change the words but not change the meanings. Categorical data were expressed as frequencies (percentages) and compared using the chi-square test
时间: 2023-05-22 09:03:36 浏览: 57
Answer: The chi-square test was used to compare frequencies (percentages) of categorical data, while maintaining the same meaning but changing the wording.
相关问题
what is the difference of "+" symbol and "force" command in makefile?
In a Makefile, the "+" symbol and the "force" command have different meanings.
The "+" symbol is used to indicate that a command must be executed, even if the "-n" or "--just-print" option is used. This is called a forced execution. For example:
```
target:
+echo "This command will always be executed"
```
If you run `make target`, you will see the output "This command will always be executed", even if you use the "-n" option.
The "force" command, on the other hand, is used to force a rule to be executed, even if its dependencies are up to date. For example:
```
.PHONY: target
target:
force
echo "This command will always be executed"
```
If you run `make target`, the "force" command will cause the following command to be executed, even if the dependencies of the rule are up to date.
Note that the "force" command is not a built-in command in Makefile. It is a target name that is defined as a phony target, which means that it doesn't correspond to an actual file.
${LDS_FILE} what is the difference between { and ( in makefile?
In a Makefile, `{}` and `()` have different meanings.
- `{}` is used for creating a shell command block. This is used when you want to execute multiple commands in a single shell instance. For example:
```
target:
{ \
echo "Command 1"; \
echo "Command 2"; \
}
```
- `()` is used for defining dependencies. This is used when you want to group multiple dependencies together. For example:
```
target: dependency1 (dependency2 dependency3)
commands
```
In this example, `dependency2` and `dependency3` are grouped together using `()`. They are treated as a single dependency, and `commands` will only be executed if all dependencies are up-to-date.