Recap

• Always be suspicious of summary statistics
  • What is the underlying distribution?
  • Has the structure of the data changed?
  • What is being compared?
• Don’t be afraid to google or ask “What is a median?”

Today

Practical session

Get out your computers!

Inflation adjusted median household income

Median incme

• NZ.Stats
  • I’m going mad
  • On a release day data is removed…

Inflation data

• Infoshare
  • Economic Indicatiors -> Consumers Price Index (CPI)
  • Ohoh
  • Take a look on the Reserve bank site
  • Seasonally adjusted or not? (Compare to Reserve Bank)

PriceNow = PriceThen * IndexNow / IndexThen

Police Data

• policedata.nz

• Is Auckland or Christchurch worse for crimes involving firearms?

• Where and when do the most assaults occur?

• Is burglary increasing?

• Compare “Taking things crime” in Upper and Lower Hutt.