豆子編製 4/14/2013
Descriptive StatisticsNITEM_1ITEM_3ITEM_5ITEM_2ITEM_4ITEM_6Valid N(listwise)5555555
Sum313434Mean.60.20.60.80.60.80透過平均值可看出其難度
平均高的難度低 平均低的難度高
排序由難度低到高2 6 1 4 5 3，在丟入變項時依單偶分為：2 1 5、6 4 3兩組，排列數據時前後排列。
Correlations
CorrelationsSSPearsonCorrelationSig. (2-tailed)NPearsonCorrelationSig. (2-tailed)N1.5.0001.0005F.0001.00051.5F Correlations
****** Method 1 (space saver) will be used for this analysis ****** R E L I A B I L I T Y A N A L Y S I S - S C A L E (S P L I T) Reliability Coefficients
N of Cases = 5.0 N of Items = 6
Correlation between forms = .0000 Equal-length Spearman-Brown = .0000 Guttman Split-half = .0000 Unequal-length Spearman-Brown = .0000 >Note # 11999
>The correlation between forms (halves) of the test is negative. This >violates reliability model assumptions. Statistics which are functions of
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豆子編製 4/14/2013
>this value may have estimates outside theoretically possible ranges. 3 Items in part 1 3 Items in part 2
Alpha for part 1 = -.9000 Alpha for part 2 = .6923
【肆】 內部一致性（Internal Consistency Coefficient）【計算α係數】
有5題問答題的隨測驗施測5名學生，每題問答題配分是5分，以下是施測結果，請計算信度。 person Joe Sam Sue Peg Gil Item 1 3 4 2 4 3 Item 2 4 3 3 4 2 Item 3 4 4 3 5 4 Item 4 3 3 2 3 3 Item 5 5 3 3 4 3 步驟一 輸入資料
步驟二 按【Analyze】→【Scale】→【Reliability Analysis】
將左邊方格內的變項全選入右邊items的方格內，在左下角
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豆子編製 4/14/2013
的Model框中選取Alpha後按鍵。
步驟三 出現下列對話框候選取下列勾選處，後按
鍵
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豆子編製 4/14/2013
按。
Reliability
****** Method 2 (covariance matrix) will be used for this analysis ****** R E L I A B I L I T Y A N A L Y S I S - S C A L E (A L P H A) Correlation Matrix
ITEM_1 ITEM_2 ITEM_3 ITEM_4 ITEM_5 ITEM_1 1.0000
ITEM_2 .2970 1.0000
ITEM_3 .7647 .5941 1.0000
ITEM_4 .6860 .4330 .8575 1.0000
ITEM_5 .1588 .8018 .4763 .4629 1.0000 N of Cases = 6.0
Item-total Statistics
Scale Scale Corrected
Mean Variance Item- Squared Alpha if Item if Item Total Multiple if Item Deleted Deleted Correlation Correlation Deleted
ITEM_1 13.0000 6.4000 .5251 .6471 .8472 ITEM_2 13.1667 5.3667 .6757 .7500 .8116 ITEM_3 12.3333 5.4667 .8333 .8588 .7642 ITEM_4 13.5000 6.7000 .7481 .7857 .8093 ITEM_5 12.6667 5.8667 .5922 .7143 .8333
Reliability Coefficients 5 items
Alpha = .8457 Standardized item alpha = .8609 紙筆計算結果
Question Joe Sam Sue Peg Gil Dot σi2 =
1 3 4 2 4 3 3 2 4 3 3 4 2 2 3 4 4 3 5 4 3 4 3 3 2 3 3 2 5 5 3 3 4 3 3 Total Score 19 17 13 20 15 13
.4722 .6667 .4722 .2222 .5833
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豆子編製 4/14/2013
X =16.1667, σ2=7.4722 σ=2.7335 k=5 N=6
??(1?
54.4722?.6667?.4722?.2222?.58332.4166)?(1.25)(1?)?(1.25)(1?.3234)?.84575?.857.47227.4722【伍】 KR20
有6題的隨測驗施測5名學生，Y表示答對，N表示答錯，以下是施測結果，請計算信度。 Question A B C D 1 Y Y Y N 2 Y N N Y 3 Y N N N 4 Y Y Y N 5 N N N N 6 Y Y N N 步驟一 轉換資料Y正確為1，N不正確為0 步驟二 與題四求內部ㄧ致性的步驟相同 Reliability
****** Method 2 (covariance matrix) will be used for this analysis ****** R E L I A B I L I T Y A N A L Y S I S - S C A L E (A L P H A)
Correlation Matrix
ITEM_1 ITEM_2 ITEM_3 ITEM_4 ITEM_5 ITEM_6
1.0000 -.6667 .4082 1.0000 -.6124 .1667 ITEM_1
1.0000 .4082 -.6667 .4082 .1667 ITEM_2
1.0000 .4082 -.2500 .4082 ITEM_3
1.0000 -.6124 .1667 ITEM_4
1.0000 .4082 ITEM_5
1.0000 ITEM_6
* * * Warning * * * Determinant of matrix is close to zero: 8.426E-36 Statistics based on inverse matrix for scale ALPHA are meaningless and printed as . N of Cases = 5.0
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豆子編製 4/14/2013
Item-total Statistics
Scale Scale Corrected
Mean Variance Item- Squared Alpha if Item if Item Total Multiple if Item Deleted Deleted Correlation Correlation Deleted
ITEM_1 2.2000 1.7000 .1400 . .2941 ITEM_2 2.2000 2.2000 -.1846 . .5114 ITEM_3 2.6000 1.3000 .6864 . -.0962 ITEM_4 2.2000 1.7000 .1400 . .2941 ITEM_5 2.6000 2.3000 -.2212 . .4891 ITEM_6 2.2000 1.2000 .5833 . -.1042
R E L I A B I L I T Y A N A L Y S I S - S C A L E (A L P H A)
Reliability Coefficients 6 items
Alpha = .3273 Standardized item alpha = .3307
紙筆計算結果
Question A B C D E Pi qi (p)(q)
1 Y Y Y N N .6 .4 .24
2 Y N N Y Y 3 Y N N N N 4 Y Y Y N N 5 N N N N Y .2 .8 .16
6 Y Y N N Y .6 .4 .24
Total Score 5 3 2 1 3
.6 .2 .6 .4 .8 .4 .24 .16 .24
X=2.8, σ2=1.76 σ=1.3266 k=6 N=5 KR?20?6(1.76)?(1.28.48()?(1.2)()?(1.2)(.2727)?.3273?.33 51.761.76 21
运用SPSS进行信度分析
