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3
votes
0answers
16 views

Report in ANCOVA: descriptive means or estimated marginal means?

I have conducted an analysis of covariance, ANCOVA, followed by Bonferroni post-hoc tests, on SPSS. I want to report the differences between my groups in text (APA style) and in a corresponding bar ...
0
votes
0answers
6 views

Is there a general structure for papers/documents explaining computer vision databases?

I recently created a database of images for testing a specific computer vision problem. Due to lack of data in the first place, I designed an algorithm which generates new images from the few existing ...
2
votes
1answer
37 views

Why would I want to bootstrap when computing an independent sample t-test? (how to justify, interpret, and report a bootstrapped t-test)

Let's say I have two conditions, and my sample size for the two conditions is extremely low. Let's say I only have 14 observations in the first condition and 11 in the other. I want to use the t-test ...
1
vote
1answer
31 views

How to report data when there is interaction

I did a multivariable logistic regression analysis to estimate the effect of an exposure (E) on an outcome while adjusting for confounders. I investigated interaction and discovered a significant ...
5
votes
2answers
104 views
+50

Reporting degrees of freedom for Welch t-test

The Welch t-test for unequal variances (also known as Welch–Satterthwaite or Welch-Aspin) generally has a non-integer degrees of freedom. How should these degrees of freedom be quoted when reporting ...
1
vote
0answers
12 views

Normality violations in multiple regression - report bootstrapped CIs, p values & t values?

I have analysed some data for a research project using multiple linear regression. However, normality assumptions for this method were not met in my data (and could not be resolved using ...
3
votes
2answers
214 views

From SAS to R - what are “must” packages for reporting

One big advantage of SAS over R is arguably its ability to produce quite complex reports with few statements; think of PROC SUMMARY or ...
0
votes
0answers
8 views

What information should be in a paper on the analysis of maintenance of fleet system

I need to write a conference paper on recent analysis of two data sets. One data set contains measurements of vehicle operating characteristics for a fleet of vehicles. The 2nd data set contains the ...
0
votes
0answers
17 views

Decriptive statistics for a large amount of times series

I have 1,000 individual company time series of a variable, say X, observed 500 times (weekly observations). I would like to describe how this variable behaves. A graphic presentation of each time ...
0
votes
0answers
25 views

Troubles reporting transformed variables for log and sqrt into a general equation

Good morning everybody, I see CrossValidated has really high level of questions and answer; I am just a student so I hope this question is not too basic... Suggestion of further readings available ...
0
votes
0answers
41 views

How do I report the result of an mcp-Tukey-test, i.e. how do I report it's z value?

After doing a model comparison with my mixed lmer model, I have a model with two main effects, no interaction, say signal ~ factor A + factor B + (1|subj). Factor ...
1
vote
0answers
45 views

Reporting Fixed Effects as (partial) correlations?

I'm doing a linear mixed effects analysis in which I'm really only interested in one of the fixed effects. I have several other fixed effects and a random intercept term, but none of them are ...
3
votes
1answer
84 views

Should you report variance of asymmetrical data, such as ratios?

I have measured the time taken to solve a problem by algorithm $X$ and by algorithm $Y$. It takes a quite long time, so I have only 10 data for each algorithm: $$ X : ( x_1, x_2, \dots , x_{10}) \\ Y ...
0
votes
0answers
17 views

What advantages should a weekly latency report give me over a daily report

We have a daily report that takes the days p90 website latency data and compares it with the same day over the past four weeks and tells whether the p90 latency has gone up or down for a particular ...
1
vote
0answers
151 views

Writing up findings from path analysis

I have obtained my results from a path analysis (using MPlus) and I´m not sure how go about writing a results section in APA style. The model is showing a nice fit to the data, my hypotheses are ...
0
votes
0answers
43 views

What to do with interactions that improve the model fit but are not significant?

I'm using Poisson loglinear regression (from Generalized Linear models, SPSS) to analyze different patient variables that influence LNT-lymph node yield-(poisson distribution). After removing the main ...
1
vote
0answers
95 views

Reporting generalized linear model results

I am looking for help phrasing/reporting the results of a Generalized Linear Model. I have received some feedback that my current format is difficult to understand. I have multiple predictor variables ...
1
vote
0answers
79 views

Reporting two-way ANOVA

I've been trying to figure out how to properly report a two way ANOVA with two between-subject variables and their interaction. Most references I found suggest to report it in the following way: ...
1
vote
0answers
51 views

Significant digit 354 rule from Particle Data Group

The particle data group (PDG) has a particular rule to round the value of a measurement. You can find the complete description at this link (page 13). Summarizing: ... if the three highest order ...
0
votes
0answers
14 views

Reporting change when the baseline varies

I am discussing how growth of a business changes over a time period with a colleague. The issue is, that I want to extrapolate the impact of business investment beyond maintenance. The example is a ...
0
votes
1answer
109 views

How to report results from eight paired t-tests in a scientific paper?

What would be the most efficient way to report test results from several paired t-tests in a scientific paper? If I gave a bar graph per test result (something like this) would it be too much? Should ...
0
votes
0answers
51 views

Comparing Overlapping Percentages

I observed how frequently participants exhibited five specific behaviors during testing. The total of the below percentages exceeds 100%, because some participants (30.43% of the sample) exhibited ...
5
votes
1answer
2k views

Reporting results of linear mixed-effects model

Linear mixed-effects models aren't commonly used in my corner of biology, and I need to report the statistical test I used in a paper I'm trying to write. I know that awareness of multilevel modeling ...
2
votes
2answers
201 views

Reporting regression statistics after logarithmic transformation

I'm a bit troubled about how to report linear regression statistics after log transformation of the dependent variable. I suppose I should report the transformed coefficient, but would they be easily ...
1
vote
1answer
279 views

Bootstrapped t test in SPSS: Why are some p value cells blank?

Using an independent samples t test, I am comparing the performance of 2 groups on an activity, based on the percentage of items correct (the percentage of total items correct, as well as percentage ...
2
votes
2answers
284 views

Is it worth reporting small fixed-effect $R^2$ (marginal $R^2$), large model $R^2$ (conditional $R^2$)?

In a mixed model analysis (lme4 + lmerTest for R), I want to analyse the effect of 3 predictors, say A, B and ...
1
vote
1answer
178 views

Reporting bootstrapped output for an independent samples t test

When reporting results of a bootstrapped independent samples t-test, can I just report the t statistic alongside the bootstrapped p value? Or do I also need to report confidence intervals?
4
votes
3answers
1k views

Variable is significant through stepwise regression but not in final model's summary; which should I report?

I used generalized linear mixed models (with the glmmADMB package) to identify environmental factors related to parasite abundance in rodents. I used stepwise ...
0
votes
0answers
15 views

How to analyse task repetition in a workflow system?

I have a system where the work flows through like so Open incident -> Find problem -> Validate -> Perform edit -> Sign off -> Complete Naturally this system can repeat at various stages. It's easy ...
4
votes
1answer
7k views

How do you report a Mann–Whitney test?

I am doing my dissertation, and I am conducting a number of tests. After using a Kruskal–Wallis test, I usually report the result like this: There is a significant difference ...
0
votes
1answer
693 views

Standardised or unstandardised?

I've been trying to teach myself some statistics (all social science-related) using SPSS. It's all going well so far, I'm amazed at how much I'm managing to understand given how terrible I am at ...
0
votes
0answers
89 views

How to report Stata random effects model

Can anyone tell me what is the best way to report the data from a re model? Should I just reproduce the whole table? Or should I pick out the relevant statistics? I can't find any info on this on ...
5
votes
4answers
221 views

How to report the ratio of two sets of experimental results?

I have measured the time taken to solve a problem by algorithm $X$ and by algorithm $Y$. It takes a quite long time, so I have only 10 data for each algorithm: $$ X : ( x_1, x_2, \dots , x_{10}) \\ Y ...
1
vote
0answers
198 views

How to report significance of factor levels shown in summary of glm?

The summary of my GLM shows day 12 of factor Date to be significant, but anova(model, test="Chisq") shows Date to be not significant overall. I know how to report the statistics from the Chisq table, ...
2
votes
0answers
47 views

Which of these two ways is better to report comparison of paired data?

Suppose I am comparing the computational time of two algorithms A and B. They are solving randomized problem P. Let's say I solved the problem for seeds $ 1, 2, \dots, n $ with both A and B and got ...
1
vote
1answer
99 views

Graphic representation of data

I conducted exploratory analysis of my data and got Mean and standard deviation values from the original data and plotted the data using boxplots. I conducted regression models (GLM and GLMM) on the ...
1
vote
1answer
3k views

How to report result from two-way repeated measures ANOVA?

I have conducted an empirical study as part of my master thesis. I have developed a software tool where cards can be sorted (affinity diagram) and in the study each test subject did a number of ...
5
votes
0answers
67 views

Words that estimate numerical proportions of a group

There seem to be more than a few papers that surround the use of certain words to define the probability of an event without actually using the numerical probability itself. For example, if you are ...
2
votes
2answers
83 views

Should the risk of Type II error associated with a n.s. factor be discussed if this factor significantly interacts with another factor?

When computing a 2(A)$\times$2(B)$\times$3(C) ANOVA, I observe that only factor A has a significant main effect. Factors B and C were not significant, yet display a moderate effect size and low power. ...
2
votes
1answer
52 views

Are these possible LeveneTest results?

I have experimental data of response times that differ according to the factor TrialType: Regular or ...
1
vote
0answers
21 views

Reporting percentages in preference type survey questions

I came a cross some survey results that show user preferences, asked in the form of the most and least preferred choices. The result reported was something like "x % of people chose option A as their ...
1
vote
0answers
750 views

Reporting predicted outcome of mixed effects models

I am analyzing some group-randomized longitudinal trial data with three time points using mixed effects model. Some people missed 1-2 time points, and I didn't exclude any cases with missing dependent ...
1
vote
1answer
90 views

Research paper - section dependent variable for logistic regression

In my paper, in the section methodology, I have a subsection called dependent variable. But since I am performing a logistic regression, there seem to be 2 (or even 3) things that could be named the ...
0
votes
0answers
2k views

How to report results from Friedman's test including post-hoc results

I have performed comparison of repeated measures for a group using Friedman’s test (K-related-samples test) and additional post-hoc analysis with Wilcoxon signed-rank test and Bonferroni correction. I ...
2
votes
3answers
931 views

Reporting interaction effect for a 2x3 ANOVA

I have used a 2x3 mixed between-within subjects ANOVA to assess the impact of three feedback conditions (Grade, Comment and No Feedback) on participants’ scores on the Specific-Self Efficacy Scale on ...
9
votes
3answers
2k views

Number of significant digits to report

Is there a more scientific way of determining the number of significant digits to report for a mean or a confidence interval in a situation which is fairly standard - e.g. first year class at college. ...
16
votes
4answers
463 views

Why don't we use significant digits?

Any idea why we don't use significant digits in statistics? Something along the line of we are using estimates so rules about precision don't apply ;) ?
0
votes
2answers
61 views

Are there any ways to glean useful analysis information from a comments field?

I have a dataset of data and two of the fields are user comments - (I did not design this form) I would like to know if there is anything I can do to get any information from a comments field - are ...
1
vote
2answers
588 views

Do I discuss the lack of interaction if I already discussed lack of main effects?

I conducted an experiment with 2 independent group variables (gender and language - language indicates either native speakers or 2nd language speakers) and ran a 2 way ANOVA. There were no main ...
2
votes
1answer
3k views

How to do ANOVA write-up when there is no significant effect at all?

I was conducting a 'recall of negative words' memory experiment with a two-way between-group ANOVA and got no significant main effects and no significant interaction! How can I go about explaining ...