# essayreg2: Linear Regression (Cloze with Essay and File Upload)

Exercise template for interpreting a regression with two explanatory variables based on randomly-generated data (with either a linear, semi-logarithmic, or log-log relationship) in form of a cloze including essay and file upload.

**Name:**

`essayreg2`

**Type:**

**Related:**

**Description:**

The results of a linear regression model (linear, semi-logarithmic, or log-log) need to be obtained and interpreted in a "cloze" question. This comprises two "num" elements (R-squared and F-statistic), an open-ended "essay" element for interpreting the model output, and a "file" upload for the R script used by the participants. This type of extended cloze question is currently supported in QTI 2.1 (OpenOlat in particular).

**Solution feedback:**

Yes

**Randomization:**

Random numbers and text blocks

**Mathematical notation:**

No

**Verbatim R input/output:**

Yes

**Images:**

No

**Other supplements:**

regression.csv

**Demo code:**

```
library("exams")
set.seed(403)
exams2html("essayreg2.Rmd")
set.seed(403)
exams2pdf("essayreg2.Rmd")
set.seed(403)
exams2html("essayreg2.Rnw")
set.seed(403)
exams2pdf("essayreg2.Rnw")
```