# Tagged Questions

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### Running a Tukey's test on a repeated measures ANOVA in R

I've come across several posts dealing with post hoc tests of Repeated Measurs ANOVA. I came up with the below code in R to attempt this, but considering some of the posts on this subject I wanted to ...
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### Analysis of a time series with a fixed and random factor in R

I have a dataset which I am not sure how to analyse. The dataset came from the following experiment: I grew plants (2 different types) and measured their height at different time point (each plant ...
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### Is two-way ANOVA appropriate?

This is the description of my study. I'm experimenting with three plants: A, B, and C. These plants are supposed to reduce blood glucose for diabetic patients. I want to determine which of these three ...
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### Accounting for trend using complete block design

I would like to use ANOVA to compare the population means for several data samples consisting of the concentrations of a groundwater contaminant obtained from several groundwater monitoring wells. ...
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### Calculating differences between groups and across time (age)

Let's say I have data of one variable $V$ measured for two groups of individuals ($a$ and $b$) and I want to see whether there is a significant difference between them and over time, i.e. $V_a$ stays ...
158 views

### How to prove statistical significance between the 4 seasons

I have data regarding the number of deaths in a city over 35 years. I've collated the data, and now wish to prove the difference in total number of deaths between seasons is significant. Spring has ...
235 views

### One-way repeated measures anova

I tried finding an answer to this question on this and other sites but to no avail - if I am missing something please excuse my inability to locate the answer! Basically I have several dependent ...
115 views

### Test for significance in a time series using R

I've got a time series data set that looks at population numbers on a yearly basis, and I would like to know if there is a significant difference between certain years, and if so- which years are ...
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### How do I analyze the monthly variance of discrete series?

My company gathers all sorts of series for page views, unique visitors and many other user data (collected by our web servers). As I see it, these sets of series are discrete since they are all ...
291 views

### Cross validation using experimental design methods?

I have a question about using experimental design methods for cross validation in a non-conventional approach. I will use an illustration to explain the question. Imagine you have 100 time series ...
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### Non-repeated measures ANOVA of time series with different subjects per treatment in R?

I have the following experimental layout: five different treatments - harvesting rates, ranging from 0 to 1, indicating proportion of branches per plant harvested 75 plants, randomly assigned plants ...
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### Comparing the means of two time series

I have data sets of the returns of two indexes in the same market (two different sets of stocks constituting each index), with 496 observations for each. I want to compare if the means are ...
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### Aligned rank transform on time series data

I have some time-series data that I wish to test to see if a certain factor has an effect. There are few samples per time step (10 on average), but the whole time-series has 306 samples. When divided ...
148 views

### Which statistical method should be used in the study of stability of an enzyme?

I did a study monitoring the stability of an enzyme exposed to different conditions over time. Each day for 30 days, an aliquot was taken from each storage sample and analyzed in duplicate. I wanted ...
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### What is best for comparing variability for environmental time series data: repeated-measures ANOVA or linear mixed models?

I've collected environmental data on the dust level using direct-reading instruments. The outputs from the instruments are concentrations recorded at each minute over 1 hour. The data collected at ...
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### Is is possible (or advisable) to do Change Point Analysis on sequence of groups with R?

I'm familiar with post-hoc testing with ANOVA for exploring differences between a sequence of groups, but recently I've been reading about Change Point Analysis ...