Visualisation avec des nuages de points

Analyse de données d'enquête avec R

Kelly McConville

Assistant Professor of Statistics

babies <- filter(NHANESraw, AgeMonths <= 6) %>%
  select(AgeMonths, HeadCirc)
babies

# A tibble: 484 x 2
   AgeMonths HeadCirc
       <int>    <dbl>
 1         3     42.7
 2         4     42.8
 3         2     38.8
 4         0     36.0
 5         5     42.7
 6         2     41.9
 7         6     44.3
 8         3     42.0
 9         2     41.3
10         1     38.9
# ... with 474 more rows

Nuages de points

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc)) + 
  geom_point()

Nuage de points : âge vs tour de tête

Gigue (jitter)

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc)) + 
  geom_jitter(width = 0.3, height = 0)

Nuage de points avec gigue : âge vs tour de tête

babies <- filter(NHANESraw, AgeMonths <= 6) %>%
  select(AgeMonths, HeadCirc, WTMEC4YR)
babies

# A tibble: 484 x 3
   AgeMonths HeadCirc WTMEC4YR
       <int>    <dbl>    <dbl>
 1         3     42.7    12915
 2         4     42.8    12791
 3         2     38.8     2359
 4         0     36.0     4306
 5         5     42.7     2922
 6         2     41.9     5561
 7         6     44.3    10416
 8         3     42.0     9957
 9         2     41.3     4503
10         1     38.9     3718
# ... with 474 more rows

Nuages de bulles

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc,
                                    size = WTMEC4YR)) + 
  geom_jitter(width = 0.3, height = 0) + 
  guides(size = "none")

Nuage de bulles : âge vs tour de tête

Nuages de bulles

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc,
                                    size = WTMEC4YR)) + 
  geom_jitter(width = 0.3, height = 0, alpha = 0.3) + 
  guides(size = "none")

Nuage de bulles semi-transparent : âge vs tour de tête

Nuages de points pondérés par sondage

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc,
                                    color = WTMEC4YR)) + 
  geom_jitter(width = 0.3, height = 0) + 
  guides(color = "none")

Nuage de points : âge vs tour de tête, couleur = poids

Nuages de points pondérés par sondage

ggplot(data = babies, mapping = aes(x = AgeMonths, y = HeadCirc,
                                    alpha = WTMEC4YR)) + 
  geom_jitter(width = 0.3, height = 0) + 
  guides(alpha = "none")

Nuage de points : âge vs tour de tête, transparence = poids

Passons à la pratique !

Analyse de données d'enquête avec R