{"id":1649,"date":"2023-07-25T12:50:55","date_gmt":"2023-07-25T12:50:55","guid":{"rendered":"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/"},"modified":"2023-07-25T12:50:55","modified_gmt":"2023-07-25T12:50:55","slug":"raccordo-curva-pitone","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/","title":{"rendered":"Adattamento della curva in python (con esempi)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Spesso potresti voler adattare una curva a un set di dati in Python.<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16261 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbepython3.png\" alt=\"\" width=\"392\" height=\"265\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Il seguente esempio passo passo spiega come adattare le curve ai dati in Python utilizzando la funzione <a href=\"https:\/\/numpy.org\/doc\/stable\/reference\/generated\/numpy.polyfit.html\" target=\"_blank\" rel=\"noopener\">numpy.polyfit()<\/a> e come determinare quale curva si adatta meglio ai dati.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Passaggio 1: creare e visualizzare i dati<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Iniziamo creando un set di dati falso, quindi creiamo un grafico a dispersione per visualizzare i dati:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n<span style=\"color: #008000;\">import<\/span> matplotlib. <span style=\"color: #3366ff;\">pyplot<\/span> <span style=\"color: #008000;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#createDataFrame\n<\/span>df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">x<\/span> ': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],\n                   ' <span style=\"color: #ff0000;\">y<\/span> ': [3, 14, 23, 25, 23, 15, 9, 5, 9, 13, 17, 24, 32, 36, 46]})\n\n<span style=\"color: #008080;\">#create scatterplot of x vs. y\n<\/span>plt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16259 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbepython1.png\" alt=\"\" width=\"399\" height=\"269\" srcset=\"\" sizes=\"\"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Passaggio 2: regola pi\u00f9 curve<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Adattiamo quindi diversi modelli di regressione polinomiale ai dati e visualizziamo la curva di ciascun modello nello stesso grafico:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n\n<span style=\"color: #008080;\">#fit polynomial models up to degree 5\n<\/span>model1 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 1))\nmodel2 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 2))\nmodel3 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 3))\nmodel4 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 4))\nmodel5 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 5))\n\n<span style=\"color: #008080;\">#create scatterplot\n<\/span>polyline = np. <span style=\"color: #3366ff;\">linspace<\/span> (1, 15, 50)\nplt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )\n\n<span style=\"color: #008080;\">#add fitted polynomial lines to scatterplot \n<\/span>plt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model1(polyline), color=' <span style=\"color: #ff0000;\">green<\/span> ')\nplt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model2(polyline), color=' <span style=\"color: #ff0000;\">red<\/span> ')\nplt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model3(polyline), color=' <span style=\"color: #ff0000;\">purple<\/span> ')\nplt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model4(polyline), color=' <span style=\"color: #ff0000;\">blue<\/span> ')\nplt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model5(polyline), color=' <span style=\"color: #ff0000;\">orange<\/span> ')\nplt. <span style=\"color: #3366ff;\">show<\/span> ()\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16260 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbepython2.png\" alt=\"\" width=\"408\" height=\"279\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Per determinare quale curva si adatta meglio ai dati, possiamo osservare il <a href=\"https:\/\/statorials.org\/it\/r-quadrati-in-r-si-adatta\/\" target=\"_blank\" rel=\"noopener\">quadrato R corretto<\/a> di ciascun modello.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Questo valore indica la percentuale di variazione nella variabile di risposta che pu\u00f2 essere spiegata dalle variabili predittive nel modello, adattata al numero di variabili predittive.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define function to calculate adjusted r-squared\n<span style=\"color: #000000;\"><span style=\"color: #008000;\">def<\/span> adjR(x, y, degree):\n    results = {}\n    coeffs = np. <span style=\"color: #3366ff;\">polyfit<\/span> (x, y, degree)\n    p = np. <span style=\"color: #3366ff;\">poly1d<\/span> (coeffs)\n    yhat = p(x)\n    ybar = np. <span style=\"color: #3366ff;\">sum<\/span> (y)\/len(y)\n    ssreg = np. <span style=\"color: #3366ff;\">sum<\/span> ((yhat-ybar)**2)\n    sstot = np. <span style=\"color: #3366ff;\">sum<\/span> ((y - ybar)**2)\n    results[' <span style=\"color: #ff0000;\">r_squared<\/span> '] = 1- (((1-(ssreg\/sstot))*(len(y)-1))\/(len(y)-degree-1))\n\n    <span style=\"color: #008000;\">return<\/span> results<\/span>\n\n#calculated adjusted R-squared of each model\n<\/span>adjR(df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 1)\nadjR(df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 2)\nadjR(df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 3)\nadjR(df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 4)\nadjR(df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 5)\n\n{'r_squared': 0.3144819}\n{'r_squared': 0.5186706}\n{'r_squared': 0.7842864}\n{'r_squared': 0.9590276}\n{'r_squared': 0.9549709}\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Dal risultato, possiamo vedere che il modello con l&#8217;R quadrato corretto pi\u00f9 alto \u00e8 il polinomio di quarto grado, che ha un R quadrato corretto di <strong>0,959<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Passaggio 3: Visualizza la curva finale<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Infine, possiamo creare un grafico a dispersione con la curva del modello polinomiale di quarto grado:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#fit fourth-degree polynomial\n<\/span>model4 = np. <span style=\"color: #3366ff;\">poly1d<\/span> (np. <span style=\"color: #3366ff;\">polyfit<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> , 4))\n\n<span style=\"color: #008080;\">#define scatterplot\n<\/span>polyline = np. <span style=\"color: #3366ff;\">linspace<\/span> (1, 15, 50)\nplt. <span style=\"color: #3366ff;\">scatter<\/span> (df. <span style=\"color: #3366ff;\">x<\/span> , df. <span style=\"color: #3366ff;\">y<\/span> )\n\n<span style=\"color: #008080;\">#add fitted polynomial curve to scatterplot\n<\/span>plt. <span style=\"color: #3366ff;\">plot<\/span> (polyline, model4(polyline), ' <span style=\"color: #ff0000;\">--<\/span> ', color=' <span style=\"color: #ff0000;\">red<\/span> ')\nplt. <span style=\"color: #3366ff;\">show<\/span> ()\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16261 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbepython3.png\" alt=\"\" width=\"392\" height=\"265\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Possiamo anche ottenere l&#8217;equazione per questa riga utilizzando la funzione <strong>print()<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #993300;\">print<\/span> (model4)\n\n          4 3 2\n-0.01924x + 0.7081x - 8.365x + 35.82x - 26.52\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">L\u2019equazione della curva \u00e8 la seguente:<\/span><\/p>\n<p> <span style=\"color: #000000;\">y = -0,01924x <sup>4<\/sup> + 0,7081x <sup>3<\/sup> \u2013 8,365x <sup>2<\/sup> + 35,82x \u2013 26,52<\/span><\/p>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare questa equazione per prevedere il valore della <a href=\"https:\/\/statorials.org\/it\/variabili-risposte-esplicative\/\" target=\"_blank\" rel=\"noopener\">variabile di risposta<\/a> in base alle variabili predittive nel modello. Ad esempio, se <em>x<\/em> = 4, allora dovremmo prevedere che <em>y<\/em> = <strong>23,32<\/strong> :<\/span><\/p>\n<p> <span style=\"color: #000000;\">y = -0,0192(4) <sup>4<\/sup> + 0,7081(4) <sup>3<\/sup> \u2013 8,365(4) <sup>2<\/sup> + 35,82(4) \u2013 26,52 = 23,32<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/it\/regressione-polinomiale-1\/\" target=\"_blank\" rel=\"noopener\">Un&#8217;introduzione alla regressione polinomiale<br \/><\/a> <a href=\"https:\/\/statorials.org\/it\/python-di-regressione-polinomiale\/\" target=\"_blank\" rel=\"noopener\">Come eseguire la regressione polinomiale in Python<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Spesso potresti voler adattare una curva a un set di dati in Python. Il seguente esempio passo passo spiega come adattare le curve ai dati in Python utilizzando la funzione numpy.polyfit() e come determinare quale curva si adatta meglio ai dati. Passaggio 1: creare e visualizzare i dati Iniziamo creando un set di dati falso, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Curve Fitting in Python (con esempi) - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come adattare le curve in Python, con diversi esempi.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Curve Fitting in Python (con esempi) - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come adattare le curve in Python, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T12:50:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbepython3.png\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/\",\"url\":\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/\",\"name\":\"Curve Fitting in Python (con esempi) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-25T12:50:55+00:00\",\"dateModified\":\"2023-07-25T12:50:55+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come adattare le curve in Python, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/raccordo-curva-pitone\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Adattamento della curva in python (con esempi)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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