Within a dataframe, paired numeric fields that use a "_lo" and
"_hi" suffix naming convention (e.g., "conc_lo" "conc_hi") are combined
into a single Surv object (e.g., "conc") using the "interval2" option
provided by through the survival::Surv(conc_lo, conc_hi, type =
"interval2") syntax.
makeSurvDF(df, suf_lo = "_lo", suf_hi = "_hi")name of data frame
Column name suffix for "lo" values. Default = "_lo"
Column name suffix for "hi" values. Default = "_hi"
dataframe with Surv fields
Converting fields to Surv objects works with field pairs that have a "_lo" and "_hi" suffix naming convention. The numeric value for "_hi" must be greater than or equal to the "_lo" value. Source data that violate this requirement are set to NA with a summary report outputted to the console.
The user can specify their own values for the lo/hi suffixes or use the defaults.
df <- dataCensored[1:20,]
colnames(df)
#> [1] "station" "date" "layer" "secchi" "salinity" "do"
#> [7] "wtemp" "tss" "chla" "din" "nh4" "no23"
#> [13] "po4" "tdn" "tdp" "tn" "tp"
df1 <- unSurvDF(df)
colnames(df1)
#> [1] "station" "date" "layer" "secchi" "salinity" "do"
#> [7] "wtemp" "tss" "chla_lo" "chla_hi" "din_lo" "din_hi"
#> [13] "nh4_lo" "nh4_hi" "no23_lo" "no23_hi" "po4_lo" "po4_hi"
#> [19] "tdn_lo" "tdn_hi" "tdp_lo" "tdp_hi" "tn_lo" "tn_hi"
#> [25] "tp_lo" "tp_hi"
# Default values
df2 <- makeSurvDF(df1)
colnames(df2)
#> [1] "station" "date" "layer" "secchi" "salinity" "do"
#> [7] "wtemp" "tss" "chla" "din" "nh4" "no23"
#> [13] "po4" "tdn" "tdp" "tn" "tp"
# User values
df3 <- unSurvDF(df, "_LOW", "_HIGH")
colnames(df3)
#> [1] "station" "date" "layer" "secchi" "salinity" "do"
#> [7] "wtemp" "tss" "chla_LOW" "chla_HIGH" "din_LOW" "din_HIGH"
#> [13] "nh4_LOW" "nh4_HIGH" "no23_LOW" "no23_HIGH" "po4_LOW" "po4_HIGH"
#> [19] "tdn_LOW" "tdn_HIGH" "tdp_LOW" "tdp_HIGH" "tn_LOW" "tn_HIGH"
#> [25] "tp_LOW" "tp_HIGH"
df4 <- makeSurvDF(df3, "_LOW", "_HIGH")
colnames(df4)
#> [1] "station" "date" "layer" "secchi" "salinity" "do"
#> [7] "wtemp" "tss" "chla" "din" "nh4" "no23"
#> [13] "po4" "tdn" "tdp" "tn" "tp"