iNZight Insightsin the beginning…

Whangarei PD Day

May 6th 2013

Jim Hogan

My Goals TodayHave 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 SlidesDownloading 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 InstallingDownload 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 schoolsInitially 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 dataI suggest that you import .csv files

After

“conditioning” the data in ExcelTaking a sampleGetting rid of nonsenseTidying and ordering

And so on.

Develop a system that works for you… .csv

Making a .csv fileIn Excel select the file type you want.

Data and VariablesCategorical 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 BoxesRather easy to make

Drag some numerical data into the variable.

Bar graphDrag some categorical data into the variable

PPDACAsk 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…

ppdAcWe see…

ppdaCAnd by any measure, especially the eyes, the

answer is …

ConclusionThe 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 iNZightDiscussion time…

When to use iNZight…My view is

not before students are readythat 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?