makeStrata | R Documentation |
Make and assign strata based on two input attributes and some parameters functions are makeStrata and assignStrata
makeStrata( data, x1 = "PlotStrata1", x2 = "Elev.P95", split_x1 = c("qt", "eq"), split_x2 = c("qt", "eq"), nest_x2 = T, n1 = 10, n2 = 10, type_x1 = c("factor", "numeric")[1], type_x2 = c("numeric", "factor")[1], minRecs = 7, precision = 0, collapse = T )
data |
input data |
x1 |
name of input x field |
x2 |
name of input y field |
split_x1 |
how to split - equal interval or quantile based |
split_x2 |
how to split - equal interval or quantile based |
nest_x2 |
should x2 be nested in x1, or should x1 and x2 be split independently |
n1 |
number of strata for x1 |
n2 |
number of strata for x2 |
type_x1 |
is x1 numeric or factor |
type_x2 |
is x2 numeric or factor |
minRecs |
what is the minimum number of records in a stratum before collapse |
precision |
what precision is retained for cutting numeric values into strata |
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Revision History
1.0 | 2019 01 24 created |
1.1 | 2020 06 25 updated to allow more complex inputs |
makeStrata returns a data.frame of strata boundaries assignStrata takes a data.frame and appends a column with the stratum name for each record
Jacob Strunk <Jstrunk@fs.fed.us>
#prepare pseudo data n=500 hts = sample(1:150,n,T) dbhs = abs(hts/5 + rnorm(#' )*2) dat_test = data.frame(height = hts , dbh = dbhs, height_cat = cut(hts,10) , dbh_cat = cut(dbhs,10)) plot(dbhs,hts) #example 1 factor and numeric str_test = makeStrata( dat_test , x1="height_cat" , x2="dbh" , split_x1 =c("qt","eq")[1] , split_x2 =c("qt","eq")[1] , nest_x2 = T , n1 = 10 , n2 = 10 , type_x1 = "factor" , type_x2 = "numeric" , minRecs = 7 , precision = 0 ) res = assignStrata( str_test ,dat_test ) res$stratum summary(lm(height ~ dbh , data = res)) summary(lm(height ~ dbh_cat , data = res)) summary(lm(height ~ stratum , data = res)) #example 2 numeric and numeric str_test1 = makeStrata( dat_test , x1="height" , x2="dbh" , split_x1 =c("qt","eq")[1] , split_x2 =c("qt","eq")[1] , nest_x2 = T , n1 = 10 , n2 = 10 , type_x1 = "numeric" , type_x2 = "numeric" , minRecs = 7 , precision = 0 ) res1 = assignStrata( str_test1 ,dat_test ) #example 3 numeric and factor str_test2 = makeStrata( dat_test , x1="height" , x2="dbh_cat" , split_x1 =c("qt","eq")[1] , split_x2 =c("qt","eq")[1] , nest_x2 = T , n1 = 10 , n2 = 10 , type_x1 = "numeric" , type_x2 = "factor" , minRecs = 7 , precision = 0 ) res2 = assignStrata( str_test2 ,dat_test )
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