利用spss进行异方差检验的方法，望借鉴

馨冉回忆

1. 用图表检验Analyze -> regression -> Linear-> Plots
; A3 b8 H1 G9 H" m( ~; Q, g+ p4 o- dScatter plot of the standardised residuals on the standardised predicted values (ZRESID as  the Y variable, and ZPRED as the X variable

" j( L0 s8 A% P9 m- W8 `如果图表显示有可能存在异方差，需要用统计检验来进一步检测异方差是否确实存在。
2. 用统计检验
& X$ E# J) R7 ?4 P1 A  K& dHeteroscedasticity——Testing and Correcting in SPSS.pdf Gwilym Pryce March 2002.doc (172.5 KB, 下载次数: 4)

2013-10-13 16:09 上传

点击文件名下载附件
下载积分: 体力 -2 点

" w0 x3 E# h% }+ y/ c  f

Levene’s Test
+ W1 b- C* n- D+ @8 @Goldfeld-Quandt Test
Breusch-Pagan Test
White‘s Test （比较常用来检验异方差）

Assume you want to run a regression of wage on age, work experience,education, gender, and a dummy for sectorofemployment (whether employed in the public sector).

wage = function(age, workexperience, education, gender, sector)

or, as your textbook will have it,

wage = b1 + b2*age + b3*work experience+ b4*education + b5*gender + b6*sector

The White’s test is usually used as a test for heteroskedasticity.  In this test, a regression of the squares ofthe residuals is run on the variables suspected of causing theheteroskedasticity, their squares, and cross products.

(residuals)2 = b0 + b1 educ + b2 work_ex+ b3 (educ)2  + b4 (work_ex)2 + b5(educ*work_ex)

3 [4 y* r  C* n0 `! a' @  e7 ~% o

5 A" J5 z3 }! Y. y7 V
3 d0 F/ o5 Z6 t2 F/ T  B* c

White’s Test

·        Calculate n*R2                            à              R2  = 0.037, n=2016           à    Thus, n*R2 = .037*2016 = 74.6.

2 Q  a& N. k* M% g9 l; z- G+ R

·        Compare this value with c2 (n), i.e.with  c2 (2016)  
(c2  is the symbol for theChi-Square distribution)

c2 (2016) = 124obtained from c2 table.            (For 955 confidence)              As n*R2  < c2 ,heteroskedasticity can not be confirmed.

8 Q* |. K) ~! ^3 t8 g8 V
请参考：regression_explained_SPSS regression_explained_SPSS.doc (368 KB, 下载次数: 0)

2013-10-13 16:12 上传

点击文件名下载附件
下载积分: 体力 -2 点

) N' E. [3 w. i! C( v