PHP实现简单线性回归之数据研究工具

 
＜?php  

  // explore.php  

  if (!empty($x_values)) {  
    $X    = explode(",", $x_values);  
    $numX = count($X);  
  }    

  if (!empty($y_values)) {  
    $Y    = explode(",", $y_values);  
    $numY = count($Y);  
  }    

  // display entry data entry form if variables not set  

  if ( (empty($title)) OR (empty($x_name)) OR (empty($x_values)) OR   
       (empty($y_name)) OR (empty($conf_int)) OR (empty($y_values)) OR   
       ($numX != $numY) ) {           

    // Omitted code for displaying entry form  
      
  } else {  
      
    include_once "slr/SimpleLinearRegressionHTML.php";                        
    $slr = new SimpleLinearRegressionHTML($X, $Y, $conf_int);     

    echo "＜h2＞$title＜/h2＞";  
      
    $slr-＞showTableSummary($x_name, $y_name);  
    echo "＜br＞＜br＞";  
      
    $slr-＞showAnalysisOfVariance();    
    echo "＜br＞＜br＞";  

    $slr-＞showParameterEstimates($x_name, $y_name);   
    echo "＜br＞";  

    $slr-＞showFormula($x_name, $y_name);  
    echo "＜br＞＜br＞";  

    $slr-＞showRValues($x_name, $y_name);  
    echo "＜br＞";  

    include ("jpgraph/jpgraph.php");  
    include ("jpgraph/jpgraph_scatter.php");  
    include ("jpgraph/jpgraph_line.php");    
                        
    // The code for displaying the graphics is inline in the  
    // explore.php script.  The code for these two line plots  
    // finishes off the script:  
      
    // Omitted code for displaying scatter plus line plot  
    // Omitted code for displaying residuals plot  
      
  }  

  ?＞