nutshell (version 1.02)

sanfrancisco.home.sales: San Franciscio Home Sales Data

Description

This data contains information on homes sold in San Francisco between 2/13/2008 and 7/14/2009.

Usage

data(sanfrancisco.home.sales)

source

Data was assembled from a variety of sources including http://www.sfgate.com http://www.mercurynews.com http://www.zillow.com/howto/api/neighborhood-boundaries.htm

Details

This data set was assembled from a variety of sources, including two Bay area newspapers (the San Jose Mercury News and the San Francisco Chronicle), Yahoo Maps, and Zillow Neighborhood Boundaries.

This data set is used as an example in the book "R in a Nutshell" from O'Reilly Media. In the book, we took separate samples for training and testing. Indices for observations in each sample are included in sanfrancisco.home.sales.testing.indices and sanfrancisco.home.sales.training.indices.

Examples

data(sanfrancisco.home.sales)
library(lattice)
trellis.par.set(fontsize=list(text=7))
dollars.per.squarefoot <- mean(
  sanfrancisco.home.sales$price / sanfrancisco.home.sales$squarefeet,
  na.rm=TRUE);
xyplot(price~squarefeet|neighborhood,
        data=sanfrancisco.home.sales,
        pch=19, 
        cex=.2,
        subset=(zip!=94100 & zip!=94104 & zip!=94108 & 
                zip!=94111 & zip!=94133 & zip!=94158 &
                price<4000000 &
                ifelse(is.na(squarefeet),FALSE,squarefeet<6000)),
        strip=strip.custom(strip.levels=TRUE, 
           horizontal=TRUE,
           par.strip.text=list(cex=.8)),
        panel=function(...) {
           panel.abline(a=0,b=dollars.per.squarefoot);
           panel.xyplot(...);
        }
)