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on 19-May-2015 (Tue)

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Flashcard 150891359

Tags
#m249 #mathematics #open-university #statistics #time-series
Question
what does the expanded m-times (i.e. non recursive) simple exponential smoothing formula looks like?
fully recursive is:

\(\hat{x}_{n+1}\)= αxn + (1 − α)\(\hat{x}_n\)
Answer
expanded m-times is
\(\large \hat{x}_{n+1} = \sum_{i=0}^m\alpha(1-\alpha)^ix_{n-i}+(1-\alpha)^{m+1}\hat{x}_{n-m}\)


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If a time series X t is described by an additive model with constant level and no seasonality, 1-step ahead forecasts may be obtained by simple exponential smoothing using the formula \(\hat{x}_{n+1}\)= αx n + (1 − α)\(\hat{x}_n\) where: x n is the observed value at time n, \(\hat{x}_n\)​and \(\hat{x}_{n+1}\)are the 1-step ahead forecasts of X n and X n+1 , and α is a smoothing parameter, 0 ≤ α ≤ 1.

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Flashcard 150891523

Tags
#cardiovascular #medicine
Question
What is Atrial Fibrillation ?
Answer
A chaotic, irregular atrial rhythm at 300 – 600 bpm


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Flashcard 150891530

Question
In Atrial Fibrillation, how much does the cardiac output decrease by ?
Answer
Cardiac output drops by 10 – 20 % as the ventricles aren’t primed reliably by the atria


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Flashcard 150891537

Question
What are the common causes of Atrial Fibrillation ?
Answer
Heart failure/ischaemia; hypertension; MI (seen in 22 %); 48 PE ; mitral valve dis- ease; pneumonia; hyperthyroidism; caff eine; alcohol; post-op; K + ; Mg 2+ .


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Flashcard 150891544

Question
What are the symptoms seen with Atrial Fibrillation ?
Answer
asymptomatic or cause chest pain, palpitations, dysp noea, or faintness


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evolve
Se l'applicazione è scritta in modo veloce ma non è evolvibile non serve a niente ed è dannosa!

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quickly to meet changing requirements
Le metodologie Agile sono basate sull'anticipazione dei cambi di requisiti.

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Individuals and interactions over processes and tools
Working software over comprehensive documentation
Customer collaboration over contract negotiation
Responding to change over following a plan

Le cose a destra sono importanti comunque, ma quelle a sinistra hanno più importanza!

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Product development where a software company is developing a small or medium-sized product for sale.
Agile funziona bene se il prodotto lo puoi sviluppare da solo (dal punto di vista dell'azienza). Se c'è necessità di collaborare con altre aziende non va più bene

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foreachisaspecialkindofloopingstatementthatworksonlyonarrays(and objects).

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oreachisaspecialkindofloopingstatementthatworksonlyonarrays (andobjects).

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Article 150891762

php 6

6.4 Looping Through Arrays with foreach As you just saw, it's easy to use each() in combination with while to loop through all the elements of an array. In fact, there's an even easier way: you can use PHP's foreach statement. foreach is a special kind of looping statement that works only on arrays (and objects). You can use it in two ways. You can either retrieve just the value of each element, or you can retrieve the element's key and value. Using foreach to Loop Through Values The simplest way to use foreach is to retrieve each element's value, as follows: foreach ( $array as $value ) { // (do something with $value here) } // (rest of script here) As you might imagine, the foreach loop continues to iterate until it has retrieved all the values in the array, from the first element to the last. On each pass through the loop, the $value variable gets set to the value of the current element. You can then do whateve



foreach is looping statement works only on arrays (and objects).

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php 6
ough Arrays with foreach As you just saw, it's easy to use each() in combination with while to loop through all the elements of an array. In fact, there's an even easier way: you can use PHP's foreach statement. <span>foreach is a special kind of looping statement that works only on arrays (and objects). You can use it in two ways. You can either retrieve just the value of each element, or you can retrieve the element's key and value.