Abstract
<title>Abstract</title> This chapter deals with analysis of covariance or ANCOVA, a combination of ANOVA and regression. It tests the effects of a mix of continuous and categorical variables on a continuous response variable. Two examples are presented. Example 1 is based on a study investigating the effects of two types of tagging (acrylic paint and subcutaneous microtags) on the growth of the coral reef goby, <italic>Coryphopterus glaucofraenum</italic>, in the British Virgin Islands and included initial size as a continuous explanatory variable. Example 2 analyses data from a study on the number of pollinaria removed by pollinators from inflorescences of two <italic>Sirindhornia</italic> orchid species (<italic>S. monophylla</italic> and <italic>S. mirabillis</italic>) in relation to the number of flowers in the inflorescence (also count data) and the orchid species (categorical).
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