Ranks are obtained when the sorted values in the data are replaced by their ranking.

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2
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32 views

Can I use proportion data and continous data for estimate of Spearman' s rho ? what if monotonic relatioship does not come out for a dataset ?

I want to use Spearman's rho test on proportional data for one variable and continuous data for the second variable (e.g. % survival of fish related to concentration of arsenic)? Further I want to ...
0
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0answers
25 views

How to compare three groups ranking a set of items?

I have six photos which the test subjects rank according to their preference. So the response per person is six columns, "Rank of photo A" to "Rank of photo F". I am grouping the subjects by ...
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0answers
6 views

Can residual deviance and AIC both decrease at the same time when the no of classes are reduced?

I have data on 148 websites' Global Ranks , Total Visits and Average Page views per visit. My objective is to model the Global Ranks on the basis of Total Visits and Average Page views. I have ...
3
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1answer
20 views

Calculate percentile from ranks

I am trying to come up with a formula to calculate my percentile finish in fantasy sports games while also learning some statistics along the way. Rather than trying to work with the complete list of ...
0
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1answer
58 views

How can I conduct a non-parametric version of MANCOVA in R?

Is it possible to transform my variables to their ranks and apply MANCOVA to the transformed data, just like how it is done in rank ANCOVA?
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1answer
43 views

Methodology to rank contributors

I have contributors who complete certain no of tasks in a day. I want to rank them. Below is the data. User 1 has been given 1 task and he completed it = 100% completion User 2 has been given 20 ...
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0answers
11 views

Can rank ordered mixed logit handle varying set sizes?

I have data that consist of numerous trials, where each trial is a ranked set of items. The set of items for each trial is a subset of varying size of all possible items. (I.e. the items are shared ...
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0answers
19 views

Inferring values based on rankings

I'm looking to infer items' values from only ranked lists of these items. I'm assuming that each item has some value, for which a higher value makes it more likely to appear first. This value can be ...
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1answer
61 views

Usefulness of Rank Tests

I know that rank tests are useful because we they are more or less performed without distribution assumptions of the unranked data; they are particular cases of permutation tests... But what are the ...
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0answers
23 views

Ranking volatility algorithm

I wanted to know if there were standard methods to solve the problem of comparing volatility in rankings over time of different datasets. For a concrete example, let's say I do a google search of ...
0
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1answer
61 views

How to rank data in R? [duplicate]

I'll use equality of variance test by Mann-Whitney rank sum test but I can't define order for data ...
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1answer
54 views

Difference between samples in terms of frequency ranks

I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013; Text A, letter B, freq = 1462,...). These texts have ...
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0answers
32 views

Statistical test for changes in ranks

I am investigating changes in rankings of schools. For example, in year t school X may have been in the 17th percentile (poor performer) but in year t+1 it may have improved to be in the 94th ...
2
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3answers
72 views

Is there a two-way Friedman's test?

I have ranked concentrations (from 0 to 5) of 5 different proteins from 3 different locations from the same patient. In total, 15 measures per patient and 61 patients, so 915 observations. What I'd ...
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1answer
45 views

Testing ranks rather than actual numbers with parameteric tests

An answer on this page Non parametric analysis states: "You can perform ANOVA using ranks of your variable instead of variable itself. This will lead to the same results with Kruskal-Wallis ...
4
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2answers
49 views

weight a rating system to favour more severe cases

I have a rating system which can take 5 possible outcomes, which are coded to: ...
1
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0answers
41 views

How to give ranking for two different variables?

I have two variables: one is "Due amount" and another one is "Overdue days". How to rank these variables? Few customers have big amounts but they will delay the payment by a few days only, so there ...
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1answer
113 views

Proving similarity between two rankings

We are seeking a comparison of two different rankings of the same 3 systems Background: We have conducted a test of 3 different systems. Participants experienced a system and rated it on a 7-point ...
2
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0answers
68 views

How to analyze ranks as responses?

A client has data where multiple subjects (people) have been presented with with four product alternatives, and after experiencing all four, were asked to rank the products. The data look like ...
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0answers
79 views

ranking based of number of items and value

How to avoid the issue of an item with a single 5-star rating getting a higher average rating than one with (99 5-star ratings and one 4-star rating). How to properly rank based on average star and ...
10
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1answer
3k views

Displaying Ordinal Data - Means, Medians, and Mean Ranks

I have some ordinal data that is not normally distributed, so I decided to do non-parametric testing using the Mann-Whitney U Test. I am looking at differences between groups for seven scores - these ...
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1answer
246 views

Mean and variance of ranks

Consider rank data 1 to n with two groups, n=n1+n2, how would one test the null that the two groups have equal rank distributions using MOMENTS? (Wilcoxon is not the answer) Is MLE possible to do the ...
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0answers
14 views

Variable selection multiple data types

I'm working on a data set containing 45 predictors that cover metric, ordinal and nominal variables. Aiming to finally build a model, which explains the interacting effect of a set of predictor ...
1
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1answer
57 views

What is a one-way ANOVA on the ranks of the observations

While reading this link: http://www.statsdirect.com/help/Default.htm#nonparametric_methods/kruskal_wallis.htm, I came across the following: ...
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0answers
99 views

Rank sums in the Kruskal-Wallis output

I use Stata to perform a Kruskal-Wallis test on four groups of data (not normally distributed), and the results are shown below: ...
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1answer
89 views

how to evaluate consistency of rankings for n columns

Suppose I have n columns in a matrix (example below has n= 4). Is there a test I can check that the rankings over columns are ...
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1answer
74 views

Relationship between nominal and ranked variables

I am practicing statistics on the gss dataset. I want to study the relationship between people owning guns in the USA and political inclination. Owning guns or not is a nominal variable while ...
2
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0answers
78 views

ANOVA on ranks?

Once in a statistics class I've seen the suggestion that one non-parametric approach for ANOVA would be to perform the ANOVA analysis on the ranks of the original data (basically as an alternative to ...
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0answers
22 views

Classification Residual Analysis with rank-based goal

I have a dataset consisting of users, each with a number of items (ranging from 1 to 100). The end-goal is for each user to be able to predict the ranking the of the items according to some other ...
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1answer
477 views

Which regression analysis should I use for ranked dependent variables and proportional independent variables?

I am analysing the effect of deprivation on breastfeeding and am wondering which type of regression analysis I should use. It is area level data. Deprivation data is available as a score from 0 - ...
6
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2answers
931 views

Why is a Pearson correlation of ranks valid despite normality assumption?

I am currently reading up on assumptions for Pearson correlations. An important assumption for the ensuing t-test seems to be that both variables come from normal distributions; if they don't, then ...
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0answers
22 views

Is a rank means stat appropriate?

I have attached an image of a subset of data consisting of snow measurements (D1-D6) taken at unique locations (Site1-Site25) over the course of several years. Each measurement was taken at the same ...
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0answers
44 views

Creating a model to interpret numerical scores

Good morning/afternoon everyone, first of all thanks to all of you for the valuable insights provided. I will be oulining here my current challenge, trying to provide as much detail as possible. ...
2
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0answers
51 views

Patterns in binary data sorted with rank indices

I have a sequence of binary data, each row of which has seemingly random bits and associated with an integer value ("rank"). When we have a binary datum, we always can calculate the rank related to it ...
0
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1answer
101 views

Spearman's Rho - from partial ranked variables

I have two variables which represent two performance measures. I ranked a finite set of elements according these two variables. Therefore, I have to ranks. Suppose the ranks are performed in ...
0
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1answer
57 views

How are ranks calculated in tie cases?

I am considering the following question: when there are ties, how are ranks calculated? In some references, they first rank them without repeating the ranks, and then average the ranks of those ties ...
2
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1answer
171 views

Equivalent to K-S test on discrete data with uneven quantization

I have some data resulting from a simulation that consists of several groups, each containing a single real datapoint and a variable number of matched controls. I take the rank of each real value ...
5
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1answer
237 views

Equivalence of Mann-Whitney U-test and t-test on ranks

What does it mean when people say that a t-test performed on ranked data is equivalent to a Mann-Whitney U-test? Does that mean they just test the same hypothesis/are useful in the same situations or ...
3
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1answer
3k 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 ...
2
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1answer
1k views

Which statistical tests can be used to compare two paired/related rankings?

To understand my question, can anyone to evaluate if the statistical analysis in the below research (from the 2011 year) was performed correctly? I must to analyze a similar research and I am ...
5
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0answers
964 views

Comparison of ranked lists

Suppose that two groups, comprising $n_1$ and $n_2$ each rank a set of 25 items from most to least important. What are the best ways to compare these rankings? Clearly, it is possible to do 25 ...
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1answer
344 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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0answers
218 views

Assumptions of Quade Rank-Based ANCOVA

Spelled out in plain English, what are the assumptions of the Quade (1967) rank-based ANCOVA procedure? It's not written very clearly in the paper. For instance, in regular ANCOVA, I believe the ...
5
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3answers
367 views

How to compare ranked data?

I have some questions about how to analyze ranked data. The data looks like this: 4 groups of people with HIV and 16 other groups of people living in the same village were asked to rank 12 ...
0
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1answer
405 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
97 views

best approach to compare ranks over time

If I have the following dataset: ...
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1answer
198 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
735 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. ...
5
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0answers
245 views

How to predict the probability of a performance rank for a test taker on a future test based on previous test scores?

Four students sit a series of tests, each test contains 10 questions. Students are ranked 1-4 in each test depending upon who got the most questions correct. ...
2
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1answer
209 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 ...