const int ledPin = 3;  
const int ldrPin = A0;  

float w = 0.24873; //weight predicted from linear regression
float b = 149.92551; //bias predicted from linear regression

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  Serial.begin(9600); 
}

void loop() {
  float ldrValue = analogRead(ldrPin);
  float predict = w*ldrValue + b; //predict the LED brightness from the LDR reading
  analogWrite(ledPin, predict);
  delay(100);
}