Desired sample proportion/minimum sample size in each group if we want to compare them?

I need to conduct a study in which the treatment group has two levels, say A and B. The sizes of these groups are really different, size of group A is 1 million while the size of B is 20,000. I...

04 May 2019 7,657 22 View

What is the meaning of fractional difference parameter d in ARFIMA model?

I know that the series is stationary and has long memory property if the fractional parameter d is between 0 and 0.5. But is it for stationarity or for testing that the series has a long memory?...

04 May 2016 8,061 5 View

Why does long memory property common in financial and economic fields?

I've read articles, journals and books regarding long memory property of a time series data. And most of it found that, it is common in financial and economic perspective. I know , for example, in...

03 April 2016 4,756 7 View

Where can i download S-PLUS trial version?

i've been searching for the trial version of s-plus in internet but i found none. Anyone please tell me or provide me a link where I can download it?

03 April 2016 5,829 1 View

Arfima forecast codes in R?

Hi, i just want to ask what is wrong with my codes that the forecast plot looks like in the attach file. The codes are these, > x ...

10 November 2015 9,765 0 View

How do I create power series expansion of long memory properties of time series?

Hi. I look at the journal of Hosking in proving the properties of ARFIMA (0,d,0). It says there, when d < 1/2, the power series expansion of (1-z)^(-d) converges for absolute value of z less...

10 November 2015 1,314 3 View

Topics for master's thesis?

Hi! i'm still confused of what problem in statistics should i consider to be included in my study. I want to find a topic for my thesis but i find it hard looking for it. can anyone suggests?

06 July 2015 6,238 5 View

Can I ask for a Randomization topic?

Can anyone give me a topic in statistics that might involve using randomization? just like the one sample test, anova, regression.. But this particular topics were already absorb in my class. So i...

02 March 2015 9,074 8 View

ARCH in R Software?

02 March 2015 9,232 1 View

Does anyone know about R codes for Spearman's correlation with randomization?

I am trying to do a randomization test in Spearman's correlation in R. And i find it difficult to do the randomization part.

02 March 2015 122 3 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

How to address this issue in the analysis of Real-Time PCR results?

To dear Researchers, I was analyzing a series of concentration for estimation of Real-Time PCR efficiency. The concentration was 1:10. I used MS-excel to evaluate Slope. The result of slope was -8...

01 March 2021 8,683 4 View

How to make a time series imputation benchmark ?

Hello ! In a work, I have to benchmark different algorithms to fill in missing values in time series. I insist on the fact that this is imputation and not forecasting. In my case, I have access...

24 February 2021 7,470 7 View

How to interpolate from a time-series database ?

Hi, I am having trouble with a problem, in the field of Optimal Control and the generation of optimal time-series. Let's consider a system, whose dynamics are represented by dx/dt =...

24 February 2021 9,105 2 View

Can we recognize signs of the "volatility clustering" property of a time series in its time domain plot?

My purpose is to recognize the volatility clustering property without statistical tests such as The Lagrange Multiplier (LM) test.

24 February 2021 4,150 3 View

How can I obtain time series data by country on night-time light (brightness) ?

Hi everyone, Please, how can I obtain time series data by country on night-time light (brightness) ? I've tried, but so far all I can find are maps. I am looking for numerical data, especially in...

24 February 2021 8,625 4 View

I have a time series data of some biochemical studies ( DNA and Chromosomal damage) which I intend to use to further predict into future ?

I have a time series data of some biochemical studies ( DNA and Chromosomal damage) which I intend to use to further predict into future without necessarily conducting the assay for an extended...

23 February 2021 7,842 1 View

How to run repeated measures in mvabund?

I have a dataset of fish species abundances collected from 6 different habitats over the course of 30 years. Fish were collected multiple times per year and environmental variables were recorded...

21 February 2021 3,838 1 View

Can someone help me with this error that I am getting while estimating a VAR model in R?

I am using annual time series data to estimate a VAR model in R. However, when I run the command to find the optimal lag length, I get the following error: Fehler in VARselect(data, lag.max = 10,...

18 February 2021 9,647 3 View

What is recommended and opened real-time or nearly real time geospatial data used in flood risk assessment and regional planning on a detailed scale?

I asked recommended real-time or nearly real-time data source for any parameters for flood risk on a microscale analysis for urban area cases in developing countries that had agglomeration urban...

18 February 2021 2,617 2 View