PHP实现简单线性回归之数据研究工具

 
＜?php  

  // HTML.php  

  // Copyright 2003, Paul Meagher  
  // Distributed under GPL    

  include_once "slr/SimpleLinearRegression.php";  

  class SimpleLinearRegressionHTML extends SimpleLinearRegression {  

    function SimpleLinearRegressionHTML($X, $Y, $conf_int) {  
      SimpleLinearRegression::SimpleLinearRegression($X, $Y, $conf_int);  
    }  

    function showTableSummary($x_name, $y_name) { }  
        
    function showAnalysisOfVariance() { }  

    function showParameterEstimates() { }  

    function showFormula($x_name, $y_name) { }  

    function showRValues() {}  
  }  

  ?＞  

 
＜?php  

  // Snippet extracted from explore.php script  

  include ("jpgraph/jpgraph.php");  
  include ("jpgraph/jpgraph_scatter.php");  
  include ("jpgraph/jpgraph_line.php");  

  // Create the graph  
  $graph = new Graph(300,200,'auto');  
  $graph-＞SetScale("linlin");  

  // Setup title    
  $graph-＞title-＞Set("$title");  
  $graph-＞img-＞SetMargin(50,20,20,40);     
  $graph-＞xaxis-＞SetTitle("$x_name","center");  
  $graph-＞yaxis-＞SetTitleMargin(30);       
  $graph-＞yaxis-＞title-＞Set("$y_name");   

  $graph-＞title-＞SetFont(FF_FONT1,FS_BOLD);  

  // make sure that the X-axis is always at the  
  // bottom at the plot and not just at Y=0 which is  
  // the default position    
  $graph-＞xaxis-＞SetPos('min');  

  // Create the scatter plot with some nice colors  
  $sp1 = new ScatterPlot($slr-＞Y, $slr-＞X);  
  $sp1-＞mark-＞SetType(MARK_FILLEDCIRCLE);  
  $sp1-＞mark-＞SetFillColor("red");  
  $sp1-＞SetColor("blue");  
  $sp1-＞SetWeight(3);  
  $sp1-＞mark-＞SetWidth(4);  

  // Create the regression line  
  $lplot = new LinePlot($slr-＞PredictedY, $slr-＞X);  
  $lplot-＞SetWeight(2);  
  $lplot-＞SetColor('navy');  

  // Add the pltos to the line  
  $graph-＞Add($sp1);  
  $graph-＞Add($lplot);  

  // ... and stroke  
  $graph_name = "temp/test.png";  
  $graph-＞Stroke($graph_name);  
  ?＞  
  ＜img src='＜?php echo $graph_name ?＞' vspace='15'＞  

  ?＞