Calculate m-index (m-quotient)

Computes the m-index (m-quotient) for entities at the specified level. The m-index equals the h-index divided by the number of years since the entity's first publication (Hirsch, 2005).

Usage

sm_metric_m_index(
  corpus,
  level = c("author", "institution", "source", "country"),
  self_corrected = FALSE,
  call = rlang::caller_env()
)

Arguments

corpus

An sm_corpus object.

level

Character; the entity level. Defaults to "author".

self_corrected

Logical (default FALSE); remove self-citations (sm_self_citation()) before computing the index. Author/institution only.

call

Caller environment for error reporting.

Value

A tibble with columns for the entity ID/name, h_index, first_year, career_years, and m_index.

See also

sm_self_citation()

Other metrics: sm_metric_collab_index(), sm_metric_disruption(), sm_metric_fnci(), sm_metric_g_index(), sm_metric_h_index(), sm_metric_novelty(), sm_metric_rcr(), sm_self_citation(), sm_summary_authors(), sm_summary_period(), sm_summary_sources(), sm_summary_works()

Examples

corpus <- sm_example_corpus()
sm_metric_m_index(corpus, level = "author")
#> # A tibble: 80 × 5
#>    author_id  h_index first_year career_years m_index
#>    <chr>        <int>      <int>        <int>   <dbl>
#>  1 A000000001      14       2015           11   1.27 
#>  2 A000000032      11       2016           10   1.1  
#>  3 A000000042      11       2016           10   1.1  
#>  4 A000000013      10       2016           10   1    
#>  5 A000000074       9       2017            9   1    
#>  6 A000000038      10       2015           11   0.909
#>  7 A000000022       9       2016           10   0.9  
#>  8 A000000021       8       2017            9   0.889
#>  9 A000000015       9       2015           11   0.818
#> 10 A000000020       9       2015           11   0.818
#> # ℹ 70 more rows