Tagged Questions

0
votes
0answers
25 views

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 ...
0
votes
4answers
87 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 ...
0
votes
2answers
166 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 ...
1
vote
0answers
92 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 ...
0
votes
1answer
71 views

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 ...
1
vote
0answers
255 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 ...
1
vote
2answers
475 views

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 ...
1
vote
2answers
784 views

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 ...
1
vote
0answers
178 views

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 ...
1
vote
2answers
135 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 ...
1
vote
0answers
142 views

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 ...
3
votes
0answers
168 views

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 ...
2
votes
1answer
324 views

Is ANOVA good for non-normally distributed series?

I just read Finding Seasonal Spreads, by Paul Teetor. As far as I understand how ANOVA works, it should be accurate for NORMAL distributed series. Financial series are not normally distributed, or ...
7
votes
1answer
238 views

STFT statistical analysis

I am using the evolfft function in the RSEIS R package to do a STFT analysis of a signal. The signal is one hour long and it ...