R programming: drc package error

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I'm a new bee to R programming. My problem is, how do I get the standard deviations for each concentration (0,1,5,10,15,20 mg/L) to get displayed on the plot?

Here's my code:

    72 timer LC50
> LC50_72hR<-read.csv(file.choose(),dec=".",sep=" ", header=TRUE)
> LC50_72hR
   Concentration Total Dead
1              0    20    1
2              0    20    1
3              0    20    1
4              1    20    4
5              1    20    2
6              1    20    5
7              5    20    7
8              5    20   11
9              5    20   10
10            10    20   11
11            10    20   16
12            10    20   15
13            15    20   16
14            15    20   18
15            15    20   20
16            20    20   19
17            20    20   20
18            20    20   20
> LC50_72hR<-drm(Dead/Total~Concentration,weights=Total,fct=LL.2(),type="binomial",data=LC50_72hR)
> summary(LC50_72hR)

Model fitted: Log-logistic (ED50 as parameter) with lower limit at 0 and upper limit at 1 (2 parms)

Parameter estimates:

              Estimate Std. Error  t-value p-value
b:(Intercept) -1.40548    0.16443 -8.54734       0
e:(Intercept)  4.09353    0.49499  8.26987       0
> plot(LC50_72hR)
> ED(LC50_72hR,c(10,50,90))

Estimated effective doses

     Estimate Std. Error
1:10  0.85734     0.2242
1:50  4.09353     0.4950
1:90 19.54538     3.2559

How do I put std dev on my plot?

Apr 5, 2019 in Data Analytics by Tyrion anex
• 8,370 points
123 views

1 answer to this question.

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You need two variables, (x and y). In the regression, you divided dead/total means this is one variable (x) and you have another variable for concentration. This way you can easily plot the SD on your data.

answered Apr 5, 2019 by Sophie may
• 9,940 points

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