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14 views

Lsmeans: Is this what I did?

after doing the linear mixed model with lme4, I have used lsmeans for pairwise comparison with this command: lsmeans(lmer52, pairwise~color, adjust="tukey") I am ...
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1answer
25 views

Paired or unpaired Wilcoxon test?

I counted the number of geese on an intertidal mudflat on 100+ days over the winter. I made two counts on each of these days: one at low tide and one at high tide. I want to know if the number of ...
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1answer
16 views

Test to compare an effect on a variable on a daily basis

I would like to know the effect of an external factor on the number of visits on a website during a period of 4 weeks (only search visits from Google). For this, I measured the number of visits every ...
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0answers
25 views

Is pairwise wilcoxon test a valid non-parametric alternative to Tukey's HSD test?

I am trying to identify significant differences between groups from normal and non-normal distributions. When the distribution is normal the workflow is pretty straightforward: ANOVA and after that a ...
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1answer
35 views

Difference between the Wilcoxon Rank Sum Test and the Wilcoxon Signed Rank Test using paired observations

I was wondering what the theoretical difference is between the Wilcoxon Rank-Sum Test and the Wilcoxon Signed-Rank Test using paired observations. I know that the Wilcoxon Rank-Sum Test allows for ...
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0answers
33 views

What statistical tests can be used on a distribution of distributions?

I have two experimental conditions, each with 20 reps (40 experiments total). In all 40 experiments a non-fixed number of sounds were recorded, and I've measured each of their durations. I would now ...
5
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1answer
69 views

What is an “Unpaired Bland-Altman plot”?

I found this quote: Unpaired Bland-Altman plots were used to check systematic or bias errors in the SPECT myocardial uptake coefficients with respect to the reference standard PET data. ...
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0answers
14 views

Analyzing non-reciprocal pairs

What would be the best way to analyze the following data in a repeated measures type of experiment? I have a pairs of data describing a relation $a \rightarrow b$ and $a \leftarrow b$. These values ...
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0answers
13 views

Using BTL2 : Can we fix the scale of the ability-scores?

Using the Bradley Terry Luce 2 model: We want to rank 41 scripts by paired-comparison (package BTL2). But our dataset is incomplete. We can generate ability scores, but the scores at the end of the ...
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0answers
41 views

How to calculate ratings/rankings from Paired comparison / Pairwise comparison of large data-sets?

As part of my graduate thesis (area: psychology) I have gathered preference data. The data includes approximately 50000 heads-up comparison between elementX and elementX. I have a total of 15 ...
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1answer
63 views

Comparing two measurement devices without a criterion measurement

I am comparing energy expenditure outputs from two devices that track physical activity in a free-living setting over 10 days. Doubly labeled water is the accepted criterion measurement for this, but ...
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0answers
15 views

Using orthoginal comparison for non parametric data

Can I use an orthoginal comparison with non parametric data? What about using a post hoc test with my non parametric data? I am counting the number of objects within a nucleus and based on my ...
0
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0answers
64 views

Repeated measures one way ANOVA inconsistent with paired t- test result?

I have a repeated measures one way ANOVA with a significant interaction, but no significant main effects. I ran a paired samples t-test to further my analysis and found a significant difference ...
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1answer
167 views

Comparing (and testing) two discrete distributions with different magnitudes

I am comparing authoritative survey data (large amount of observations) with data gained from a social network (very small amount of observations). Particularly, I want to compare population per ...
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0answers
264 views

Comparing frequency distributions using Mann-Whitney test

I have two frequency distributions; which each are frequency of an event. I would like to compare these distributions, and conclude that these events and conclude if these events are statistically 1 ...
0
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0answers
13 views

Repeated Measures of Dependent Randomized Conditions

I'm designing an experiment to evaluate how learnable a software tool is. The basic setup is to have $n$ subjects perform $m$ tasks in a random order, and then test whether the subjects performed ...
1
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1answer
98 views

Reporting operative effect in paired t test

I just want to make sure I have something clear in my head. When I calculate the effect size for a paired samples t-test after obtaining a significant result, I simply take the mean of the differences ...
0
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3answers
432 views

Paired t-test for binary data

I have one sample with n=170 and two binary variables (A,B) that can take as a value 1 or 0, where 1 counts as a success and 0 counts as a failure. What I want to know is whether the means of these ...
2
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1answer
79 views

Why do zero differences not enter computation in the Wilcoxon signed ranked test?

The Wilcoxon signed ranked test tells us if the median difference between paired data can be zero. The test is executed by computing a statistic, then a z-score and comparing it to a critical value. ...
5
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1answer
221 views

Relative efficiency of Wilcoxon signed rank in small samples

I have seen in published literature (and posted on here) that the asymptotic relative efficiency of the Wilcoxon signed rank test is at least 0.864 when compared to the t test. I have also heard that ...
1
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1answer
150 views

When can we look at the significance of pairwise comparisons rather than an interaction term?

I will defend my Master's thesis on Thursday, and I have a doubt about an analysis that I have to present. In my experiment, I had two independent variables: Age category (SU = senior unemployed ...
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1answer
168 views

Non-parametric paired analysis of variance with unequal data

I have tried to search, but couldn't find an answer for my problem. I have data from different subjects that are exposed to different conditions. But they are exposed to the different conditions ...
3
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3answers
301 views

Can you do a paired t test in SPSS or GraphPad with only means, errors and N?

I have to verify some results. I have only the mean and its st. error, not the raw data. In a research paper they did a paired t test. Is it possible to check whether their p value is right by only ...
2
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1answer
70 views

Comparing two lists to measure for similarity

The problem I am trying to solve is finding the probability that two people are the same by cross-referencing the associates of the two people. For example, if person A is associated with the ...
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2answers
41 views

Non-parametric tests to compare numeric profiles

I am trying to compare two different numerical profiles and determine whether they are the same or not, computing a p-value. These profiles are composed of 200 values each (each of which corresponds ...
3
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2answers
675 views

Simple and paired t-tests and the control for multiple comparisons

Let's say that I have a group of subjects that were measured in two conditions (A and B) and I want to check three hypotheses: i) do data from A and B differ from each other?, ii) do data from A ...
15
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5answers
1k views

How to display error bars for cross-over (paired) experiments

The following scenario has become the Most-FAQ in the trio of investigator (I), reviewer/editor (R, not related to CRAN) and me (M) as plot creator. We can assume that (R) is the typical medical big ...
1
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1answer
66 views

Using regression for pairwise choice

I have pairs of objects, in which one is real and one is an artifact, and I need to choose the real one. Call them $G_\text{real}$ and $G_\text{fake}$. I compute a score for each object, and choose ...
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0answers
33 views

Comparing Multiple Measures of the Same Quantity

I have a program that samples a large number of 'possibilities' (i.e. choices of components for some vector $[a_1, a_2, \ldots, a_N]$), that can each be fed into a collection of different functions ...
2
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0answers
211 views

How do I analyse a two-alternative forced choice test?

I have recently as part of my bachelor project at my university conducted a two-alternative forced choice test. I have looked at ways to say something with significance about which images (the test ...
2
votes
1answer
129 views

Comparing two data sets for similarity with variable data quality

I have to compare two data sets for similarity. I'm designing a piece of software which will help improve a drummers accuracy. The software displays a rhythm which the drummer then attempts to play. ...
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0answers
65 views

Measuring spatial overlap in 2 different ways - paired t-test?

I have collected spatial data (GPS points and foraging heights) for a bunch of territorial animals. Until recently, these types of data were only analyzed in two dimensions (2D). However, 3D analysis ...
0
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0answers
66 views

method and needed tests for assumption in analyzing a paired sample Likert measure?

I am writing an exploratory paper considering an argument that a certain reaction that can arise in the viewing of art can serve as an empirical indicator that another particular cognitive process has ...
0
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1answer
262 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 ...
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2answers
294 views

How can I predict the odds that a dodgeball team is going to win based on the winning history of its players?

Imagine there are 80 dodgeball players in the world. Each of them has played thousands of dodgeball games with the other 79 players in more-or-less random order. This is a world without teams (e.g., ...
0
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1answer
105 views

Paired Samples T Test Suitability

I have data for 110 companies re. the price they have paid for a service annually between 2004 and 2011. Now I would like to find out if there is a statistically significant difference between the ...
5
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3answers
221 views

Matched binomial pairs

I am trying to analyse the following table: 5 5 5 5 4 5 5 5 5 3 4 3 3 4 4 3 5 5 Each number is a success score out of 5 attempts, so we can assume binomial (p, 5), for unknown p. ...
5
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1answer
130 views

Optimizing matching of players in a tournament round

I am an organizer for a board game tournament. All of our players have an internal Trueskill rating we calculate to assist us with matching opponents for each round of the tournament. For each round, ...
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0answers
2k views

Pre-test, post-test multiple comparisons

This feels like it should be a very straightforward stats analysis but I'm struggling to find a solution. I have a data set made up of pre- and post-test continuous data values taken from multiple ...
2
votes
1answer
591 views

Multiple paired samples t-tests?

I'm trying to determine the effect of taking a training course on various aspects of being a good quality worker. I have pre-test and post-test data on 7 different ways job performance can be viewed. ...
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1answer
329 views

Confidence intervals and pairwise comparisons

Let us say I have the following pair wise test data: ...
1
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3answers
345 views

Once again: paired versus unpaired t-tests

This is much the same question that I asked a few weeks ago, but I hope to explain myself more clearly this time. I start with 40 mice. I use my own scheme, based on my own ideas for how to make the ...
4
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0answers
53 views

Comparing performance after CV over a single dataset : does it violate the independence assumption?

Cross validation lets us get multiple estimates of the generalization performance of an algorithm when the performance cannot be estimated for each example independently. (As with an F1-score, we ...
2
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1answer
399 views

How to set up data for Bradley-Terry model in R?

I am trying to use the package BradleyTerry2 in R to assess sports teams. I am using the paper "Bradley-Terry Models in R: The BradleyTerry2 Package" written by Turner and Firth to guide me. I have ...
3
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0answers
334 views

What are the possible multiple comparison methods for paired data?

I have been working with simulations, among them scheduling simulations. Each simulation chooses the number of steps, the arrival rate of new jobs and the duration of each step for each job. Thus, ...
4
votes
1answer
947 views

How to fit Bradley–Terry–Luce model in R, without complicated formula?

The Bradley–Terry–Luce(BTL) model states that $p_{ji} = logit^{-1}(\delta_j - \delta_i)$, where $p_{ij}$ is the probability that object $j$ is judged to be "better", heavier, etc, than object $i$, ...
2
votes
1answer
596 views

Why does a paired t-test (when appropriate) result in better variance?

I didn't quite get the Wikipedia explanation here: http://en.wikipedia.org/wiki/Paired_difference_test#Use_in_reducing_variance I agree that both the unpaired and paired means are the same...then I ...
6
votes
1answer
199 views

Multinomial choice with binary observations

Is there a standard name for a multinomial choice model where the observations are in the form of binary questions such as "do you prefer A to B" and "do you prefer B to D"? This seems like a common ...