Filter helpers

Introduction

Dealing with an object can be difficult to handle specially when we are trying to filter. For example, difficult tasks would be to filter to a certain result_type or when there are many strata joined together filter only one of the variables. On the other hand it exists the tidy format that makes it easy to filter, but then you loose the object. There exist some functions that only work with objects.

visOmopResults package contains some functionalities that helps on this process:

• filterSettings to filter the object using the settings() attribute.
• filterGroup to filter the object using the group_name-group_level tidy columns.
• filterStrata to filter the object using the strata_name-starta_level tidy columns.
• filterAdditional to filter the object using the additional_name-additional_level tidy columns.

In this vignette we will also cover two types of utility functions:

• unite* type functions: to join multiple columns in the name-level structure.
• *Columns type functions: to identify the columns that are contained in a name-level structure.

Now we will see some examples.

filterSettings

For this example we will use some mock data.

library(visOmopResults)
library(dplyr, warn.conflicts = FALSE)

Let’s generate two sets of results:

result1 <- mockSummarisedResult()
result2 <- mockSummarisedResult()

We can change the settings of the second set of results simulating that results come from a different package ans set of results:

result2 <- result2 |>
  omopgenerics::newSummarisedResult(settings = tibble(
    result_id = 1L,
    result_type = "second_mock_result",
    package_name = "omopgenerics",
    package_version = "1.0.0",
    my_parameter = TRUE
  ))

We can now merge both results in a unique object:

result <- bind(result1, result2)
settings(result)
#> # A tibble: 2 × 5
#>   result_id result_type            package_name   package_version my_parameter
#>       <int> <chr>                  <chr>          <chr>           <lgl>       
#> 1         1 mock_summarised_result visOmopResults 0.4.1           NA          
#> 2         2 second_mock_result     omopgenerics   1.0.0           TRUE
result
#> # A tibble: 252 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         1 mock     cohort_name cohort1     overall           overall        
#>  2         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Male   
#>  3         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Male  
#>  4         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  5         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  6         1 mock     cohort_name cohort1     sex               Male           
#>  7         1 mock     cohort_name cohort1     sex               Female         
#>  8         1 mock     cohort_name cohort1     age_group         <40            
#>  9         1 mock     cohort_name cohort1     age_group         >=40           
#> 10         1 mock     cohort_name cohort2     overall           overall        
#> # ℹ 242 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>

You could potentially add the settings with addSettings(), then filter and finally eliminate the columns. Let’s see an example where we subset to the results that have my_parameter == TRUE:

resultMyParam <- result |>
  addSettings(settingsColumns = "my_parameter") |>
  filter(my_parameter == TRUE) |>
  select(!"my_parameter")
resultMyParam
#> # A tibble: 126 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         2 mock     cohort_name cohort1     overall           overall        
#>  2         2 mock     cohort_name cohort1     age_group &&& sex <40 &&& Male   
#>  3         2 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Male  
#>  4         2 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  5         2 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  6         2 mock     cohort_name cohort1     sex               Male           
#>  7         2 mock     cohort_name cohort1     sex               Female         
#>  8         2 mock     cohort_name cohort1     age_group         <40            
#>  9         2 mock     cohort_name cohort1     age_group         >=40           
#> 10         2 mock     cohort_name cohort2     overall           overall        
#> # ℹ 116 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>

This approach has some problems:

• It is not efficient.
• We have to use three different functions.
• The settings attribute still contains both sets:

settings(resultMyParam)
#> # A tibble: 2 × 5
#>   result_id result_type            package_name   package_version my_parameter
#>       <int> <chr>                  <chr>          <chr>           <lgl>       
#> 1         1 mock_summarised_result visOmopResults 0.4.1           NA          
#> 2         2 second_mock_result     omopgenerics   1.0.0           TRUE

We can do the same solving the three problems using filterSettings():

resultMyParam <- result |>
  filterSettings(my_parameter == TRUE)
resultMyParam
#> # A tibble: 126 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         2 mock     cohort_name cohort1     overall           overall        
#>  2         2 mock     cohort_name cohort1     age_group &&& sex <40 &&& Male   
#>  3         2 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Male  
#>  4         2 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  5         2 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  6         2 mock     cohort_name cohort1     sex               Male           
#>  7         2 mock     cohort_name cohort1     sex               Female         
#>  8         2 mock     cohort_name cohort1     age_group         <40            
#>  9         2 mock     cohort_name cohort1     age_group         >=40           
#> 10         2 mock     cohort_name cohort2     overall           overall        
#> # ℹ 116 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>
settings(resultMyParam)
#> # A tibble: 1 × 5
#>   result_id result_type        package_name package_version my_parameter
#>       <int> <chr>              <chr>        <chr>           <lgl>       
#> 1         2 second_mock_result omopgenerics 1.0.0           TRUE

filterStrata

Using the same mock data we can try to filter the rows that contain data related to ‘Female’, the problematic with the strata_name-strata_level display is that it is difficult to easily filter the “Female” columns:

result |>
  select(strata_name, strata_level) |>
  distinct()
#> # A tibble: 9 × 2
#>   strata_name       strata_level   
#>   <chr>             <chr>          
#> 1 overall           overall        
#> 2 age_group &&& sex <40 &&& Male   
#> 3 age_group &&& sex >=40 &&& Male  
#> 4 age_group &&& sex <40 &&& Female 
#> 5 age_group &&& sex >=40 &&& Female
#> 6 sex               Male           
#> 7 sex               Female         
#> 8 age_group         <40            
#> 9 age_group         >=40

One option that we could use is splitStrata(), filter() and then uniteStrata() again:

result |>
  splitStrata() |>
  filter(sex == "Female") |>
  uniteStrata(c("age_group", "sex"))
#> # A tibble: 84 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  2         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  3         1 mock     cohort_name cohort1     sex               Female         
#>  4         1 mock     cohort_name cohort2     age_group &&& sex <40 &&& Female 
#>  5         1 mock     cohort_name cohort2     age_group &&& sex >=40 &&& Female
#>  6         1 mock     cohort_name cohort2     sex               Female         
#>  7         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  8         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  9         1 mock     cohort_name cohort1     sex               Female         
#> 10         1 mock     cohort_name cohort2     age_group &&& sex <40 &&& Female 
#> # ℹ 74 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>

Problem of this is that:

• It is extremely inefficient (all the rows must be splitted and united back).
• You need to know which are the strata columns (you could potentially use strataColumns()).
• You have to use multiple functions.

We could do exactly the same with the function filterStrata():

result |>
  filterStrata(sex == "Female")
#> # A tibble: 84 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  2         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  3         1 mock     cohort_name cohort1     sex               Female         
#>  4         1 mock     cohort_name cohort2     age_group &&& sex <40 &&& Female 
#>  5         1 mock     cohort_name cohort2     age_group &&& sex >=40 &&& Female
#>  6         1 mock     cohort_name cohort2     sex               Female         
#>  7         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  8         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  9         1 mock     cohort_name cohort1     sex               Female         
#> 10         1 mock     cohort_name cohort2     age_group &&& sex <40 &&& Female 
#> # ℹ 74 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>

filterGroup() and filterAdditional() work exactly in the same way than filterStrata() but with their analogous columns.

A nice functionality that you may have is that is that if you filter by a column/setting that does not exist the output will be warning + return emptySummarisedResult() which can be quite hekpful in some occasions.

result |>
  filterSettings(setting_that_does_not_exist == 1)
#> Warning: ! Variable filtering does not exist, returning empty result:
#> ℹ In argument: `setting_that_does_not_exist == 1`.
#> # A tibble: 0 × 13
#> # ℹ 13 variables: result_id <int>, cdm_name <chr>, group_name <chr>,
#> #   group_level <chr>, strata_name <chr>, strata_level <chr>,
#> #   variable_name <chr>, variable_level <chr>, estimate_name <chr>,
#> #   estimate_type <chr>, estimate_value <chr>, additional_name <chr>,
#> #   additional_level <chr>

unite functions

In this previous section we have mentioned the function uniteStrata() without explaining its functionality so let’s cover it with a couple of examples. The uniteGroup(), uniteStrata() and uniteAdditional() functions are the opposite to the split*() type functions:

result |>
  splitStrata()
#> # A tibble: 252 × 13
#>    result_id cdm_name group_name  group_level age_group sex     variable_name  
#>        <int> <chr>    <chr>       <chr>       <chr>     <chr>   <chr>          
#>  1         1 mock     cohort_name cohort1     overall   overall number subjects
#>  2         1 mock     cohort_name cohort1     <40       Male    number subjects
#>  3         1 mock     cohort_name cohort1     >=40      Male    number subjects
#>  4         1 mock     cohort_name cohort1     <40       Female  number subjects
#>  5         1 mock     cohort_name cohort1     >=40      Female  number subjects
#>  6         1 mock     cohort_name cohort1     overall   Male    number subjects
#>  7         1 mock     cohort_name cohort1     overall   Female  number subjects
#>  8         1 mock     cohort_name cohort1     <40       overall number subjects
#>  9         1 mock     cohort_name cohort1     >=40      overall number subjects
#> 10         1 mock     cohort_name cohort2     overall   overall number subjects
#> # ℹ 242 more rows
#> # ℹ 6 more variables: variable_level <chr>, estimate_name <chr>,
#> #   estimate_type <chr>, estimate_value <chr>, additional_name <chr>,
#> #   additional_level <chr>

result |>
  splitStrata() |>
  uniteStrata(c("age_group", "sex"))
#> # A tibble: 252 × 13
#>    result_id cdm_name group_name  group_level strata_name       strata_level   
#>        <int> <chr>    <chr>       <chr>       <chr>             <chr>          
#>  1         1 mock     cohort_name cohort1     overall           overall        
#>  2         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Male   
#>  3         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Male  
#>  4         1 mock     cohort_name cohort1     age_group &&& sex <40 &&& Female 
#>  5         1 mock     cohort_name cohort1     age_group &&& sex >=40 &&& Female
#>  6         1 mock     cohort_name cohort1     sex               Male           
#>  7         1 mock     cohort_name cohort1     sex               Female         
#>  8         1 mock     cohort_name cohort1     age_group         <40            
#>  9         1 mock     cohort_name cohort1     age_group         >=40           
#> 10         1 mock     cohort_name cohort2     overall           overall        
#> # ℹ 242 more rows
#> # ℹ 7 more variables: variable_name <chr>, variable_level <chr>,
#> #   estimate_name <chr>, estimate_type <chr>, estimate_value <chr>,
#> #   additional_name <chr>, additional_level <chr>

Note that missing will be not included (if all missing: overall-overall will be considered), for example:

age_group	sex	year
NA	NA	NA
NA	Male	NA
<40	Female	2010
>40	NA	2011

With uniteStrata(cols = c("age_group", "sex", "year")) the output would be:

strata_name	strata_level
overall	overall
sex	Male
age_group &&& sex &&& year	<40 &&& Female &&& 2010
age_group &&& year	>40 &&& 2011

Note that is we split again then year will be a character vector instead of an integer. In future releases conserving type may be possible.

uniteGroup() and uniteAdditional() work exactly in the same way than uniteStrata() but with their analogous columns.

Columns

Splitting and tidying your can give you many advantages, as we have seen across the different vignettes. One of the problems that you may face is the ability to know which are the available settings to add, or how many columns will be generated when splitting group. That’s why visOmopResults created some helper functions:

• settingsColumns() gives you the setting names that are available in a object.
• groupColumns() gives you the new columns that will be generated when splitting group_name-group_level pair into different columns.
• strataColumns() gives you the new columns that will be generated when splitting strata_name-strata_level pair into different columns.
• additionalColumns() gives you the new columns that will be generated when splitting additional_name-additional_level pair into different columns.
• tidyColumns() gives you the columns that will have the object if you tidy it (tidy(result)). This function in very useful to know which are the columns that can be included in plot and table functions.

Let’s see the different values with out example mock data set:

settingsColumns(result)
#> [1] "result_type"     "package_name"    "package_version" "my_parameter"
groupColumns(result)
#> [1] "cohort_name"
strataColumns(result)
#> [1] "age_group" "sex"
additionalColumns(result)
#> character(0)
tidyColumns(result)
#>  [1] "cdm_name"        "cohort_name"     "age_group"       "sex"            
#>  [5] "variable_name"   "variable_level"  "count"           "mean"           
#>  [9] "sd"              "percentage"      "result_type"     "package_name"   
#> [13] "package_version" "my_parameter"