怎样计算R2值？
一下是origin9中对R Square的解释：
R-Square (COD)
The R2 value shows the goodness of a fit, and can be computed by:
(21)
where TSS is the total sum of square, and RSS is the residual sum of square.
大致：R-square（R2，决定系数）表达了拟合的好坏程度度（相关度），计算公式...，TSS为总平方和，RSS为残差平方和，RSS表示误差，越小越好，因此从计算公式来看，拟合越好，误差越小，R-square就越大，为1就是最好的鸟，没有大于。R2对少量参数（方程中只有一两个参数）的拟合表达较为准确，但对多参数情况需要修正，有兴趣自己查查adjust. R2（调整决定系数）。
绛旓細r1=9/1.5=6ou 闂悎鍚庯細 6v/6ou=1A r2=锛9-6锛/1A=3ou
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绛旓細R1銆R2鏄斁鐢电數闃,R1搴旇鍙栫┖杞界洿娴佺數鍘嬫渶澶у,250*1.414 浼,1M hom,浣犺兘绠楀嚭鏈澶у姛鐜囥...,0,LED鐢佃矾閲岄潰鐨凴2鐨勯樆鍊煎拰鍔熺巼濡備綍纭畾?鏁翠釜鐢佃矾鐨勭數娴佸浣曠‘瀹? 濡傚浘鎵绀:鎴戣鐭ラ亾:1銆佺數璺噷闈㈢殑R2鐨勯樆鍊煎拰鍔熺巼濡備綍璁＄畻?2銆佸亣濡傚彧鏈変竴璺疉/B,瀹冪殑鐢垫祦鏄20MA,濡傛灉鍦ㄥ苟涓婁竴璺疌/D鐨勮瘽,鐢垫祦鏄笉鏄彧鏈10MA...
绛旓細R2绯绘暟鏄喅瀹氱郴鏁帮紝瀹冨弽鏄犱簡鍥犲彉閲忕殑鍏ㄩ儴鍙樺紓涓湁澶氬皯鐧惧垎姣旇兘琚嚜鍙橀噺瑙ｉ噴銆璁＄畻鍏紡涓猴細$$R^2=1-frac{sum_{i=1}^{n}(y_i-bar{y})^2}{sum_{i=1}^{n}(y_i-overline{y})^2}$$鍏朵腑锛$n$琛ㄧず鏁版嵁鐐逛釜鏁帮紝$bar{y}$琛ㄧず鎵鏈夋暟鎹偣鐨勫钩鍧囧硷紝$y_i$琛ㄧず绗$i$涓暟鎹偣鐨勫疄闄呭笺...
绛旓細R2鎸囩殑鏄浉鍏崇郴鏁帮紝涓鑸満鍣ㄩ粯璁ょ殑鏄疪2>0.99锛岃繖鏍锋墠鍏锋湁鍙搴﹀拰绾挎у叧绯汇傚綋鏍规嵁璇曢獙鏁版嵁杩涜鏇茬嚎鎷熷悎鏃讹紝璇曢獙鏁版嵁涓庢嫙鍚堝嚱鏁颁箣闂寸殑鍚诲悎绋嬪害锛岀敤涓涓笌鐩稿叧绯绘暟鏈夊叧鐨勪竴涓噺鈥楻骞虫柟鈥欐潵璇勪环锛孯^2鍊艰秺鎺ヨ繎1锛屽惢鍚堢▼搴﹁秺楂橈紝瓒婃帴杩0锛屽垯鍚诲悎绋嬪害瓒婁綆銆俁骞虫柟鍊煎彲浠ヨ嚜宸璁＄畻銆傜浉鍏崇郴鏁帮細琛ㄧず浣犵殑鏇茬嚎鐨...
绛旓細14.4/(R1+R2)X R2=5 瑙ｈ繖涓叧绯诲紡灏卞彲鑳藉緱鍑轰綘瑕佺殑鍙傛暟 姣旇緝绠鍗曠殑鏄粰瀹歊1R2涓殑鐢垫祦锛堜竴鑸彇杈撳嚭鐢垫祦10-20鍊) 鐒跺悗鎸変笅寮璁＄畻锛歊1+R2=14.4/ I 5/I=R2
绛旓細涓涓嬫槸origin9涓R Square鐨勮В閲婏細R-Square (COD)The R2 value shows the goodness of a fit, and can be computed by:(21)where TSS is the total sum of square, and RSS is the residual sum of square.澶ц嚧锛歊-square锛圧2锛屽喅瀹氱郴鏁帮級琛ㄨ揪浜嗘嫙鍚堢殑濂藉潖绋嬪害搴︼紙鐩稿叧搴︼級锛璁＄畻鍏紡......
绛旓細浜屻丷2鐨璁＄畻鏂瑰紡 R2鐨勮绠楁槸鍩轰簬瀹為檯瑙傛祴鍊间笌妯″瀷棰勬祴鍊间箣闂寸殑鍋忓樊銆傝繖涓艰秺灏忥紝琛ㄧず妯″瀷棰勬祴鍊间笌鐪熷疄鏁版嵁涔嬮棿鐨勫樊璺濊秺澶э紝妯″瀷鐨勬嫙鍚堟晥鏋滆秺宸紱鍙嶄箣锛R2鍊瓒婂ぇ锛岃〃绀烘ā鍨嬭兘鏇村ソ鍦拌В閲婃暟鎹棿鐨勫叧鑱旀с傚叿浣撶殑璁＄畻鏂规硶鏄氳繃瀵规ā鍨嬭宸钩鏂规眰鍜屽啀涓庢暟鎹诲彉寮傝繘琛屾瘮杈冨緱鍒扮殑銆傚疄闄呮搷浣滀腑閫氬父浼氱敤鍒颁笓闂ㄧ殑...
绛旓細涓茶仈锛孯1+R2=6/0.3=20 骞惰仈锛孖鎬=I1+I2=6/R1+6/R2=1.25 R1+R2=20 6/R1+6/R2=1.25 瑙ｆ柟绋 鐗╃悊棰橈紝鍦ㄧ數瀛︽柟闈紝璺熺潃棰樼殑鎬濊矾鎶婂悇涓暟鎹殑鍏崇郴鍒楀嚭鏉ワ紝鍩烘湰灏卞彲浠ヨВ浜嗭紒
绛旓細鐢甸樆R1鍜岀數闃R2涓茶仈鍚庯紝绛夋晥涓猴細R涓=R1+R2 鐢甸樆R1鍜岀數闃籖2骞惰仈鍚庯紝绛夋晥涓猴細(1/R骞)=(1/R1)+(1/R2) 锛屾垨R骞=(R1*R2)/(R1+R2) 骞惰仈鐢佃矾锛氬苟鑱旂殑鍚勬敮璺數鍘嬬浉绛夛紝骞茶矾鐢垫祦绛変簬鍚勪釜鏀矾鍜屻傝〃杈惧紡锛氱數闃籖1R2R3鈥︹n骞惰仈锛岀數鍘婾1=U2=鈥︹=Un骞茶矾鐢垫祦锛欼n=I1+I2+鈥...
