Question
1 Exercise I - API
• Download data about NASA from Twitter.
• Clean the data

2 Exercise II - Text Mining
• Use data from Exercise I. Plot cloud word
Use topic modeling to model each document (description field) as a mixture of topics and each topic as a mixture of words.
Do K-means cluster analysis. Find out best K before using k-means cluster analysis, please give explanation how you choose K.

3 Exercise III - Time Series Analysis
• Download GOOG stock price through R API over past 10 years
Use the ses function from the forecast package to get a forecast based on simple exponential smoothing for the next 12 months, and plot the forecast.
Estimate an exponential smoothing model using the ets function with default parameters. Then pass the model as input to the forecast function to get a forecast for the next 12 months, and plot the forecast (both functions are from the forecast package).
Print a summary of the model estimated in the previous exercise, and find the automatically estimated structure of the model. Does it include trend and seasonal components? If those components are present are they additive or multiplicative?

Find a function in the forecast package that estimates the BATS model (exponential smoothing state space model with Box-Cox transformation, ARMA errors, trend and seasonal components). Use it to estimate the model with a damped trend, and make a forecast. Plot the forecast.
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# Importing essential libraries
library(twitteR)
library(tm)
library(qdap)
library(wordcloud)
library(topicmodels)
library(tidyr)
library(tidytext)
library(ggplot2)
library(dplyr)
library(quantmod)
library(forecast)

### Excercise 1
########################################################################
### Download data about NASA from Twitter.

consumer_key <- "QHY8vI1wOmrFtR2O6b36BkTjw"
consumer_secret <- "xyfFvSQMhyfu5PClV9XLnZvFTOXlW7T3tzLVqEjNQrFoX97P5e"
access_token <- "922981917850525696-us7uh7eIM1NK7yMw1xipWDVW7lXGL1W"
access_secret <- "sgJ3MICFlkX7Kg4nyruAQfGd54uiK0OXSGleJQijwtiXn"
setup_twitter_oauth(consumer_key,
                   consumer_secret,
                   access_token,
                   access_secret)

tweets <- userTimeline("NASA", n = 3200)
# Converting to data frame
df <- do.call("rbind", lapply(tweets, as.data.frame))
head(df)

### Clean the data
# Removing non-ascii characters
df$text <- gsub("[^\x20-\x7E]", "", df$text)
nasa.tweets <- df$text

nasa_source <- VectorSource(nasa.tweets)
df_corpus <- VCorpus(nasa_source)

corpus <- df_corpus
corpus <- tm_map(corpus, PlainTextDocument)
corpus <- tm_map(corpus, content_transformer(replace_abbreviation))
corpus <- tm_map(corpus, stripWhitespace)
corpus <- tm_map(corpus, removePunctuation)
corpus <- tm_map(corpus, bracketX)
corpus <- tm_map(corpus, PlainTextDocument)
corpus <- tm_map(corpus, removeNumbers)
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        Backtrace
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        • 22. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
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        4.11mstwenty4_siteHomeworkLibraryController.php#97
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        • 26. app/Http/Controllers/HomeworkLibraryController.php:105
        • 27. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
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      • select * from `subjects` where `subjects`.`id` in (299)
        1.11mstwenty4_siteHomeworkLibraryRepository.php#30
        Backtrace
        • 19. app/Repositories/HomeworkLibraryRepository.php:30
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      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 40743 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'question' order by `order` asc, `id` asc
        1.16mstwenty4_siteHomeworkLibrary.php#260
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        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
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        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
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        Backtrace
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