In sample size calculations, where do we use absolute and relative precision? Is relative precision indicated where the population size is finite and known to us and vice versa?
Yamane (1967) Formula is best
I would also propose to check Eng (2003) for sample size estimation.
I have an ordinal regression model and I would like to depict the proportional odds graphically. Can somebody please help me regarding the best software to do it? Can I do it with jmp?
01 February 2019 2,859 3 View
We have prepared a scatter plot with two continuous variables using Graphboard Template Chooser in SPSS. We have tried to arrange the size of dots and add data labels. However, we cannot add the...
05 June 2018 3,128 3 View
I am analyzing a data set in which the outcome variable is with count data with large variance, the maximum of which is 84751821 and the minimum is 1. The predictor variables are continuous in...
02 March 2018 4,911 3 View
I have a dataset with an ordinal outcome variable (3 categories) and a few inary predictor variables. I have run the ologit command in STATA and in response got coefficients and p value for each...
09 October 2017 2,883 3 View
I have a SPSS dataset in which I detected some significant outliers. The outliers were detected by boxplot and 5% trimmed mean. How do I deal with these outliers before doing linear regression?...
07 August 2017 4,697 7 View
04 May 2017 8,221 4 View
02 March 2017 5,846 4 View
Both studies start with a control group and try to find out the association between cause and effect. So where does the difference lie?
31 December 2016 9,407 3 View
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31 December 2016 8,539 0 View
We are planning to study the suicidal intent among suicide survivors in a tertiary care hospital. We are planning to use Beck's suicide intent scale. My question is, are there any other scales...
11 December 2016 6,935 4 View
Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...
01 March 2021 2,215 2 View
01 March 2021 3,905 5 View
I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...
01 March 2021 1,587 6 View
Pls share your thoughts
01 March 2021 7,330 4 View
Hi, I am trying to learn the theoretical modelling of silver nanoparticle using the Mie scattering theory. After that, I discovered a software named Mieplot developed by Philip Laven, where it...
25 February 2021 7,493 6 View
I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...
24 February 2021 3,823 2 View
I'm in the process of updating a meta-analysis and in one of the new studies, effect sizes are reported as Tau-U. Two of the effect sizes are reported as Tau-U = 1.00. I am using Andy Field's...
24 February 2021 2,265 3 View
How do I run a a priori sample size determination for non-parametric tests, like the Mann-Whitney U-test and the Kruskall-Wallis or other non-parametric tests that accord with the unpaired t-test...
24 February 2021 166 6 View
I need to conduct a a priori sample size determinations for t-test with unequal means, but I don't know the sizes of the groups nor the ratio of both groups... Can I do a sample size determination...
24 February 2021 8,289 3 View
My sample size is too small to conduct a factor analysis. I created my own psychometric scale for measuring Effectiveness of Support, which contains 38 items (4 sub-scales) Im really struggling...
23 February 2021 9,287 12 View