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

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 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

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View