Please i want to draw pps sample from different zones. Every zone has its sample size. I have 2 data frames in rstudio.
The first one contains the whole individuals, each individual belongs to a zone with a size variable.
The second data frame contains sample size of each zone.
**First data frame (BD) :
| Individuals | Zone | size_variable |
|---|---|---|
| 1 | A | 3 |
| 2 | B | 8 |
| 3 | A | 2 |
| 4 | E | 14 |
| …… | ……. | ……. |
**Second data frame (SZ) :
| Zone | Sample Size |
|---|---|
| A | 4 |
| B | 6 |
| C | 7 |
| D | 10 |
| …… | ……. |
I turned the following code :
library(samplingbook)
library(dplyr)
library(readxl)
for (i in 1:nrow(SZ)) { for (j in 1:nrow(SZ)){ i=BD%>%filter(Zone==SZ$Zone [i]) sample [[i]] <- pps.sampling(i$size_variable,SZ$sample_size[j],id=BD$Individuals,method = 'midzuno', return.PI = FALSE ) Sample_Final [[i]] <- data.frame(sample[[i]]$sample) Write.csv (Sample_Final [[i]], "sample.csv")
But i had only one sample of the first zone. please help me where is the problem?
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