Time series are particularly useful to track variables such as revenues, costs, and profits over time. Time series models help evaluate performance and make predictions. Consider the following and respond in a minimum of 175 words:

• Time series decomposition seeks to separate the time series (Y) into 4 components: trend (T), cycle (C), seasonal (S), and irregular (I). What is the difference between these components?
• The model can be additive or multiplicative.When we do use an additive model? When do we use a multiplicative model?
• The following list gives the gross federal debt(in millions of dollars) for the U.S. every 5 years from 1945 to 2000:

Year    Gross Federal Debt ($millions)

1945    260,123

1950    256,853

1955    274,366

1960    290,525

1965    322,318

1970    380,921

1975    541,925

1980    909,050

1985    1,817,521

1990    3,206,564

1995    4,921,005

2000    5,686,338

• Construct a scatter plot with this data. Do you observe a trend? If so, what type of trend do you observe?
• Use Excel to fit a linear trend and an exponential trend to the data. Display the models and their respective r^2.
• Interpret both models. Which model seems to be more appropriate? Why?

Read five articles and discuss the principle of least privilege in at least 500 words. Explain how this principle impacts data security.

Cite your sources. Do not copy. Write in essay format not in bulleted, numbered or other list format. 

Reply to two classmates’ posting in a paragraph of at least five sentences by asking questions, reflecting on your own experience, challenging assumptions, pointing out something new you learned, offering suggestions.   You should make your initial post by Thursday evening so your classmates have an opportunity to respond before Sunday.at midnight when all three posts are due. 

It is important that you use your own words, that you cite your sources, that you comply with the instructions regarding length of your post and that you reply to two classmates in a substantive way (not ‘nice post’ or the like).  Your goal is to help your colleagues write better. Do not use spinbot or other word replacement software. It usually results in nonsense and is not a good way to learn anything. Please do not use attachments unless requested

note:-

Please use my prompts as a starting point for your discussion posts.  What I am looking for is for each student to find something different to say not to recycle the same pablum. This is a graduate program so simply writing definitions is not what we are after. Use your higher order cognitive skills (analysis, synthesis, evaluation, etc).  A solution is to find something that happened at work to explore and write about (You could, for example, explore the ransomware attack that happened at one student’s office. His solution was to encrypt the data but is that really a protection against that sort of attack? And, how did they get hacked, anyway? I wanted to know as soon as I read it ).  You could also find something at work that you want to know more about and explore that. Or, maybe, something specific in your reading or in the news attracts your eye. For example, the Russian hacking of election systems or the Chinese hack of the US navy. Lately, I’ve been intrigued by stories of people hacking the hackers. Find something that makes you want to do the research and writing.