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**Computed measure: Percent fair to poor health** Label frqmentd=”Percent with frequent mental distress” * Derived measure: Percent with frequent mental distress Label unhealth=”# Unhealthy days in past 30 days” Then unhealth=min(30,sum(physhlth,menthlth)) Īrray qoldays physhlth menthlth poorhlth * then change (impute) the number of recent activity limitation days to zero days. * if the number of recent activity limitation days is missing (skip pattern), * if the number of mental health days not good equals zero, and * If the number of physical health days not good equals zero, and * Convert values of 88 to zero and out-of-range values to missing. Physically and mentally unhealthy days and recent activity limitation days Label fairpoor=”Percent fair->poor self-rated health” (including the derived measure of percent fair->poor self-rated health) Unhealthy days (sum of physically and mentally unhealthy days not to exceed 30 days).Self-rated health (including the derived measure of the percent of persons with fair to poor self-rated health).In SQL, If Else statement is defined in CASE WHEN.Below are SAS, SPSS, and SUDAAN syntax to appropriately recode and/or create the following Healthy Days variables: We can write SQL query in R using sqldf package. In this case, first element 1 is divided by 2. The %% symbol returns remainder after a value is divided by divisor.
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If_else(x%%2=0, "Multiple of 2", "Not a multiple of 2", "Missing") The following program checks whether a value is a multiple of 2 If_else(condition, value if condition is true, value if condition is false, value if NA) In other words, it is used when we need to perform various actions based on a condition. This style of writing If Else is mostly used when we use conditional statements in loop and R functions. There is one more way to define if.else statement in R. In this example, we can counting the number of records where the condition meets. The | symbol is used to perform OR conditions The & symbol is used to perform AND conditions The is.na() function tests whether a value is NA or not. Aggregate or Summary Functions and IF ELSE Statement.