Testing differences in relative growth rate: A method avoiding curve fitting and pairing

Physiologia Plantarum - Tập 67 Số 2 - Trang 223-226 - 1986
Hendrik Poorter1,2, Charles Lewis3
1Dept of Plant Physiology, Univ. of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands
2H. Poorter (present address and reprint requests), Dept of Plant Ecology, Univ. of Utrecht, Lange Nieuwstraat 106, 3512 PN Utrecht, The Netherlands
3Dept of Statistics and Measurement Theory (Social Sciences), Univ. of Groningen, Oude Boteringestraat 23, 9712 GC Groningen, The Netherlands.

Tóm tắt

A method is discussed to test differences in relative growth rates. This method is based on an analysis of variance, with In‐transformed plant weight as dependent variable. A significant Group × Time interaction indicates differences in relative growth rates between groups. The advantages over the “classical” and “functional” growth analyses are: (1) No pairing procedure is required. (2) More than two groups may be evaluated in one analysis. (3) No decision is required about the polynomial used to fit the data. (4) By partitioning the interaction effect using orthogonal polynomials insight is gained into the nature of differences in relative growth rate. (5) By concentrating attention on the lower order terms of the polynomials, the influence of extraneous variation on conclusions may be minimized.

Từ khóa


Tài liệu tham khảo

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Thông tin
Thông tin xuất bản

Physiologia Plantarum

Tập 67 Số 2

223-226

Thông tin tác giả