Repeated measures data occurs when more than one measurement is collected on the same unit (e.g. subject). This data cannot be analysed through normal methods because the rows in the data are not independent due to the multiple measurements. The time sequencing of the measures may not be important.

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23 views

split-split plot design with unbalanced repeated measures in lme4 or nlme (SAS translation)

I am sorry if this answer has been answered before but most answers here (e.g. here, or here ) do not really adress my issue (or maybe I just do not see correctly how they do. I want to use a (linear) ...
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27 views

Repeated measure for correlation in sparse data

We have 2 groups, 20 subjects in each, 5 "time points" and one dependent variable. For each subject we measured a continuous independent variable for 5 "time points" (we consider two options, "time ...
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1answer
17 views

Multifactorial analysis of variance with repeated measurements-literature

What is the difference between multivariate and multifactor ANOVA? Does anybody have any pointers to downloadable literature about multifactorial analysis of variance with repeated measurements?
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17 views

nested paired tests

I have a design with patients treated with a certain drug.We have patient data before and after taking drug.Within in these patients there is are two types of people , responders and non responders in ...
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25 views

Help find a statistical test for proportion of a binary outcome with repeated measures

Here is an illustration of my problem: I have two stimuli (A and B) given to a number of subjects. Each subject is sequentially subjected to both stimuli 5 times (AAAAABBBBB or BBBBBAAAAA, but not ...
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43 views

ANOVA with three IVs

I have a following problem: I have some research data that need to be analysed. There are three randomized independent variables (binary) and one dependent variable (reaction time). The data consists ...
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13 views

How does GEE (Generalized Estimating Equation) treat different cluster size?

I have a population of 200, 000+ patients and their hospital visit information. I'm trying to see if having a certain disease would have an effect on whether they will have readmission or not (this is ...
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6 views

Help: testing repeatability within a group, and conducting a PCA for observations within those perhaps-repeatable variables?

I'm trying to analyze behavioral observations of nesting birds within and across various field sites. I know that certain behaviors, such as latency to flight, amount of vocalizations, and defensive ...
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16 views

Analysis of pre-post data when 2 treatments given serially to same subjects

I have following data from a cross-over trial where subjects were given 2 types of treatments separated by a washout period. For each treatment measurement was made in pre and post treatment period. I ...
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16 views

Losing power by doing repeated measure instead of standard anova

I have an experiment with one within subjects factor. It has 3 levels: sleep deprived (24 hours), sleep deprived (12 hours), not sleep deprived. Over the course of 6 weeks we run a counterbalanced ...
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65 views

Repeated measures ANOVA: what is the normality assumption?

I am confused about the normality assumption in repeated measures ANOVA. Specifically, I am wondering what kind of normality exactly should be satisfied. In reading the literature and the answers on ...
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1answer
16 views

Comparison of multiple independent data points (of variable number) for each subject within a group

I'm looking for a test to statistically compare different groups that have multiple data points for each subject within a group. Without getting into too much detail about my specific measurements, an ...
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1answer
18 views

Compound annual growth rate (CAGR) applied to non-financial growth

I’m trying to understand if “compound annual growth rate” is appropriate when applied to non-financial measurements. For example, when that term (and the appropriate calculation) is applied to money ...
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30 views

Repeated measures through time using mixed effects in R, plus post hoc tests

I have been trying to figure out how to do a fairly basic repeated measures analysis using linear mixed effects in R, and then analysing it using post-hoc tests. The problem is that I'm not sure ...
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1answer
38 views

Repeated measures ANOVA in retail sales programs?

I am studying the effects of a sales program on the weekly unit sales at ~1,000 retail locations. I am having trouble figuring out which statistical test is appropriate to run for this scenario. Here ...
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0answers
17 views

R anova (aov) repeated measures gives same effect in different error sources

I have a repeated measures design, where A and B are within-subjects factors. I tried m1 <- aov(y ~ A * B + Error(subject/(A*B))) summary(m1) But the results ...
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21 views

questions about ancova model with both random and fixed effects

I have the following data (I show part of the data below) and would like to consider the ANCOVA model with type (a factor with levels 1 and 2) a fixed effect and batch a random effect nested within ...
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12 views

Mixed effects model instead of repeated measures anova

Considering similarity of Two Way Mixed Factorial Designs on http://ww2.coastal.edu/kingw/statistics/R-tutorials/repeated.html and Mixed Model approach on ...
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13 views

repeated measures ANCOVA; covariate main effect and post-hoc tests

let's say I run a repeated measures ANCOVA, with valence (negative and neutral) as repeated measure and age as a covariate. what I want to know is how age affects my data. 1)I get a significant ...
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31 views

Time Between Treatment

Suppose a treatment (A or B) is administered multiple times. Consider the following table: ...
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9 views

interaction effect on consecutive gestures from different sets

I am conducting an within-subject experiment in which each participant has to perform 2 consecutive gestures with one arm. (with repetitions). To make it simple, let's say that I have 2 sets of ...
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How to asses significant differences in between participant pretest posttest design?

So, the groups would be control group and experiment group. The scale used is ratio. Both will be given pretest and posttest. So, how should I assess the differences between control group and ...
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4 views

repeat measures, continuous/scale data, 3 dependent variables, 7 independent

Children played a comprehension game on an iPad and their attentional patterns were observed and coded for using video coding software. The duration of 7 different behaviors were coded for. Pupils ...
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62 views

Longitudinal data analysis where meaning and metric of response variable varies over time

Determining what factors predict change over time is a topic of investigation in many fields and there are a variety of readily implemented methods for analysing repeated measures in the same metric. ...
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15 views

Explaining mixed-model interactions with ANOVA?

I have searched through the answers on this forum and I couldn't find any detailed explanation to my question about linear mixed models. Here is my setup: 4 groups with treatment X (one of which is ...
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9 views

Can I use a covariate in a RM-ANOVA design and can the covariate be ordinal?

I'm having some trouble deciding what the best approach is to may data. The following is the setup of the study: Between-subjects factor: Group (2 levels) Within-subjects factors: Time (2 levels), ...
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Differences in variables constructed by counting.

I have constructed a frequency variable from counting events of certain magnitude (e.g, 1,2,3...) from a time dependent experiment with animals. I have two groups (Trained vs Control) and two phases ...
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20 views

Repeated measures anova and split plot design analysis

It is mentioned that repeated measure anova may be very similar to split-plot design: Is a "split plot" ANOVA with two factors the same as two-way ANOVA with repeated measures in one ...
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13 views

Error term in anova

There is an example on this page (last part): http://www.personal.psu.edu/mar36/stat_461/split_plot/split_plot.html Rats were fed with different diets after which glycogen in their livers was ...
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11 views

pooling the results from a repeated measures using multiple imputation

How can I pool the results from a multiply imputed repeated measures analysis? SPSS does not the pooling, as it does for other analysis types. From a technical standpoint, it is not at all clear. ...
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12 views

HELP: Bayesian Multi-level model with seasonality

I am trying to define a Bayesian Multi-level model which has seasonality in BUGs. I have defined the model (below).I have attached a graphical representation of what im trying to model. eventually ...
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9 views

Repeated measures data transformations: What level?

I currently have some data from a repeated measures experiment. Since the dependent variable was response time the distributions are a bit positively skewed. If I want to do some inverse or log ...
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13 views

Repeated measures analysis where fixed effect changes within subjects

I have sales data from a set of stores that are involved in a tournament-like competition where each week's average invoice amount is used to determine whether or not a store advances to the following ...
0
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1answer
19 views

Analyzing multiple, within-subjects, non-independent ordinal rankings

So I'm working with some previously collected data where participants (N=139) were asked to rank 3 types of events (1 being best, 3 being worst) for 6 separate scenarios. The question of interest is ...
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34 views

Linear mixed model with two correlated dependent variables

I'm using the swissmunicipalities dataset in the package sampling of R. I consider two correlated dependent variables, the population between 40 and 65 (Pop4065), and the population aged 65 or more ...
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analysing repeated measure input data with single dependant output ONLY at end?

I have a question that i only have a vague idea of where to start with it. I have a data set in the standard 2D flat table form with 3 potential outputs and many many inputs. Any one output consist ...
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28 views

Mixed Models with random effects

I'm trying to fit a mixed model with random effects for the independent variable. I would like to double check whether I got my analyses right and hope you could help! I'm studying whether bleedings ...
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21 views

Repeated Measures ANOVA?

I am an undergraduate student studying psychology using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured ...
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24 views

Repeated measures ANCOVA

I have a data set with training effects and I measured the outcome variable before, during and after training. This is a repeated measures design and I hope to find an effect of training on the ...
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17 views

repeated non-parametric Anova with a normal covariate options, best approach?

I'm looking for input on the best approach to a problem. I have data where each person experienced three conditions during a testing session (different priming stimuli for a memory test). There was ...
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9 views

repeated measurements with different subjects over time

I am measuring methane oxidation over time. I sampled at 5 different time points (T1, T2, T3, T4, T5) to see if oxidation had occurred, each sampling time, say T1: I sampled 5 bottles, and I sampled ...
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8 views

Running a Two-Way Repeated Measures ANOVA with missing data

I'm trying to run a Two-Way rep measures Anova on a data set with two independent variables, and three time factors for each variable. However due to the severity of the experiment, not all ...
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10 views

Longitudinal design with missing values at first time point

I carried out an intervention with 3 time points (2 pre-intervention, 1 post-intervention) with 2 groups ( n =18 intervention, n = 22 control). Basically I am missing some observations from some of ...
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23 views

Gender differences against experimental IV conditions

I am a psychology student using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured by the DV of pulse rate ...
0
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0answers
47 views

Repeated Measures Design but also testing order effects in SPSS

I am a psychology student using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured by the DV of pulse rate ...
0
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0answers
14 views

Is there another way to make pretest scores in a Solomon design match?

As a research design, I applied the Solomon design, resulting in four groups: no pretest - manipulation A - post test no pretest - manipulation B - post test pretest - manipulation A - post ...
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22 views

Regression involving multiple measurements on known values (calibration)

Suppose I have two continuous variables Y and X and I want to predict a Y value given a specific X value. However, the dataset I have is composed of 15 particular Y values (that are known values) ...
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20 views

Repeated Observations Due to Pairings in Logistic Regression

I have data with repeated observations within a given year. Here's a snippet of the data: ...
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19 views

How to test for interactions of continuous measure with two repeated-measures factors in R?

I am doing an items analysis of difficulty ratings of a large set of math problems which were constructed to represent the factorial combinations of two binary factors, feature1 and feature2. The ...
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74 views

Two-Way Repeated-Measure design with lme4

I would like to model a treatment effect in two different groups, controlled for some co-variates (like age and education), and I assume that a two-way repeated-measure Anova would be the right ...