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POEntering variables into regression function
 

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  1. POEntering variables into regression function
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    <p>I have this feature_list that contains several possible values, say "A", "B", "C" etc. And there is time in time_list.</p> <p>So I will have a loop where I will want to go through each of these different values and put it in a formula.</p> <p>something like <code>for(i in ...)</code> and then <code>my_feature &lt;- feature_list[i]</code> and <code>my_time &lt;- time_list[i]</code>.</p> <p>Then I put the time and the chosen feature to a dataframe to be used for regression</p> <pre><code>feature_list&lt;- c("GPRS") time_list&lt;-c("time") calc&lt;-0 feature_dim &lt;- length(feature_list) time_dim &lt;- length(time_list) data &lt;- read.csv("data.csv", header = TRUE, sep = ";") result &lt;- matrix(nrow=0, ncol=5) errors&lt;-matrix(nrow=0, ncol=3) for(i in 1:feature_dim) { my_feature &lt;- feature_list[i] my_time &lt;- time_list[i] fitdata &lt;- data.frame(data[my_feature], data[my_time]) for(j in 1:60) { my_b &lt;- 0.0001 * (2^j) for(k in 1:60) { my_c &lt;- 0.0001 * (2^k) cat("Feature: ", my_feature, "\t") cat("b: ", my_b, "\t") cat("c: ", my_c, "\n") err &lt;- try(nlsfit &lt;- nls(GPRS ~ 53E5*exp(-1*b*exp(-1*c*time)), data=fitdata, start=list(b=my_b, c=my_c)), silent=TRUE) calc&lt;-calc+1 if(class(err) == "try-error") { next } else { coefs&lt;-coef(nlsfit) ess&lt;-deviance(nlsfit) result&lt;-rbind(result, c(coefs[1], coefs[2], ess, my_b, my_c)) } } } } </code></pre> <p>Now in the <code>nls()</code> call I want to be able to call my_feature instead of just "A" or "B" or something and then to the next one on the list. But I get an error there. What am I doing wrong?</p>
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    1. CO1. It be helpful if you tell what error you get (maybe copy-paste error message?) 2. There is misspell in your code: `data` and `start` argument aren't passed to `nls` (brace is close too soon)
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    2. COyeah the code isn't exact as I was just illustrating the problem. Which is that, I cannot use the my_feature variable inside the nls call but can only have put "A" in the formula.
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    3. COi have put the exact formula now
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