You can subset studies by identifier or by position using the
`[` operator.
Usage
# S4 method for studies,missing,missing,missing
[(x, i, j, ..., drop = FALSE)
# S4 method for studies,numeric,missing,missing
[(x, i, j, ..., drop = FALSE)
# S4 method for studies,character,missing,missing
[(x, i, j, ..., drop = FALSE)Arguments
- x
A studies object.
- i
Position of the identifier or the name of the identifier itself.
- j
Not used.
- ...
Additional arguments not used here.
- drop
Not used.
Value
A studies object.
Examples
# Subset a studies object by identifier
studies_ex01['GCST001585']
#> An object of class "studies"
#> Slot "studies":
#> # A tibble: 1 × 13
#> study_id reported_trait initial_sample_size replication_sample_s…¹ gxe gxg
#> <chr> <chr> <chr> <chr> <lgl> <lgl>
#> 1 GCST001… Breast size 16,175 European an… NA FALSE FALSE
#> # ℹ abbreviated name: ¹replication_sample_size
#> # ℹ 7 more variables: snp_count <int>, qualifier <chr>, imputed <lgl>,
#> # pooled <lgl>, study_design_comment <chr>, full_pvalue_set <lgl>,
#> # user_requested <lgl>
#>
#> Slot "genotyping_techs":
#> # A tibble: 1 × 2
#> study_id genotyping_technology
#> <chr> <chr>
#> 1 GCST001585 Genome-wide genotyping array
#>
#> Slot "platforms":
#> # A tibble: 1 × 2
#> study_id manufacturer
#> <chr> <chr>
#> 1 GCST001585 Illumina
#>
#> Slot "ancestries":
#> # A tibble: 1 × 4
#> study_id ancestry_id type number_of_individuals
#> <chr> <int> <chr> <int>
#> 1 GCST001585 1 initial 16175
#>
#> Slot "ancestral_groups":
#> # A tibble: 1 × 3
#> study_id ancestry_id ancestral_group
#> <chr> <int> <chr>
#> 1 GCST001585 1 European
#>
#> Slot "countries_of_origin":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST001585 1 NA NA NA
#>
#> Slot "countries_of_recruitment":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST001585 1 NA NA NA
#>
#> Slot "publications":
#> # A tibble: 1 × 7
#> study_id pubmed_id publication_date publication title author_fullname
#> <chr> <int> <date> <chr> <chr> <chr>
#> 1 GCST001585 22747683 2012-06-29 BMC Med Genet Genetic v… Eriksson N
#> # ℹ 1 more variable: author_orcid <chr>
#>
# Or by its position in table studies
studies_ex01[1]
#> An object of class "studies"
#> Slot "studies":
#> # A tibble: 1 × 13
#> study_id reported_trait initial_sample_size replication_sample_s…¹ gxe gxg
#> <chr> <chr> <chr> <chr> <lgl> <lgl>
#> 1 GCST001… Breast size 16,175 European an… NA FALSE FALSE
#> # ℹ abbreviated name: ¹replication_sample_size
#> # ℹ 7 more variables: snp_count <int>, qualifier <chr>, imputed <lgl>,
#> # pooled <lgl>, study_design_comment <chr>, full_pvalue_set <lgl>,
#> # user_requested <lgl>
#>
#> Slot "genotyping_techs":
#> # A tibble: 1 × 2
#> study_id genotyping_technology
#> <chr> <chr>
#> 1 GCST001585 Genome-wide genotyping array
#>
#> Slot "platforms":
#> # A tibble: 1 × 2
#> study_id manufacturer
#> <chr> <chr>
#> 1 GCST001585 Illumina
#>
#> Slot "ancestries":
#> # A tibble: 1 × 4
#> study_id ancestry_id type number_of_individuals
#> <chr> <int> <chr> <int>
#> 1 GCST001585 1 initial 16175
#>
#> Slot "ancestral_groups":
#> # A tibble: 1 × 3
#> study_id ancestry_id ancestral_group
#> <chr> <int> <chr>
#> 1 GCST001585 1 European
#>
#> Slot "countries_of_origin":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST001585 1 NA NA NA
#>
#> Slot "countries_of_recruitment":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST001585 1 NA NA NA
#>
#> Slot "publications":
#> # A tibble: 1 × 7
#> study_id pubmed_id publication_date publication title author_fullname
#> <chr> <int> <date> <chr> <chr> <chr>
#> 1 GCST001585 22747683 2012-06-29 BMC Med Genet Genetic v… Eriksson N
#> # ℹ 1 more variable: author_orcid <chr>
#>
# Keep all studies except the first
studies_ex01[-1]
#> An object of class "studies"
#> Slot "studies":
#> # A tibble: 1 × 13
#> study_id reported_trait initial_sample_size replication_sample_s…¹ gxe gxg
#> <chr> <chr> <chr> <chr> <lgl> <lgl>
#> 1 GCST003… Breast size 33,790 European an… NA FALSE FALSE
#> # ℹ abbreviated name: ¹replication_sample_size
#> # ℹ 7 more variables: snp_count <int>, qualifier <chr>, imputed <lgl>,
#> # pooled <lgl>, study_design_comment <chr>, full_pvalue_set <lgl>,
#> # user_requested <lgl>
#>
#> Slot "genotyping_techs":
#> # A tibble: 1 × 2
#> study_id genotyping_technology
#> <chr> <chr>
#> 1 GCST003985 Genome-wide genotyping array
#>
#> Slot "platforms":
#> # A tibble: 1 × 2
#> study_id manufacturer
#> <chr> <chr>
#> 1 GCST003985 Illumina
#>
#> Slot "ancestries":
#> # A tibble: 1 × 4
#> study_id ancestry_id type number_of_individuals
#> <chr> <int> <chr> <int>
#> 1 GCST003985 1 initial 33790
#>
#> Slot "ancestral_groups":
#> # A tibble: 1 × 3
#> study_id ancestry_id ancestral_group
#> <chr> <int> <chr>
#> 1 GCST003985 1 European
#>
#> Slot "countries_of_origin":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST003985 1 NA NA NA
#>
#> Slot "countries_of_recruitment":
#> # A tibble: 1 × 5
#> study_id ancestry_id country_name major_area region
#> <chr> <int> <chr> <chr> <chr>
#> 1 GCST003985 1 NA NA NA
#>
#> Slot "publications":
#> # A tibble: 1 × 7
#> study_id pubmed_id publication_date publication title author_fullname
#> <chr> <int> <date> <chr> <chr> <chr>
#> 1 GCST003985 27182965 2016-05-15 Nat Genet Detection a… Pickrell JK
#> # ℹ 1 more variable: author_orcid <chr>
#>