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The copyright of a submitted article is only transferred to the publishers if and when the article is accepted for publication. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, electrostatic, mechanical, photocopying, recording or otherwise without the prior written permission of the publishers.
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Application of covariance analysis to feed/ ration experimental data
Abstract
The use Analysis of Covariance (ANOCOVA) to feed/ration experimental data for birds was examined. Correlation and Regression analyses were used to adjust for the covariate – initial weight of the experimental birds. The Fisher's F statistic for the straight forward Analysis of Variance (ANOVA) showed significant differences among the rations. With the ANOVA, the calculated F statistic was 4.025, with a probability of 0.0149. On the other hand the F calculated using the ANOCOVA was 2.25 with a probability greater than 0.05. This was not significant (as f0.05 = 2.93). This means that by using ANOVA, the calculated F will be over estimated and a researcher may arrive at a false conclusion indicating that there were treatment differences when actually there may be none.
Keywords: analysis of covariance, analysis of variance, regression and correlation, f-statistic, probability
Journal of Science and Technology Vol. 26(1) 2006: 54-59
Keywords: analysis of covariance, analysis of variance, regression and correlation, f-statistic, probability
Journal of Science and Technology Vol. 26(1) 2006: 54-59
