A method of evaluating trend (positive or negative) in 2 x K ordered t
ables is suggested for cases in which the scores for the first (K - 1)
categories are known a priori but the score for the last category is
not known. Such a category is termed as open-ended category in this pa
per. Ordered tables with an open-ended category are often encountered
while evaluating the Cochran-Armitage-Mantel (CAM) trend. In the prese
nt paper, the distribution of the test statistic is presented and simu
lations are carried out to check the asymptotics. The method is then e
xemplified by an existing data set.