hi, i'm just starting to study r studio, could any of you help in interpreting results after function stargazer.What do asterisks and f test mean?
Hi, and welcome!
For future reference, see FAQ: What's a reproducible example (`reprex`) and how do I do one? It's often essential to getting good answers.
Let's use one from the
ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group <- gl(2, 10, 20, labels = c("Ctl","Trt")) weight <- c(ctl, trt) ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14) trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69) group <- gl(2, 10, 20, labels = c("Ctl","Trt")) weight <- c(ctl, trt) lm.D90 <- lm(weight ~ group - 1) # omitting intercept summary(lm.D90) #> #> Call: #> lm(formula = weight ~ group - 1) #> #> Residuals: #> Min 1Q Median 3Q Max #> -1.0710 -0.4938 0.0685 0.2462 1.3690 #> #> Coefficients: #> Estimate Std. Error t value Pr(>|t|) #> groupCtl 5.0320 0.2202 22.85 9.55e-15 *** #> groupTrt 4.6610 0.2202 21.16 3.62e-14 *** #> --- #> Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 #> #> Residual standard error: 0.6964 on 18 degrees of freedom #> Multiple R-squared: 0.9818, Adjusted R-squared: 0.9798 #> F-statistic: 485.1 on 2 and 18 DF, p-value: < 2.2e-16
Created on 2020-01-26 by the reprex package (v0.3.0)
Before running a regression, you should decide on \alpha, of the level of statistical significance. \alpha = 0.05 is conventional, and it means that the result has a 1 in 20 chance of being due to random variation.
The first thing to look at is the overall model results is the
F statistic, it's
p-value should be less than \alpha. In this case it is. If it isn't, the model
The stars are the p-values of the coefficients
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
But that's not the end of it. There are also diagnostic plots
For a longer discussion see my short introduction to OLS
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