Statistical study of measurements of nematodes

Abstract

This thesis is a preliminary statistical study on two nematodes, Horsenettle Cyst and Osborne Cyst. Each of the two nematodes were collected from two hosts, Horsenettle weed and tobacco. For each of the four combinations 115 nemas were selected, and six measurements were taken from each nema.

A test of normality was made to investigate the normality of the distributions of the combinations. Two tests of Homogeneity of Variances were made for combinations which had been considered to be normally distributed. Analyses of Variances were made for the measurement combination which had satisfied the assumptions of normality and homogeneity of variances.

Nonparametric analyses of variance were made for the combinations which had been considered non-normally distributed or had unequal variance.

A discrimination function was estimated to discriminate between any two of the combinations based on the six measurements, and a test of significance for each discrimination function was made. The separation point between each two groups was determined, and the probability of misclassification was computed.