La estimación mejora a medida que llegan nuevas mediciones.

A medida que means something like as, as/while, or in proportion as.

In this sentence:

• La estimación mejora = The estimate improves
• a medida que llegan nuevas mediciones = as new measurements arrive

So the full idea is:

• The estimate improves as new measurements come in.

This expression is very common when one thing changes gradually in relation to another.

Examples:

• A medida que अभ्यास? — not Spanish, so ignore; correct examples:
• A medida que pasa el tiempo, aprendemos más.
  As time passes, we learn more.
• A medida que lees más, entiendes mejor.
  As you read more, you understand better.

A helpful way to remember it:

• medida is related to measure
• so a medida que originally suggests in step with / in proportion as

Because the subject of llegan is nuevas mediciones, which is plural.

Breakdown:

• nuevas mediciones = new measurements
• Since that is plural, the verb must also be plural:
  • llega = arrives / comes for a singular subject
  • llegan = arrive / come for a plural subject

Compare:

• Llega una nueva medición.
  A new measurement arrives.
• Llegan nuevas mediciones.
  New measurements arrive.

So llegan agrees with mediciones, not with estimación.

Spanish often uses the present tense to state a general truth, a process, or something that regularly happens.

Here, La estimación mejora a medida que llegan nuevas mediciones describes a general principle:

• when more measurements arrive, the estimate improves

It is not necessarily talking about one specific moment only. It sounds like a standard fact or rule.

English often does the same:

• The estimate improves as new measurements arrive.

Spanish present tense is very common for:

• scientific statements
• instructions
• general observations
• things that happen repeatedly

In Spanish, plural nouns often appear without an article when they mean some / new / additional things in general, not specific ones already identified.

So:

• llegan nuevas mediciones = new measurements arrive / some new measurements come in

If you said:

• llegan las nuevas mediciones

that would usually sound more specific, like:

• the new measurements arrive
• meaning a particular set of measurements already known in the context

So the version without las is natural here because it refers to new measurements coming in generally, not a specific named batch.

Spanish often uses the definite article (el, la, los, las) in places where English may or may not use the.

Here, la estimación refers to the estimate as a known concept in context. It sounds natural and complete.

In many technical or scientific sentences, Spanish prefers the article with a noun:

• La temperatura aumenta...
• La velocidad cambia...
• La estimación mejora...

Dropping the article here would usually sound less natural:

• Estimación mejora... ❌

So la is needed because estimación is a countable noun being used as the subject.

Because mejorar can be used intransitively here, meaning to improve on its own.

• La estimación mejora. = The estimate improves.

That means the estimate itself becomes better.

By contrast, mejorar algo can also be transitive:

• Los nuevos datos mejoran la estimación.
  The new data improve the estimate.

And se mejora can appear in other structures, but it would not be the most natural choice here.

Compare:

• La estimación mejora con más datos.
  The estimate improves with more data.
• El algoritmo mejora la estimación.
  The algorithm improves the estimate.

So here the sentence focuses on the estimate undergoing improvement, not on explicitly naming an agent doing the improving.

Yes, in this sentence estimación matches estimate very well, especially in a technical, mathematical, or scientific context.

It often refers to:

• an approximate value
• a statistical estimate
• a predicted quantity based on available data

Depending on context, related Spanish words could be:

• estimación = estimate, estimation
• cálculo = calculation
• aproximación = approximation
• predicción = prediction

Why estimación is a good choice here:

• the sentence suggests a value or model is being refined as more data comes in
• that is exactly the kind of thing estimación often describes

Yes, adjectives in Spanish can often go after the noun, and sometimes before it. Here, nuevas mediciones is the normal, natural order.

• nuevas mediciones = new measurements

With adjectives like nuevo, putting the adjective before the noun is very common.

Compare:

• nuevas mediciones = new measurements
• mediciones nuevas can also be possible, but it may sound slightly more contrastive or descriptive depending on context

Very roughly:

• nuevas mediciones = newly arrived/additional measurements
• mediciones nuevas = measurements that are new (emphasizing the quality of being new)

In this sentence, nuevas mediciones sounds the most natural.

Usually, a medida que is followed by the indicative when talking about real, actual, or ongoing events, which is what happens here:

• a medida que llegan nuevas mediciones

Since the arrival of new measurements is treated as a real process, Spanish uses llegan (present indicative).

That is the most common pattern:

• A medida que avanzamos, aprendemos.
• A medida que crece la ciudad, cambian los problemas.

A learner may wonder about the subjunctive because many conjunctions trigger it, but a medida que normally does not do so in straightforward factual statements like this one.

Yes. Conforme or conforme van llegando nuevas mediciones can express a similar idea.

Examples:

• La estimación mejora a medida que llegan nuevas mediciones.
• La estimación mejora conforme llegan nuevas mediciones.

Both are valid. However:

• a medida que often feels especially clear for gradual change
• conforme can sound a little more formal in some contexts, though it is common
• según is usually not the best replacement here, because it more often means according to or sometimes depending on

So a medida que is an excellent, very natural choice.

This order is natural because Spanish often puts:

1. the main statement first
2. then the clause explaining under what process or condition it happens

So:

• La estimación mejora = main idea
• a medida que llegan nuevas mediciones = additional information explaining how/when that improvement happens

You could also reverse the order:

• A medida que llegan nuevas mediciones, la estimación mejora.

This is also correct. The meaning stays basically the same. The difference is mostly one of emphasis:

• original order: focus first on the estimate improves
• reversed order: focus first on as new measurements arrive

Both are good Spanish.

The given sentence sounds natural and fairly neutral, especially in technical or academic Spanish. A more conversational version might be:

• La estimación mejora conforme van llegando nuevas mediciones.
• La estimación mejora cuando empiezan a llegar más mediciones.
• La estimación va mejorando a medida que llegan nuevas mediciones.

Small differences:

• va mejorando emphasizes gradual change even more
• van llegando emphasizes that the measurements come in little by little

So if you want a slightly more dynamic version, you could say:

• La estimación va mejorando a medida que van llegando nuevas mediciones.

But the original is already very good Spanish.

In a medida que, the que links the expression to a full clause with a verb.

So:

• a medida que llegan nuevas mediciones

Here, que introduces the clause llegan nuevas mediciones.

You can think of the structure as a fixed expression:

• a medida que + clause

Examples:

• A medida que estudio, entiendo más.
• A medida que crecen los niños, cambian sus necesidades.

So learners should usually memorize a medida que as one chunk rather than trying to translate each word separately every time.

Estimación is pronounced approximately:

• es-tee-ma-SYON

The written accent on -ción shows that the stress falls on the final syllable:

• es-ti-ma-CIÓN

This is important because without the accent, Spanish stress rules would suggest a different pronunciation.

A very common pattern in Spanish is:

• -ción nouns, stressed on -ción

Examples:

• información
• medición
• estimación
• predicción

Also notice:

• mediciones loses the written accent because the stress pattern changes naturally in the plural:
  • medición
  • mediciones

That is a very common spelling pattern too.