La descarga está en progreso. Por favor, espere

La descarga está en progreso. Por favor, espere

1 Applied biostatistics Francisco Javier Barón López Dpto. Medicina Preventiva Universidad de Málaga – España

Publicada porJosé Luis Silva Martín Modificado hace 9 años

Presentaciones similares

Presentación del tema: "1 Applied biostatistics Francisco Javier Barón López Dpto. Medicina Preventiva Universidad de Málaga – España"— Transcripción de la presentación:

1 1 Applied biostatistics Francisco Javier Barón López Dpto. Medicina Preventiva Universidad de Málaga – España baron@uma.es

2 2 Statistical inference Talking about the population, knowing just samples.  Usually high probability of being right (95%) or low of being wrong (5%)  Usually: Confidence interval (C.I. 95%) Statistical test (p<0,05)

3 3 For both ways we need: Standard Error Easy to interpret (believe me):  We hope the estimate (sample) being near the real value (population). How close? There is a 95% probability of the estimate being not far away than 2 standard errors of the population parameter.

4 4 Example Simulation: Let’s get samples from different size of the population and see what happens when we try to estimate the population mean, using the sample mean. Starting with sample size n=4…

5 5 Aplic. de la normal: Estimación en muestras The distribution of sample means are almost “normal” It is not as dispersed as the population. It’s S.D it is called standard error (s.e.)

6 6 Aplic. de la normal: Estimación en muestras If n grows:  The sample mean distribution is more gaussian.  Standard error decreases.

7 7 Aplic. de la normal: Estimación en muestras Puedo ‘garantizar’ medias muestrales tan cercanas como quiera a la verdadera media, sin más que tomar ‘n bastante grande’ Se utiliza esta propiedad para dimensionar el tamaño de una muestra antes de empezar una investigación.

8 8 Sample sizeMeanStd. Error answer 10 women77 6No evidence against 100 women71 1.6No 1000 women73 0.5No Mean value of BUA in young women is 85. ¿women extracted from sample are similar? Use 95% confidence

9 9 Simulation Let’s take samples of size 4. 7075 Do smokers weight more than non smokers?

10 10 Let’s take samples of size n=30 7075

11 11 Let’s take amples of size 4. Two types of error are possible 7075 No differences Accept differences type II error Type I error

12 12 , p, statistical significance sstatistical significance = p < 

Descargar ppt "1 Applied biostatistics Francisco Javier Barón López Dpto. Medicina Preventiva Universidad de Málaga – España"

Presentaciones similares

Ser vs Estar.

Ser vs Estar.
Question words AKA PALABRAS INTERROGATIVAS

Question words AKA PALABRAS INTERROGATIVAS
Dónde vs. Adónde Dónde means WHERE. When dónde is used, it is usually in relation to where someone IS LOCATED RIGHT THEN. Ex: ¿Dónde estás tú? Yo estoy.

Dónde vs. Adónde Dónde means WHERE. When dónde is used, it is usually in relation to where someone IS LOCATED RIGHT THEN. Ex: ¿Dónde estás tú? Yo estoy.
Subject Pronouns Los Pronombres Sujetos Diane Brooks FL490.

Subject Pronouns Los Pronombres Sujetos Diane Brooks FL490.
English Lesson 5.

English Lesson 5.
Question words AKA PALABRAS INTERROGATIVAS

Question words AKA PALABRAS INTERROGATIVAS
Saber and Conocer Both verbs mean “to know” Both are regular verbs, except in the “yo” form –Saber: Yo sé, tú sabes, él sabe, nosotros sabemos, ellos.

Saber and Conocer Both verbs mean “to know” Both are regular verbs, except in the “yo” form –Saber: Yo sé, tú sabes, él sabe, nosotros sabemos, ellos.
Reflexive verbs Los verbos reflexivos Reflexive verbs In this presentation, we are going to look at a special group of verbs called reflexive Let’s start.

Reflexive verbs Los verbos reflexivos Reflexive verbs In this presentation, we are going to look at a special group of verbs called reflexive Let’s start.
Comparatives. What is it? Oddly enough, we use comparatives to compare two things. So far, we’ve learned how to compare things using the phrase “más ….

Comparatives. What is it? Oddly enough, we use comparatives to compare two things. So far, we’ve learned how to compare things using the phrase “más ….
Conjugating AR verbs What is an –AR verb?. First, let’s talk about verbs… What is an infinitive? The basic form of a verb Means “to do something” Has.

Conjugating AR verbs What is an –AR verb?. First, let’s talk about verbs… What is an infinitive? The basic form of a verb Means “to do something” Has.
Conditional Mood of Regular Verbs. The conditional mood of regular verbs is very easy because it is the same set of endings as the imperfect or –er and.

Conditional Mood of Regular Verbs. The conditional mood of regular verbs is very easy because it is the same set of endings as the imperfect or –er and.
POR QUÉ VS. PORQUE. ¿Por qué? = Why? *Note the accent on the letter e. * Also note that it is two separate words.

POR QUÉ VS. PORQUE. ¿Por qué? = Why? *Note the accent on the letter e. * Also note that it is two separate words.
Wilfredo Morawa David Guerrero Jorge Singer. Por and Para In spanish, there are two ways of expressing “for”. There is por. And there is para.

Wilfredo Morawa David Guerrero Jorge Singer. Por and Para In spanish, there are two ways of expressing “for”. There is por. And there is para.
 Saber and Conocer both mean TO KNOW but they are used differently.  First lets look at the conjugations…  Both verbs are irregular in the YO form.

 Saber and Conocer both mean TO KNOW but they are used differently.  First lets look at the conjugations…  Both verbs are irregular in the YO form.
Negative Commands of Regular Verbs. Forming negative formal commands of regular verbs is fairly simple. Write the formal (Ud.) form command of the verb,

Negative Commands of Regular Verbs. Forming negative formal commands of regular verbs is fairly simple. Write the formal (Ud.) form command of the verb,
-AR Verbs In Spanish, there are three classes (or conjugations) of verbs: those that end in –AR, those that end in –ER, and those that end in –IR. This.

-AR Verbs In Spanish, there are three classes (or conjugations) of verbs: those that end in –AR, those that end in –ER, and those that end in –IR. This.
How to Conjugate Regular –AR Verbs in the Present Tense.

How to Conjugate Regular –AR Verbs in the Present Tense.
How to Conjugate Regular –AR – Er - IR Verbs in the Present Tense.

How to Conjugate Regular –AR – Er - IR Verbs in the Present Tense.
La hora. The traditional way to tell time in Spanish is by dividing the clock in half. The right side uses “y” to add minutes to the hour. Once the minute.

La hora. The traditional way to tell time in Spanish is by dividing the clock in half. The right side uses “y” to add minutes to the hour. Once the minute.
Los mandatos. Cómo formar los mandatos Use commands when you want to tell someone to do something or not to do something.

Los mandatos. Cómo formar los mandatos Use commands when you want to tell someone to do something or not to do something.

Presentaciones similares

Anuncios Google