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NZAMT NZQA NZ Grapher NZ Maths Census at School Study It

3.8 Time Series HOME | Achievement Objectives | Overview | The Statistics Cycle
NZ Grapher: The best choice | iNZight: Getting Started , Importing Data
Using EXCEL: Smoothing, Trend, Seasonal Effects, Graphing, Forecasts, Seasonal Adjustment, Non-Linear models, Comparing Excel & iNZight
Report Writing: Summary | Introduction | Trend | Decompose | Recompose | Seasonal Effect | Forecasts | Robustness | Additive vs Multiplicative model | Comparing | Combining | Conclusion | Practice Assessment

Creating new variables

10

 

Create new variables

(Excellence)
When planning to combine variables together to create a new variable to investigate, think carefully as to the PURPOSE of the new variable. What are you wanting to show? Why is the new variable useful?

Discuss why the new variable has been added.
Discuss the further insight and information provided by the new variable

 

Word docs Class notespdf

EXEMPLARS:
Use iNZight to produce a time series graph and add the trend line. Copy this into your report and discuss

- Alcohol Consumptn: Data csv,| Word Worksheet | Google Doc class write up

- Travel Destination Data csv | Word Write up | Google Doc class work

- Travel Purposes: Data csv

- Electricity Production: Data csv | (Website)

 

Creating New Variables by Combining Variables

'Manipulate Variables' tab & the 'Create New Variables'

Think carefully as to the PURPOSE of the new variable.

The new variable needs to add to the investigation and provide further insight - (not just a variable for the sake of a variable)

eg A supermarket Sales seem to be increasing. Is this due to business practices or just due to population growth in the surrounding area?

A new variable of Supermarket Sales ÷ City Population would be useful

Be very careful to spell the existing variables correctly

To make this easier, you can click on the 'view variables' icon above the data set. From there, you can drag and drop the headings into your new variable equation. This helps avoid typos and issues with capitalisation and spelling.

The time series graph of the new variable should provide further information worthy of discussion

 

The new variable can be compared to existing ones

Discuss why the new variable has been added.

Discuss the further insight and information provided by the new variable

 

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