Thực hành cách phân tích cronbach's alpha trên phần mềm Stata. Giả sử thang đo ĐỘ TIN CẬY có 4 biến mã hóa là TINCAY1 TINCAY2 TINCAY3 TINCAY4, giờ ta cần tính độ tin cậy của thang đo này. Das Cronbach's Alpha beträgt hier 0.7. Das Cronbachsche Alpha wird vor allem in den Sozialwissenschaften bzw. Cronbach’s Alpha is a way to measure the internal consistency of a survey or questionnaire.. Cronbach’s Alpha ranges between 0 and 1, with higher values indicating that the survey or questionnaire is more reliable. Cronbach’s alpha is a measure of internal consistency, that is, how closely related a set of items are as a group. Da für das Cronbach's Alpha üblicherweise ein Wert von mindestens 0.7 gefordert wird, weist der hier untersuchte Fragebogen eine gerade ausreichende Reliabilität auf. Das Cronbachsche (Alpha) ist eine nach Lee Cronbach benannte Maßzahl für die interne Konsistenz einer Skala und bezeichnet das Ausmaß, in dem die Aufgaben bzw. As such, removal of this item should be considered. Ben Jann's alphawgt program "Cronbach's alpha for weighted data" (at SCC) takes aweights.For the weight, specify [aw = your_sampling_weight]. A “high” value for alpha does not imply that the measure is unidimensional. Then there are a few options which can be used to finetune the command. The continuous variables (age, effort, reward and over-commitment), which obeyed a normal distribution, were described using means (and standard deviations). Fragen einer Skala miteinander in Beziehung stehen (interrelatedness).Es ist hingegen kein Maß für die Eindimensionalität einer Skala. Cronbach's alpha if item deleted. Dies ist das Cronbach's Alpha, und somit der wichtigste Wert des Outputs. Most items appeared to be worthy of retention, resulting in a decrease in the alpha if deleted. practice, Cronbach’s alpha is a lower-bound estimate of reliability because heterogeneous test items would violate the assumptions of the tau-equivalent model.5 If the calculation of “standardised item alpha” in SPSS is higher than “Cronbach’s alpha”, a further examination of the tau-equivalent measurement in the data may be essential. Stata's procedure offers an interesting possibility to compute the scale immediately from your data. Statistical analysis. I know this is something that SPSS can do, but I am trying to find a way to include it in my stata output. It is considered to be a measure of scale reliability. Alpha is a very nice command used to calculate Cronbach's alpha for scales. Computing Cronbach's Alpha Using Stata. The one exception to this was item 4, which would increase the alpha to α = 0.83. Cronbach’s alpha showed the questionnaire to reach acceptable reliability, α = 0.81. • Cronbach’s alpha for dichotomous items • Use alpha command in STATA, will automatically give KR20 when items are dichotomous. I've tried a number of commands which take both aweights and pweights and compared the results; the estimates (though not standard errors) were always the same. The basic syntax is simply alpha [variables in the scale] and requires at least two items. Cronbach's alpha is a statistic frequently employed to indicate the reliability (or internal consistency) of a number of items that supposedly form a scale. I don't see it as an option in the alpha help menu. Các bạn nhấn vào menu Statistics > Multivariate analysis > Cronbach's alpha. The Cronbach’s alpha value was 0.94 in this study. Hi I am hoping someone more familiar with stata can help me with a cronbach's alpha code that includes the computed alpha if an item is deleted. To calculate Cronbach’s Alpha for a given survey or questionnaire, simply enter the responses for up to five questions into the boxes below, then press the “Calculate” button. Parisa, for dichotomous items the Kuder-Richardson Formula KR-20 is the correct formula. 1 2 20 1 1 K ii i total pq K KR K σ = "# $% =$%− − $% $%’(∑ p i = Proportion responding positively to item i qp ii =1−