A Power Comparison of the Welch-James and Improved General Approximation Tests in the Split-Plot Design

1998 ◽  
Vol 23 (2) ◽  
pp. 152-169 ◽  
Author(s):  
James Algina ◽  
H.J. Keselman
Keyword(s):  
Trial Interaction ◽  
Multivariate Normal ◽  
Power Comparison ◽  
Test Power ◽  
General Approximation ◽  
Main Effect ◽  
Split Plot ◽  
Within Subjects ◽  
Plot Design

Power for the improved general approximation (IGA) and Welch-James (WJ) tests of the within-subjects (trials) main effect and the within-subjects × between-subjects (groups × trial) interaction was estimated for a design with one between- and one within-subjects factor. The distribution of the data had two levels: multivariate normal and multivariate lognormal Power estimates for conditions in which there were between-groups differences in dispersion matrices showed that, for both effects, there were conditions in which the IGA test was more powerful and conditions in which the WJ test was more powerful. The power advantage for the IGA test tended to be fairly small, whereas the power advantage for the WJ test was quite large in many conditions. Furthermore, the number of conditions favoring the WJ test was much larger than the number of conditions favoring the IGA test. Power for IGA, WJ, ε̃-adjusted, and MANOVA tests was compared for conditions in which dispersion matrices were equal across groups. Results indicate that little if any power was sacrificed by using WJ or IGA tests in place of MANOVA or ε̃-adjusted tests.

Split-Plot Designs with Correlated Proportions

1988 ◽  
Vol 62 (3) ◽  
pp. 915-921
Author(s):  
Gilbert Becker
Keyword(s):  
Contingency Tables ◽  
Higher Dimensional ◽  
Main Effect ◽  
Split Plot ◽  
Chi Squared ◽  
Within Subjects ◽  
Mcnemar’S Test ◽  
The One ◽  
Mcnemar's Test

An extension of McNemar's test for correlated proportions was presented in which subjects falling into McNemar's A and D categories are nested under two or more levels of one or more between-subjects factors. The main effect for the within-subjects factor is tested with the McNemar chi-squared statistic used for correlated proportions after collapsing the one or more between-subjects factors. Two- and higher-way interactions between the one or more between-subjects factors and the correlated proportions factor are tested with the Pearson chi-squared statistic used for two- and higher-dimensional contingency tables, respectively, based on observations taken from independent samples.

Respon Pertumbuhan dan Produksi Kacang Tanah (Arachis hypogaea L.) terhadap Sistem Tanam Alur dan Pemberian Jenis Pupuk

2017 ◽  
Vol 5 (3) ◽  
pp. 342
Author(s):  
Rizal Mahdi Kurniawan ◽  
Heni Purnamawati ◽  
Yudiwanti Wahyu E. K
Keyword(s):  
Arachis Hypogaea ◽  
Arachis Hypogaea L ◽  
Split Plot ◽  
Plot Design

<p><em>Penelitian ini bertujuan untuk mempelajari pengaruh sistem tanam alur dan pemberian jenis pupuk terhadap pertumbuhan dan produksi kacang tanah (Arachis hypogaea L.). Penelitian dilaksanakan di KP Leuwikopo IPB Dramaga, Bogor pada bulan Februari - Juni 2013. Percobaan menggunakan rancangan petak terbagi (Split Plot Design) dengan perlakuan terdiri dari dua faktor, yaitu sistem tanam alur sebagai petak utama dan jenis pupuk sebagai anak petak. Hasil penelitian menunjukkan bahwa perlakuan sistem tanam alur meningkatkan daya hasil pada produktivitas biji kering, produktivitas polong kering, dan bobot kering biji per tanaman lebih baik dibandingkan sistem tanam konvensional. Hal tersebut ditunjukkan dengan perlakuan sistem tanam alur yang memiliki produktivitas 2.93 ton/ha polong kering, sedangkan sistem tanam konvensional sebesar 2.55 ton/ha polong kering. Sistem budidaya kacang tanah pada sistem tanam alur dapat meningkatkan efisiensi tanaman dalam memanfaatkan unsur hara yang telah diberikan baik pupuk organik maupun anorganik, sehingga pertumbuhan dan hasil tanaman kacang tanah menjadi lebih baik. Pemberian jenis pupuk kandang ayam + Dolomit + NPK memberikan respon terhadap pertumbuhan dan  daya hasil rata-rata tanaman yang lebih baik dibandingkan jenis pupuk lainnya.</em></p>

scholarly journals Performance of hybrid rice grown from separated tillers

2019 ◽  
Vol 17 (4) ◽  
pp. 507-513
Author(s):  
FN Kamarum Munira ◽  
Md. Parvez Anwar ◽  
Sabina Yeasmin ◽  
Md. Harun Or Rashid ◽  
Mst Farzana Rahman ◽  
...  
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Hybrid Rice ◽  
Rice Variety ◽  
Field Laboratory ◽  
Split Plot ◽  
Rice Seeds ◽  
Four Levels ◽  
Plot Design

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to November 2016 to investigate the performance of separated tillers of hybrid rice variety Dhani Gold. The experiment comprised three times of tiller transplantation viz. 3, 4 and 5 week aged tiller seedlings and four levels of number of tiller seedlings transplanted hill-1 viz. 2, 3, 4 and 5 tiller seedlings hill-1 laid out in a split plot design with 3 replications. The highest plant height was obtained when 3-week aged tiller seedlings were transplanted at the rate of 3 tiller seedlings hill-1. The highest number of total tillers hill-1 and number of effective tillers hill-1 were found when 3-week aged tiller seedlings were transplanted with 5 tiller seedlings hill-1. The highest grains panicle-1 was obtained when 4-week aged tiller seedlings were transplanted with 5 tiller seedlings hill-1. The highest grain yield was found when 3-week aged tiller seedlings were transplanted with 5 tiller seedlings hill-1. The lowest grain yield was found when 5-week aged tiller seedlings were transplanted with 2 tiller seedlings hill-1 in hybrid rice variety Dhani Gold. Based on the findings of the present study it may be concluded that 3-week old tiller seedlings of Dhani Gold should be transplanted at the rate of 4 or 5 tiller seedlings hill-1 for higher yield. Thus present study confirms the potentiality of growing hybrid rice from separated tillers in case of unavailability of seedlings or to minimize the seed cost of high value hybrid rice seeds. J Bangladesh Agril Univ 17(4): 507–513, 2019

Yield and Yield Contributing Attributes Of Potato as Influenced by Vermicompost And Seed Tuber Size

2021 ◽  
Vol 19 (1) ◽  
pp. 71-79
Author(s):  
M Mostofa ◽  
TS Roy ◽  
R Chakraborty
Keyword(s):  
Seed Tuber ◽  
Maximum Yield ◽  
Potato Production ◽  
Tuber Size ◽  
Factor B ◽  
Yield Parameters ◽  
Study Results ◽  
Split Plot ◽  
Two Factors ◽  
Plot Design

Low yield is crucial bottleneck for potato production in Bangladesh. The application of vermicompost may enhance the yield of potato. The experiment was consisted of two factors, i.e., Factor A: - Vermicompost level (Vm1-4): Vm1: 0 t ha-1, Vm2: 3 t ha-1, Vm3: 6 t ha-1 and Vm4: 9 t ha-1; Factor B:- Tuber size (T1-5): T1: 5-10 g, T2: 10-20 g, T3: 20-30 g, T4: 30-40 g and T5: > 40 g. The experiment was conducted in a split-plot design with three replications. Vermicompost had significant effect on most of the yield contributing parameters investigated under present study. Results revealed that yield parameters increased with increasing vermicompost level irrespective of tuber size. Among the twenty (20) treatment combinations, vermicompost at the rate of 9 t ha-1 with tuber size > 40 g produced the maximum yield (31.33 t ha-1) that was 53.53 % higher than that of control with 3273.01 $ of monetary advantage. Therefore, present study suggests that potato growers may use vermicompost for increasing yield of potato in Bangladesh. SAARC J. Agric., 19(1): 71-79 (2021)

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