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I never create a folders, but from now I´m going to do that!

Mohammad Adel K... replied on Jordan Roger Vivier Star Strass Mules uMpj2Vs3ZO

Easy and useful

Huynh Mai replied on Vietnam Aquazzura Sofia 105 Suede sandals Ln5t6

So simple

khin La Pyae WIn replied on Burma Permalink

I don't understand . Task 3 Who replied to Hatem Trabelsi's email? Plz explain me.

Peter M replied on Poland Permalink

Hello khin La Pyae Win,

We can see who has replied to the first email because two later emails have the same subject with 'RE' at the front, showing that they are replies to the first email.

Best wishes,


The LearnEnglish Team

Samina Akter replied on Bangladesh Permalink

I don't understand how to create these folders separately i.e 1, 2, 3 accordingly. Please help me.

Kirk replied on Spain See by Chloé Espadrilles bordeaux vOY6zOCcyR

Hello Samina Akter,

Do you mean the three Tasks? First you must press on the word 'Task' (or 'Task 2', etc.) and then you should see an exercise. In the first Task, you must click or press on a word and then click or press on the gap where you want it to go - that should make it move there.

In the other two tasks, you must click or press on the small circle next to the correct answer. At the end, press the Finish button to see if your answers were correct or not. The Finish button becomes Show Answers - if you press that, the correct answers will appear.

All the best, Kirk The LearnEnglish Team

rameshlokanayak replied on India Permalink

Hello Peter, Good Morning, I request you to correct the mail content.

I want to send it to my Head pls find the back ground of the mail.

During my business visit, customer was complaining about duplicate items supplied by unauthorized distributor.

I am bringing to your knowledge, pls talk to Mr. Hegde, Mlabs regarding unauthorised distributors supplied by duplicate items. Mlabs has placed the TLC plates order with Orange Trader, Bombay.(unauthorized distributor.) But, they have supplied Merck Duplicate items to Veerasandra plant. Now customer has asked us to give the Merck Authorised Distributors Names. Based on our mail communication, they want to reject the material. So, Can I send a mail communication to Mlabs, like we have authorised only three distributor are chem, Sri scientific SM Scientifics.

Thanks. Regards, Rameshkumar, D

Peter M replied on Poland Salomon XA PRO 3D Trail running shoes red dalhia/fiery red/black IPNC9nGlP

5.5 Once again: randomization vs. comparability

Apart from the rather explicit rhetoric of a “valid framework”, there is also always the implicit logic of the experiment. Thus, although the received theory emphasizes that “actual balance has nothing to do with validity of statistical inference; it is an issue of efficiency only” [ Dolce amp; Gabbana Leopard Print Classic Sneakers vawgR
]; comparability turns out to be crucial:

Many, if not most, of those supporting randomization rush to mention that it promotes similar groups. Nowadays, only a small minority bases its inferences on the known permutation distribution created by the process of randomization; but an overwhelming majority checks for comparability. Reviewers of experimental studies routinely request that authors provide randomization checks, that is, statistical tests designed to substantiate the equivalence of and . At least, in almost every article a list of covariates—with their groupwise means and standard errors—can be found.

A narrow, restricted framework is only able to support weak conclusions; there is no such thing as a “free lunch.” Therefore, upon reaching a strong conclusion, there must be implicit, hidden assumptions (cf. [ 19 ], pp. 139, 155). In particular, a second look at the “little-assumption” argument reveals that it is the hidden assumption of comparability that carries much of the burden of evidence: It is no coincidence that in Pawitan’s example an eye drug was tested. Suppose one had tested a liver drug instead. The same numerical result would be almost as convincing if such a drug had been applied to twins. However, if the liver drug had been administered to a heterogenous set of persons or if it had been given to a different biological species (mice instead of men, say), exactly the same formal result would not be convincing at all; since, rather obviously, a certain discrepancy a priori may cause a remarkable difference a posteriori.

Savage’s example is quite similar. No matter how one splits a small heterogenous group into two, the latter groups will always be systematically different. Randomization does not help: If you assign randomly and detect a large effect in the end, still, your experimental intervention the initial difference between and may have caused it. All “valid” inferential statistics is, in a sense, an illusion, since it cannot exclude the straightforward second explanation. Instead, it’s the initial exchangeability of the groups that turns out to be decisive; similarity of and rules out the second explanation and leaves the experimental intervention as the only cause.

In conclusion, comparability, much more than randomization, keeps alternative explanations at bay. Since it is our endeavour to achieve similar groups, minimization is not just some supplementary technique to improve efficiency. Rather, it is a straightforward and elaborate device to enhance comparability, i.e., to consciously construct similar groups. (The influence of unknown factors is discussed in Section 4.) Though, at times, we fail, e.g. “it does not seem possible to base a meaningful experiment on a small heterogenous group” [ 23 ], there can hardly be any doubt that “the purpose of randomization is to achieve homogeneity in the sample units. [Thus] it should be spelled out that stability and homogeneity are the foundation of the statistical solution, the other way around” [ 52 ], p. 70 (my emphasis).

In a nutshell, nobody, not even Fisher, follows “pure Frequentist logic”, in particular the distribution that randomization generates. In a strict sense, there is no logic at all, rather a certain kind of mathematical reasoning plus—since the formal framework is restricted to sampling—a fairly large set of conventions; rigid “pure” arguments being readily complemented by applied “flexibility”, consisting of time-honored informal reasoning and shibboleth, but also outright concessions. Bayesians noticed long ago [ 28 , Melvin amp; Hamilton KATRIN Ankle boots brown PdvVti363p
] that “Frequentist theory is shot full of contradictions” [ IRO Woman Ruffled Metallic Texturedleather Pointtoe Flats Size 36 uBDpK
], and during the last few decades, efforts to overcome the received framework have gained momentum.

In the 20th century, R.A. Fisher (1890–1962) was the most influential statistician. However, while his early work on mathematical statistics is highly respected in all quarters, hardly anybody relies on his later ideas, in particular fiducial inference [ 24 ]. Randomization lies in-between, and, quite fittingly, public opinion on this formal technique has remained divided.

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