Statbeans

Calculation STATBEANS®

 

STATBEAN Name: Correlations

 

Purpose: Let's Statgraphics function as correlation analysis software to calculate correlation in statistics. Computes product-moment and rank correlation coefficients between pairs of numeric columns.

DataSource: Any. 

Correlation Analysis Software Read/Write Properties
Name Type Description Possible Values Default Value
columnNames String array The names of the columns to be analyzed. One or more strings. {""}
computeRankCorrelations boolean Whether to compute rank correlations as well as product-moment correlations. true,false false
missingValueExclusion String The method for handling records which contain missing values. "Columnwise","Casewise",
"Tablewise"		 "Columnwise"

Other Public Methods For Correlation In Statistics
Name Description Arguments Return Value
double getCorrelation(int columnNumber,int rowNumber) Returns product-moment correlation. Column number, row number (0 origin). Estimated correlation, or missingValueCode if n<2.
double getPValue(int columnNumber,int rowNumber) Returns P-value for two-sided test of null hypothesis that correlation = 0. Column number, row number (0 origin). P-value.
double getRankCorrelation(int columnNumber,int rowNumber) Returns Spearman rank correlation. Column number, row number (0 origin). Estimated correlation, or missingValueCode if n<2.
double getRankPValue(int columnNumber,int rowNumber) Returns P-value for two-sided test of null hypothesis that rank correlation = 0. Column number, row number (0 origin). P-value.
int getNumberOfVariables() Returns number of columns. None. Number of columns (and rows).
int getSampleSize(int columnNumber,int rowNumber) Returns number of pairs of data values used to calculate correlation. Column number, row number (0 origin). n
Correlation Analysis Software Code Sample 

//create a filedatasource bean 
FileDataSource fileDataSource1 = new FileDataSource(); 

//set the file name 
fileDataSource1.setFileName("c:\\statbeans\\samples\\cardata.txt"); 

//create a calculation bean 
Correlations correlations1 = new Correlations(); 

//set missing value handling 
correlations1.setMissingValueExclusion("Columnwise"); 

//set the column names 
String[] temp = new String[5]; 
temp[0] = new String("mpg"); 
temp[1] = new String("weight"); 
temp[2] = new String("horsepower"); 
temp[3] = new String("displace"); 
temp[4] = new String("price"); 
correlations1.setColumnNames(temp); 

//create a table bean 
CorrelationsTable correlationsTable1 = new CorrelationsTable(); 

//set table size 
correlationsTable1.setScaleRowsToFit(false); 
correlationsTable1.setScaleColumnsToFit(false); 
correlationsTable1.setNumberOfRowsInDisplay(15); 
correlationsTable1.setNumberOfColumnsInDisplay(5); 

//prevent some rows and columns from scrolling 
correlationsTable1.setHoldRows(3); 
correlationsTable1.setHoldColumns(1); 

//add the table to the display panel 
add(correlationsTable1); 

//register the calculation StatBean as a listener to the datasource 
fileDataSource1.addDataChangeListener(correlations1.listenerForDataChange); 

//register the table StatBean as a listener to the calculation StatBean 
correlations1.addDataChangeListener(correlationsTable1.listenerForDataChange); 

//read the file 
fileDataSource1.readData(); 

//notify all listeners 
fileDataSource1.updateListeners();
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