iNZight for Beginners
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Transcript iNZight for Beginners
iNZight Insights
in the beginning…
Whangarei PD Day
May 6th 2013
Jim Hogan
My Goals Today
Have you gain confidence to explore this software
Make you aware of where to find resources
Help you appreciate when to use iNZight
Become an iNZight user
Have fun being a learner again.
What are your goals?
Plan of Nec Slides
Downloading and installing on Mac or PC
Basic history, ownership and use
Starting it up
Data and variables
Graphs (dots, bars and boxes)
PPDAC and Inference
Discussion of when to use (and when not to use)
PPDAC and “on the second day…”
Downloading and Installing
Download http://www.stat.auckland.ac.nz/~wild/iNZight/,
unzip and notice where you put it all.
To begin find the “START_INZIGHT.command”
Double click the ICON and way we go
Investigate this website!
iNZight History…
iNZight has been primarily supported by The
University of Auckland, Department of Statistics
with additional support from Statistics New Zealand
and the NZ Ministry of Education via Census at
School NZwebsite
Useless info…it is written in R, which is a subset of S a global
used computer language for statistics. oh…
…designed for our schools
Initially designed for New Zealand high schools,
iNZight now extends to multivariable graphics, time
series and linear models.
A simple data analysis system which encourages
exploring what data is saying without the
distractions of driving complex software
Getting data
I suggest that you import .csv files
After
“conditioning” the data in Excel
Taking a sample
Getting rid of nonsense
Tidying and ordering
And so on.
Develop a system that works for you… .csv
Making a .csv file
In Excel select the file type you want.
Data and Variables
Categorical data are things like words. One does not
add words. Telephone numbers are categorical data.
The sum of two telephone numbers does not mean a
lot.
Numerical data can be added and multiplied.
Numerical data can be converted to categorical data.
Why might we do this?
Dot Plots and Boxes
Rather easy to make
Drag some numerical data into the variable.
Bar graph
Drag some categorical data into the variable
PPDAC
Ask a sensible question
“I wonder if the weight of female trout in the Lake
Taupo 1993 are heavier than the males?”
Why would I want to know this? Hmmmm…
ppdAc
We see…
ppdaC
And by any measure, especially the eyes, the answer is
…
Conclusion
The female trout in the 1993 Lake Taupo are not
heavier than the males.
The answer is not NO
The answer is not that there is no difference
The answer is not the males are heavier
ATFQ
The answer is as above.
A better question?
I wonder if the trout caught by FF are bigger than the
trout caught by any other method.
Reason…I want to catch a big trout
Task, you answer this.
When to use iNZight
Discussion time…
When to use iNZight…
My view is
not before students are ready
that means
when they tell you how to
draw a dot plot and bar graph
draw a box and whisker and tell you everything about it
not before and can describe distributions using their eyes.
REASON
----------------
Reason
Reason
This is very powerful software and they will
take the short cut and use it before
understanding what it all means. So if you
want to create a rod for your own back then
show them how to use it.
Year 7/8 – never
Year 9/10 – only when they are
multiplicative, know fractions and can
explain that 25% of the data is in each of
box parts. What min, LQ, med, UQ, IQR,
max all mean.
Year 11 – Use deeply.
Use any time as a
teaching tool for visual
stuff.
Let’s play and discover more
questions
Hands on, get dirty!
Are there two species of dolphins in NZ waters?
What is your best approach to catching a big trout?
Time series?