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Eleven `Desirable' pecan trees with yield data for 22 to 47 years were selected from a database with data from three orchards. Cumulative yield were computed for each tree. Cumulative data was transformed using LOG10. Quadratic or cubic regression curves were fit for each tree and for all in a single analysis. In most cases, variances were not homogeneous among the 11 trees. Using the regression coefficients for each tree, an average of the five was made and appropriate standard errors were computed. Number of cases where homogeneity of variances were found increased. Younger trees benefiting from better orchard management had different variances than older trees moving across changing managements. LOG10-transformation tended to decrease variation, but variances were still heterogeneous.

COMBINING LONG-TERM PRODUCTION CURVES OF SEVERAL PECAN TREES OF SAME CULTIVAR WHEN SLOPE ESTIMATES ARE NOT EQUAL AND VARIANCES ARE HETEROGENEOUS