Using CASE or IF Statement in Power BI - if-statement

Question

I want to get a percentage of White people separate while the rest of the races will be People of color in a project am currently working in. Please I need help how to write the DAX either using CASE or IF statement.
I used SWITCH and it gave error
Race_Ethnicity =
SWITCH(TRUE(),
'Contact'[race_and_ethnicity] = "White or European", "White or European",
'Contact'[race_and_ethnicity] = "Black or African", "Black or African",
'Contact'[race_and_ethnicity] = "Hispanic or Latinx", "Hispanic or Latinx",
'Contact'[race_and_ethnicity] = "Prefer not to answer", "Prefer not to answer",
'Contact'[race_and_ethnicity] = "South Asian", "South Asian",
'Contact'[race_and_ethnicity] = "East Asian", "East Asian",
'Contact'[race_and_ethnicity] = "Middle Eastern", "Middle Eastern",
'Contact'[race_and_ethnicity] = "Southeast Asian", "Southeast Asian",
'Contact'[race_and_ethnicity] = "Pacific Islander", "Pacific Islander",
'Contact'[race_and_ethnicity] = "Indigenous","Indigenous",
'Contact'[race_and_ethnicity] = "Other, please specify:", "Other, please specify:",
'Contact'[race_and_ethnicity] = ".*(;).*", "Mixed Race or Ethnicity",
)
I am expecting to have the percentage of White or European and the percentage of People of color

Answer 1

When doing something akin to SUMIF in Power BI, we need to invoke CALCULATE. This function allows you to set filters that should be followed for parts of the calculation wrapped in CALCULATE.
Here are two measures. One for percentage of whites/europeans:
WOE % =
VAR _count =
CALCULATE (
COUNTROWS ( 'Contact' ) ,
'Contact'[race_and_ethnicity] = "White or European"
)
RETURN
DIVIDE (
_count ,
COUNTROWS ( 'Contact' )
)
And one for the opposite:
POC % =
VAR _count =
CALCULATE (
COUNTROWS ( 'Contact' ) ,
'Contact'[race_and_ethnicity] <> "White or European"
)
RETURN
DIVIDE (
_count ,
COUNTROWS ( 'Contact' )
)