With the following data, I am trying to calculate the Chi Square and Bonferroni lower and upper Confidence intervals. The column "Data_No" identifies the dataset (as calculations needs to be done separately for each dataset).
Data_No Area Observed
1 3353 31
1 2297 2
1 1590 15
1 1087 16
1 817 2
1 847 10
1 1014 28
1 872 29
1 1026 29
1 1215 21
2 3353 31
2 2297 2
2 1590 15
3 1087 16
3 817 2
The code I used is
library(dplyr)
setwd("F:/GIS/July 2019/")
total_data <- read.csv("test.csv")
result_data <- NULL
for(i in unique(total_data$Data_No)){
data <- total_data[which(total_data$Data_No == i),] data <- data %>%
mutate(RelativeArea = Area/sum(Area), Expected = RelativeArea*sum(Observed), OminusE = Observed-Expected, O2 = OminusE^2, O2divE = O2/Expected, APU = Observed/sum(Observed), Alpha = 0.05/2*count(Data_No),
Zvalue = qnorm(Alpha,lower.tail=FALSE), lower = APU-Zvalue*sqrt(APU*(1-APU)/sum(Observed)), upper = APU+Zvalue*sqrt(APU*(1-APU)/sum(Observed)))
result_data <- rbind(result_data,data) }
write.csv(result_data,file='final_result.csv')
And the error message I get is:
Error in UseMethod("summarise_") : no applicable method for 'summarise_' applied to an object of class "c('integer', 'numeric')"
The column that I am calling "Alpha" is the alpha value of 0.05/2k, where K is the number of categories - in my example, I have 10 categories ("Data_No" column) for the first dataset, so "Alpha" needs to be 0.05/20 = 0.0025, and it's corresponding Z value is 2.807. The second dataset has 3 categories (so 0.05/6) and the third has 2 categories (0.05/4) in my example table (Data_No" column). Using the values from the newly calculated "Alpha" column, I then need to calculate the ZValue column (Zvalue = qnorm(Alpha,lower.tail=FALSE)) which I then use to calculate the lower and upper confidence intervals.
From the above data, here are the results that I should get, but note that I have had to manually calculate Alpha column and Zvalue, rather than insert those calculations within the R code:
Data_No Area Observed RelativeArea Alpha Z value lower upper
1 3353 31 0.237 0.003 2.807 0.092 0.247
1 2297 2 0.163 0.003 2.807 -0.011 0.033
1 1590 15 0.113 0.003 2.807 0.025 0.139
1 1087 16 0.077 0.003 2.807 0.029 0.146
1 817 2 0.058 0.003 2.807 -0.011 0.033
1 847 10 0.060 0.003 2.807 0.007 0.102
1 1014 28 0.072 0.003 2.807 0.078 0.228
1 872 29 0.062 0.003 2.807 0.083 0.234
1 1026 29 0.073 0.003 2.807 0.083 0.234
1 1215 21 0.086 0.003 2.807 0.049 0.181
2 3353 31 0.463 0.008 2.394 0.481 0.811
2 2297 2 0.317 0.008 2.394 -0.027 0.111
2 1590 15 0.220 0.008 2.394 0.152 0.473
3 1087 16 0.571 0.013 2.241 0.723 1.055
3 817 2 0.429 0.013 2.241 -0.055 0.277
Please note that I only included some of the columns generated from the code.
# You need to check the closing bracket for lower c.f. sqrt value. Following code should work.
data <- read.csv("test.csv")
data <- data %>% mutate(RelativeArea =
Area/sum(Area), Expected = RelativeArea*sum(Observed), OminusE =
Observed-Expected, O2 = OminusE^2, O2divE = O2/Expected, APU =
Observed/sum(Observed), lower =
APU-2.394*sqrt(APU*(1-APU)/sum(Observed)), upper =
APU+2.394*sqrt(APU*(1-APU)/sum(Observed)))
#Answer to follow-up question.
#Sample Data
Data_No Area Observed
1 3353 31
1 2297 2
2 1590 15
2 1087 16
#Code to run
total_data <- read.csv("test.csv")
result_data <- NULL
for(i in unique(total_data$Data_No)){
data <- total_data[which(total_data$Data_No == i),]
data <- data %>% mutate(RelativeArea =
Area/sum(Area), Expected = RelativeArea*sum(Observed), OminusE =
Observed-Expected, O2 = OminusE^2, O2divE = O2/Expected, APU =
Observed/sum(Observed), lower =
APU-2.394*sqrt(APU*(1-APU)/sum(Observed)), upper =
APU+2.394*sqrt(APU*(1-APU)/sum(Observed)))
result_data <- rbind(result_data,data)
}
write.csv(result_data,file='final_result.csv')