Stata's procedure offers an interesting possibility to compute the scale immediately from your data. Alpha is a very nice command used to calculate Cronbach's alpha for scales. A “high” value for alpha does not imply that the measure is unidimensional. Các bạn nhấn vào menu Statistics > Multivariate analysis > Cronbach's alpha. Parisa, for dichotomous items the Kuder-Richardson Formula KR-20 is the correct formula. I know this is something that SPSS can do, but I am trying to find a way to include it in my stata output. Das Cronbachsche Alpha wird vor allem in den Sozialwissenschaften bzw. The Cronbach’s alpha value was 0.94 in this study. 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− 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. Fragen einer Skala miteinander in Beziehung stehen (interrelatedness).Es ist hingegen kein Maß für die Eindimensionalität einer Skala. Thực hành cách phân tích cronbach's alpha trên phần mềm Stata. The continuous variables (age, effort, reward and over-commitment), which obeyed a normal distribution, were described using means (and standard deviations). Cronbach's alpha if item deleted. 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. Then there are a few options which can be used to finetune the command. As such, removal of this item should be considered. I don't see it as an option in the alpha help menu. • Cronbach’s alpha for dichotomous items • Use alpha command in STATA, will automatically give KR20 when items are dichotomous. 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. 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. Most items appeared to be worthy of retention, resulting in a decrease in the alpha if 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. Ben Jann's alphawgt program "Cronbach's alpha for weighted data" (at SCC) takes aweights.For the weight, specify [aw = your_sampling_weight]. The one exception to this was item 4, which would increase the alpha to α = 0.83. 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. 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. Statistical analysis. Das Cronbach's Alpha beträgt hier 0.7. Cronbach’s alpha showed the questionnaire to reach acceptable reliability, α = 0.81. 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. Computing Cronbach's Alpha Using Stata. 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. Dies ist das Cronbach's Alpha, und somit der wichtigste Wert des Outputs. The basic syntax is simply alpha [variables in the scale] and requires at least two items. Cronbach’s alpha is a measure of internal consistency, that is, how closely related a set of items are as a group. It is considered to be a measure of scale reliability.