Browsing by Author "Thomas, E J"
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Item Analysis of variance when observations are subject to errors due to rounding off(Kerala Agricultural University, 1975) Thomas, E JItem Dispersion – A new approach(Kerala Agricultural University, 1982) Thomas, E JThe variance sj can be expressed in terms of the sum of squares of differences between all possible pairs of observations. This new approach to the definition of ss is useful in understanding many concepts in statistics and also provides simpler computational formulae. Implications of this new definition are studied in a number of situations.Item Estimation of leaf area in greengram (Phaseolus Aureus Roxb) using linear parameters(Kerala Agricultural University, 1978) Sreekumar, S O; Thomas, E J; Saraswathy, P; Mary K GeorgeItem Genetic variability and correlations in cowpea Vigna Sinensis (L) savi(Kerala Agricultural University, 1979) Sreekumar, S G; Ramachandran Nair, Y; Saraswthy, P; Mary K George; Thomas, E J43 different genotypes of cowpea were grown in a Randomized block design with 2 replications during Khariff 1978. The different genetic parameters viz. coefficient of Phenotypic and genotypic variation, heritability in broad sense and genetic advance were calculated. The study revealed that all the characters showed positive phenotypic and genotypic correlations with yield. High heritability and genetic advance were noticed for 100 grain weight, yield of grain and yield of haulms. This indicate that selection based on the above characters will be very effective for the improvement of the crop.Item Optimum plot size for field experiments with tapioca(Kerala Agricultural University, 1974) Prabhakaran, P V; Thomas, E JItem Path analysis in green gram (Phaseqlus Aureus Roxb.)(Kerala Agricultural University, 1979) Saraswathy, P; Sreekumar, S G; Thomas, E JItem Prediction of rainfall at Pattambi(Kerala Agricultural University, 1977) Thomas, E JBased on data relating to monthly and annual amounts of precipitation and also number of rainy days at Pattambi, point estimate 'namely arithmetic mean and interval estimates based on different levels of probability for the monthly well as annual amounts of rainfall and number of rainy days have been computed. These form the estimates for purposes of prediction during a normal year.Item Properties of the sample variance in samples from a generalised autoregressive scheme(Kerala Agricultural University, 1978) Thomas, E JAn attempt is made to study the properties of the sample variance in samples from a generalised autoregressive scheme, by computing the moments. Eventhough the expressions are lengthy, the moments can be derived. For the simple particular case xt = et -j- a.et , the moments have been worked out. The exact distribution has not been derived, but the large sample approximation is found to be normal with mean S2 (1 + a2) and variance (2/n) (a4 + 8a2 -f2).S4 When a ^ 0, s2 is a biased of S2.Item Relationship between plot size and plot variance(Kerala Agricultural University, 1974) Thomas, E JFifteen models have been considered for studying the plot variances in relation to plot size. The functions for variance of yield per plot V (y ), coefficient of variation of yield per plot C. V (yx) and the variance of yield per unit area VA have been derived. Estimation of optimum plot size, based °n five different criteria have been attempted in each of these situations.Item Stochastic models for the explanation of trend in production of rice in Kerala for the period 1957—1958 to 1971-1972(Kerala Agricultural University, 1975) Saraswathy, P; Thomas, E JFive different models were tried to explain the production of rice in terms of area (x), and period (0. The following results were obtained. A t yt = 946.2 x 1.022r with r = 0.80, y = 166.4 x 1 263* with i- = 0.84 A y ==287.9 x 1.172 X l.OOS1 with P ^ 0.84 A n O^RS^O t y{ := 925.47 . eU' with r = 0.64 and t A 0.032018 £ x. -0.231688 t with P = 0.66 yt = 925.47 . e 1 J The values of the coefficients of determination show that these models fit the data satisfactorily.Item Trends in production of certain agricultural crops in Kerala(Kerala Agricultural University, 1976) Saraswathi, P; Thomas, E JThe log-normal model is fitted to data on production of crops namely rice, tapioca, coconut, arecanut, pepper, tea, coffee, rubber and cashewnut in Kerala, for the period 1952-53 to 1973-74, except for tapioca for which data for the period 1963-64 to 1973-74 only have been utilised. It is found that the models give satisfactory fit to the data. Estimates of production for the period 1975-76 to 1977-78 have been obtained using these models.Item Usefulness of sensory methods of analysis by a taste panel in differentiating the quality of cassava tubers under different manurial treatments(Kerala Agricultural University, 1975) Prema, L; Thomas, E J; Aiyer, R SFive kg. of cooked tubers from 4 treatment combinations from the two extreme levels of nitrogen and phosphorus in a fertiliser experiment conducted at Vellayani with 3 levels of nitogen (N0 = 0, N,-=75 N, = 150 kg P3O,,/ha) and 3 levels ofP