demo/baseball-correlation.R

In teradata-aster-field/toaster: Big Data in-Database Analytics that Scales with Teradata Aster Distributed Platform

#' @demoTitle baseball-correlation
#' 
#' Demo correlation matrix
#'
#' To install and use baseball demo dataset in Aster:
#'
#' 1. download baseball.zip from
#'   https://bitbucket.org/grigory/toaster/downloads/baseball.zip
#' 2. run script to create data set in Aster
#'   sh load_baseball_data.sh -d mydbname -U username -w mypassword 
#' 3. create Aster ODBC DSN on your desktop
#'   see https://bitbucket.org/grigory/toaster/wiki/Home#markdown-header-odbc-driver-and-dns

library(toaster)

## utility input function
readlineDef <- function(prompt, default) {
  if (!is.null(prompt))
    prompt = paste0(prompt, "[", default, "]: ")
  else 
    prompt = paste0(prompt, ": ")
  
  result = readline(prompt)
  if (result == "") 
    return (default)
  else
    return (result)
}

## utility connection function
connectWithDSNToAster <- function(dsn=NULL) {
  dsn = readlineDef("Enter Aster ODBC DSN: ", dsn)
  
  tryCatch(close(conn), error=function(err) {NULL})
  
  conn = tryCatch({
    conn = odbcConnect(dsn)
    odbcGetInfo(conn)
    return (conn)
  }, error=function(err) {
    stop(paste("Can't connect to Aster - check DSN '", dsn, "'"))
  })
}

## connect to Aster first
conn = connectWithDSNToAster()

## must be connected to baseball dataset
if(!all(isTable(conn, c('pitching_enh')))) {
  stop("Must connect to baseball dataset and tables must exist.")
}

# Pitcher Metrics correlation Matrix
cormat = computeCorrelations(channel=conn, "pitching_enh", sqlColumns(conn, "pitching_enh"),
                             include = c('w','l','cg','sho','sv','ipouts','h','er','hr','bb','so','baopp',
                             'era','whip','ktobb','fip'),
                             where = "decadeid = 2000", test=FALSE)

cormat = cormat[cormat$metric1 < cormat$metric2, ]
cormat$value = round(cormat$value, 2)
createBubblechart(cormat, "metric1", "metric2", "value", fill="sign", legendPosition="none")