HoltWinters Nested Seasons in R

I have a dataset of daily demand over the last 2 years. The data has weekly seasons and nested daily seasons. I converted the data into a time series using ts function with frequency=365. When using HoltWinters method now, he interprets every day as…
PeterD
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Why am I getting flat time series forecasts from most of the techniques?

I have a simple example time series: Data: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2000 200.1 199.5 199.4 198.9 199.0 200.2 198.6 200.0 200.3 201.2 201.6 201.5 2001 201.5 203.5 204.9 207.1 210.5 210.5 209.8 208.8…
William Calhoun
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Forecasting Daily Data using HoltWinters

First of all I have already consulted this article and this but couldn't get it to work. I have daily data starting from 28-03-2015 till 27-02-2017. My TS object looks like this: bvg11_prod_ts <- ts(bvg11_data$MA_PROD, freq=365, start=c(2015, 87),…
Shery
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Holt Winters Forecast with Multiple Input Variables

For context, I'm a novice R user, so please forgive any incorrect terminology/processes. I am actively trying to improve my coding ability, but recently have become stumped. I have the following data set where A * B * C = Output: Date          …
user6301467
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Date on the x-axis in Holt-Winters graph R

I am trying to plot the date as the x-axis in a Holt-Winters graph in R. I have searched for this topic on this site and many others with no luck. I am aware of using xaxt="n" and then axis() for most plots. The following code works for a normal…
gleasocd
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HoltWinters forecast in R

I have a time series divided in 30 days and hour , so 720 values (24h*30). Every Saturday and Sunday as you can see I have the lowest values at the time series . (It starts from friday). I divided the time series in 3 week for "train" and 1 for…
DanieleO
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Interpretation of level, trend and seasonal indices in holt winters exponential smoothing

I am trying to learn Holt Winters exponential smoothing. In the algorithm there are three indices involved (level, trend, seasonality) while forecasting. My questions: What is the interpretation of these 3 indices? How do I differentiate between…
user3664020
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Time Series Analysis and R Holt Winters

I have a seasonal (7 days interval) time series, daily data for 30 days. What is the best approach for a reasonable forecast? The time series contains orders made with a app, it shows a seasonality of 1 week (lower sales at the beginning of the…
chopin_is_the_best
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R: Running forecast function through multiple columns of a data frame

I read in a csv file into a data frame using: dataxlsx <- read.csv(file.choose(), header = T) The data frame looks like: Year Month Period X410 X430 X431 2005 1 1 3467748 4434879 1345638 2005 2 2 3626338 4311150 …
Michael Donofrio
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NaNs produced when applying HoltWinters to a matrix

I am trying to an exponential smoothing model using the forecast library. > library(forecast) > dput(dat) structure(list(a = c(142.8163942, 143.5711365, 145.3485827, 142.0577145, 139.4326176, 140.1236581, 138.6560282, 136.405036, 133.9337229,…
Carol.Kar
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holt winters in R by grouping a set of observations (like HW per region/per product)

I am trying to do a holt winters forecast for a dataset which is of this pattern: >Insample Region Week Sales x 01/1/2013 200 x 08/1/2013 250 x 15/1/2013 185 x 22/1/2013 375 y 01/1/2013 155 y …
Shraddha
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ggplot & Confidence Intervals for Holt-Winters Prediction Function

Using data UKDriverDeaths Attempting to use Holt-Winters prediction function & ggplot(). Basically reproduce the data in ggplot (1) with confidence intervals (2). This is the data: data('UKDriverDeaths') past <- window(UKDriverDeaths, end =…
user3608523
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How to save a Holt model forecast in a dataframe in pandas

I have sample data in following format enter image description hereand I am trying to run Holts model on it to forecast ln_value for future 10 time points for each groupby variable 'bid'. I am running following snippet but I am unable to store the…
Shash
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