Questions tagged [ranks]

Ranks are ordinal numbers of the quantitative data values sorted ascendingly or descendingly. Various methods to assign ranks to equal values (ties) exist. Transform of values to ranks is often done in nonparametric data analysis. (Not to confuse with [ranking] task..) (See related: [order-statistics])

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1answer
8k views

ANOVA on ranks vs. Mann-Whitney U test

What exactly is the difference between performing a t-test on data that has been ranked and performing a Mann-Whitney U test on the unranked data? I keep reading things like: For example, the ...
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771 views

Rank data from 1 to N (N may not be equal to number of elements in the dataset)

I calculate percentile ranks based on the method at http://www.psychstat.missouristate.edu/introbook/sbk14m.htm I need to assign ranks to a dataset where ranks are ...
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2k views

Combining and ranking standard deviations

I am trying to take three independent indicators and combine them into a single composite measure. For discussion, let's say that this is a composite measure for 'economic performance', and that the ...
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1answer
168 views

best approach to compare ranks over time

If I have the following dataset: ...
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1answer
325 views

How to rank film production companies based on weighted ranks?

IMDB uses a Bayesian estimate to compute its top 250 films. Let's say I know all the variables needed to compute this Bayesian estimate for these films. I also have the production company associated ...
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1answer
1k views

Percentile Ranks in Matlab

I have 2 vectors of raw values. I need to do a percentile rank correlation and an ordinal rank correlation between them in Matlab. ...
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1answer
334 views

Wilcoxon signed rank statistic

It seems there are two formulas to perform a wilcoxon signed rank test - one where the sum of all the signed ranks is w and another where the minimum of the sum of the negative ranks and positive ...
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1answer
29k views

How does ties.method argument of R's rank function work?

I am using rank(a, ties.method="max") to rank a. But I am not quite sure what does ties.method="max" do. Can you please help?
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Structural shifts

I am using the R programming language to analyze the cointegration of 5 data sets. I have determined that the series share 3 cointegrating vectors after taking structural shifts into account following ...
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0answers
552 views

How to compute composite score of rank order variables?

I have several rank order items about the use of languages in different contexts. Specifically, respondents were asked to order three languages from most to least used in situations such as at work, ...
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1answer
3k views

Rank transformed 2-way ANOVA

I know I'm asking a lot of questions these days! Sorry about that, but I'm trying to work through my grad thesis data collected over the last 4 years, and am repeatedly tripping on my beginner's grasp ...
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2answers
3k views

Why is the Mann–Whitney U test significant when the medians are equal?

I've received a results from a Mann-Whitney rank test that I don't understand. The median of the 2 populations is identical (6.9). The uppper and lower quantiles of each population are: 6.64 & 7....
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2answers
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What correlation coefficient and graph is appropriate with this data?

I'm not in Statistics field. I conducted the case study and collected the data as shown below I have data as shown in the table below: I would like to find correlation coefficient from this two table ...
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4answers
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What is tied data in the context of a rank correlation coefficient?

I am not in statistics field. I have seen the word "tied data" while reading about Rank Correlation Coefficients. What is tied data? What is an example of tied data?
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1answer
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Compare rank orders of population members across different variables

I have some data which describe residential units for people with learning disability, variables like how nice the furnishings are, the level of psychiatric symptomology on the unit, how happy the ...

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