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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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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10 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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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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Correction for multiple comparisons repeated measures MANOVA [closed]

I am running a repeated measures MANOVA and wanted to know the best way to correct for multiple comparisons. If I use Bonferroni, for example, how would I go about doing that within SPSS?
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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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8 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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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 Different rats have been fed with food and glycogen in liver was tested: 6 rats; 1 ...
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7 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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8 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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7 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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11 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 ...
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18 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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23 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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23 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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18 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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19 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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11 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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7 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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4 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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14 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 ...
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17 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 ...
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10 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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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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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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17 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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62 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 ...
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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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13 views

validity when between subjects factor makes group size uneven

I'm doing a repeated measures analysis and, while I have even amounts of samples for each subject, and the variances and sphericity are fine for the dependent measures, I'm worried because I have ...
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24 views

Comparing Binomial Success Parameters in a Stratified Approach - An Example in Biostatistics

I would like to contrast the effectiveness of drug treatment and surgical treatment in a study with the following data. Each row represents one trial, and each trial uses either drugs or surgeries to ...
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4answers
321 views

Develop a statistical test to distinguish two products

I have a data set from a customer survey, I want to deploy a statistical test to see whether there is significance difference between product 1 and product 2. Here is a data set of customers' ...
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Use clustered S.E. or FE/RE for binary data in an experimental within-subject design?

I am analyzing a 2x2 experimental within-subjects-design, i.e. I have data from all subjects for all four possible treatment combinations. Lets say treatment X has states X1 and X2 and treatment Y ...
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21 views

What is going on here? Omnibus repeated measures ANOVA is marginal, but follow-up planned pairs <.05

I have a repeated measure ANOVA with a decent sample size (124 participants, with a score for each person for 3 conditions). The data are moderate to strongly positively skewed, (though similarly). ...
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McNemar's Test for repeated sex ratio data

I have proportion data (sex ratio of a dioecious plant) for a population that was measured three times. I would like to know if a McNemar's Test is the most appropriate analysis to answer the ...
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How to model time-series data with nested random and fixed effects?

I'm analysing PAM fluorescence data from an experimental set-up that I duplicated from an earlier experiment with a missing control. That's why I haven't given the statistics of the experiment much ...
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1answer
22 views

Using subject-specific random intercept to account for repeated measures over time

I have an epidemiologic study on subjects with yearly repeated measures on a count variable as an outcome and various yearly measured predictors. The study population changes every year somewhat, so ...
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22 views

What post hoc test can you use after performing a McNemar-Bowker test?

I have performed a McNemar-Bowker test on pig carcass skin lesion scores before (time 1) and after (time 2) routine slaughter processes. Skin lesion scores range from absent (0) to severe (3). Is ...
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2answers
331 views

The fallacy of splitting data collection time into shorter intervals to reduce error

Say you measure the (roughly constant) rate of something (i.e., counts of something per unit time) over 30 seconds, and you repeat this reading four times to find the mean and standard error of the ...
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20 views

ANOVA based on mixture of within-subject and between-subject experimental design

I have finished an experiment, and I used a mixture of within subject and between subject design, I am wondering if there is a specific name for this type of experimental design? I would like to find ...
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1answer
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Statistical tests for a binary response variable with more than 2 repeated measures?

Question: Did plants experiencing treatment A vs. treatment B receive significantly more or less observations with zero visits from pollinators? Methods: Plants were clustered by similar physical ...
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About S/N and averaging

It is well known that Thus, in the ideal case S/N increases with the square root of the number of measurements that are averaged. (Wikipedia) The assumptions are that (1) signal and noise are ...
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Selecting best dependent variable in Repeated measures and multivariate data

I have a number of outcome variables both continuous, scores and categorical. I am trying to find the best methodology to select the best variable(s) among the many dependent variables that gives me ...
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1answer
21 views

Properly interpreting and presenting a differences in differences t-test in written and table forms

I have two separate groups of students. A control (n=23) and intervention (n=19) group. Both groups took a pre test measure (score of 0-100). I have done an independent t-test on the Post_minus_Pre ...
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1answer
43 views

Can I do a dependent t-test if pre & post were anonymous?

I am trying to analyze the following case study using SPSS. What I have done so far as part of my research is to conduct a case study to measure the affect the introduction of different technology ...
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Q1: Median Split and Q2: repeated measures multiple regression analysis

Question 1: I have performed a pretest in order to analyse which products are considered to be hedonic or utilitarian based upon characteristics. These characteristics were rated with a Likert scale. ...
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6 views

repeated measures mixed model with different number of measure per group

I have a an experiment with 3 groups. Two of these groups have the outcome of interest measured at baseline, 3 months and 12 months and one group has only been measured at baseline and 12 months. My ...
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23 views

Repeated Data Points, Weighted Linear Regression

Building on the question here; If every sample in OLS is repeated, then coefficients stay the same, but standard errors go down, and as a result, previously insignificant variables can become ...
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Analyzing Repeated Measures from Continuous Predictors

Calling all stats-fiends, and other quantitative thinkers - I have the following design: -A dependent variable (self-report measure) administered at 3 time points- -A set of continuous predictors; ...
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Analysis of survey data

This is the first time I am analyzing a survey. I have limited knowledge about stats and the best practices and would appreciate some pointers as to what kind of analysis I should perform on the data. ...