In many testing situations the use of parallel forms or test-retest reliability coefficients is impractical. Viable alternatives to these approaches are the internal consistency coefficients. One of the most commonly used internal consistency coefficients is Cronbach s coefficient alpha. The purpose of this paper is to discuss the robustness of coefficient alpha. To begin, I will provide a deri...

This study aimed to investigate how Agency for the Development of Educational Management (ADEM) in-service training program enhances communication skills human relations Public Secondary school heads in Tarime District, Tanzania. The was guided by one research question. Convergent design under mixed approach used. targeted used a sample 8 schools, with 80 teachers, 16 non teaching staff and 192...

Reliability is the quantification of the consistency of results from a measurement procedure across replications. By far, Guttman’s Lambda 3 or coefficient alpha, as a lower bound to the reliability, is the most frequently used and reported index of reliability because of its simplicity in computation and accessibility in statistical programs. However, coefficient alpha tends to be negatively b...

Usability Studien über unterstützende technische Komponenten im Gesundheitswesen sind bislang die Ausnahme. Insbesondere mobilen Werkzeugen wurde bisher wenig Beachtung geschenkt, was auf den geringen Routineeinsatz dieser Geräte zurück zu führen ist. In der vorliegenden Arbeit werden erstmals Ergebnisse aus einer multizentrischen, externen Evaluation zur Benutzerfreundlichkeit von Handheld Ger...

We show how to test hypotheses for coefficient alpha in three different situations: (1) hypothesis tests of whether coefficient alpha equals a prespecified value, (2) hypothesis tests involving two statistically independent sample alphas as may arise when testing the equality of coefficient alpha across groups, and (3) hypothesis tests involving two statistically dependent sample alphas as may ...

In this paper fading correlation of α-μ distribution considering multi-antenna receiver is discussed. Diversity combining techniques are briefly outlined. Correlation coefficient and joint probability density function for alpha-mu fading is shown. Generalized correlation coefficient for two alpha-mu fading variates is defined. Simulation results of outage and Bit Error Rate (BER) for different ...